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  #201  
Old January 13th, 2011, 10:01 AM
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Quote:
Originally Posted by 45_ACP_AUTO View Post
Just watched the Creed Live concert just released on Blu-Ray tonight.
My VTF-15H just hammerd me to death. This sub is so good it's not even funny. I say, If you like Creed, go get this Blu-Ray the sound is unreal. This is by far the best Blu-Ray I have ever heard. Anyone on the fence about the VTF-15H, just buy the damm thing.

Check it out!!!!!!!!
http://www.blu-ray.com/movies/Creed-Live-Blu-ray/14117/

45
The sub is a beast. I love your last line: "Anyone on the fence about the VTF-15H, just buy the damm thing."

after a person gets the 15H they always kick themselves wondering why it took them so long. to order.

I get that poop eating grin every time I fire it up.
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  #202  
Old January 13th, 2011, 1:53 PM
irythros irythros is offline
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I'm not kicking myself on not ordering sooner.
I'm kicking myself on not trying to get it overnighted.

Waiting for it and knowing its coming to you sucks.
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  #203  
Old January 13th, 2011, 1:58 PM
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get the money you saved on shipping and buy a bunch of Bluray discs.....
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  #204  
Old January 13th, 2011, 3:32 PM
45_ACP_AUTO 45_ACP_AUTO is offline
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Quote:
Originally Posted by lradden View Post
The sub is a beast. I love your last line: "Anyone on the fence about the VTF-15H, just buy the damm thing."

after a person gets the 15H they always kick themselves wondering why it took them so long. to order.

I get that poop eating grin every time I fire it up.
Yeah, I work in a hi-fi store, been doing this for 15 years. In my theater I have some Velodyne DD 15'S. I will tell you the VTF-15H is no joke. I was on the fence a long time, so glad I bought it. What a great crowd here at the HSU forums, love this place, especially PETE.!!!!!!!!
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  #205  
Old January 13th, 2011, 4:54 PM
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Wow... Just WOW... I played track 5 of the demo CD, seat back on my chair, closed my eyes and... Man... That was like being high... The bass... The voices, all.... (using the HSU bookshelf too) I almost cry of emotion. Superb. Have no words....
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  #206  
Old January 13th, 2011, 8:03 PM
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Just ordered the 15H.... can't wait for it to arrive!!
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  #207  
Old January 13th, 2011, 9:34 PM
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Damn it!

Got My tracking number...The sub won't be here till the 19th! Damn it! I thought it will be the 18th.
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  #208  
Old January 14th, 2011, 4:07 AM
victorwol victorwol is offline
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Mine arrived 2 days before than what the tracking said it will... So keep your hope high ;-)
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  #209  
Old January 14th, 2011, 9:13 AM
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Mine arrived a day earlier than tracking said it would.
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  #210  
Old January 14th, 2011, 12:46 PM
monkuboy monkuboy is offline
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Off topic, sort of.. but, where's Pete???
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  #211  
Old January 14th, 2011, 12:57 PM
45_ACP_AUTO 45_ACP_AUTO is offline
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Off topic, sort of.. but, where's Pete???
Not to sure, I think we may have to send the audio police to find him.
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  #212  
Old January 14th, 2011, 1:35 PM
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Off topic, sort of.. but, where's Pete???
Considering how my subs they are selling he could be helping out on the loading dock
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  #213  
Old January 14th, 2011, 2:16 PM
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Considering how my subs they are selling he could be helping out on the loading dock
I know he's around enough to answer my semi daily emails
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  #214  
Old January 15th, 2011, 11:10 AM
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vtf15h sale

hey i am selling my vtf15-h pickup only brand new
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  #215  
Old January 15th, 2011, 2:12 PM
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hey i am selling my vtf15-h pickup only brand new
How much?
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  #216  
Old January 15th, 2011, 4:27 PM
45_ACP_AUTO 45_ACP_AUTO is offline
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hey i am selling my vtf15-h pickup only brand new
How come???
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  #217  
Old January 15th, 2011, 4:28 PM
45_ACP_AUTO 45_ACP_AUTO is offline
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I would not trade mine for anything, I love it.
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  #218  
Old January 15th, 2011, 4:44 PM
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How much?
I believe he posted $950 picked up over on the AVSforum.
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  #219  
Old January 15th, 2011, 5:19 PM
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That's a bit steep considering I can get one new from Hsu for $879.
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  #220  
Old January 15th, 2011, 9:36 PM
newyork newyork is offline
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if i get 900 i take it pickup it is new
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  #221  
Old January 16th, 2011, 8:19 AM
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We need somebody to weed out the spammers.
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  #222  
Old January 16th, 2011, 9:12 AM
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i am not a spammer ok i just looking for someone who wants to buy it u dont believe i have one my wife say it is too large because we are moving to another apt actually a studio but at our current apt she is ok with it but it is one of the best sub i own
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  #223  
Old January 16th, 2011, 10:52 AM
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I didn't say you
The idiot that posted 5 of the same bs messages above you.
Geez. make that 2 idiots Dremifessmal and Aldaheringtono.
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  #224  
Old January 16th, 2011, 11:49 AM
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Originally Posted by newyork View Post
if i get 900 Ii take it pickup it is new
$900????? I can get it new from Hsu for $879. IMO no one is going to give you $900 for a $879 sub that you've taken delivery of. You'd have to come down to about $800 for someone to be interested.
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  #225  
Old January 16th, 2011, 12:02 PM
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Originally Posted by lradden View Post
$900????? I can get it new from Hsu for $879. IMO no one is going to give you $900 for a $879 sub that you've taken delivery of. You'd have to come down to about $800 for someone to be interested.
Maybe it's in Rosenut? but yah, I can buy one from HSU for that price.
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  #226  
Old January 16th, 2011, 2:19 PM
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Wonder why he doesn't send it back if he doesn't want it?
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  #227  
Old January 16th, 2011, 2:58 PM
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Wonder why he doesn't send it back if he doesn't want it?
Beats me. I think mentioned he didn't want to pay the shipping.
I think he's trying to get 100 percent of his money back.
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  #228  
Old January 16th, 2011, 5:47 PM
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ok if i get 800 n pick up i do it
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  #229  
Old January 16th, 2011, 5:52 PM
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Where in NY are you? I just need to know how far you are from me.
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  #230  
Old January 16th, 2011, 6:05 PM
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in the bronx zipcode 10458
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  #231  
Old January 17th, 2011, 3:16 AM
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Originally Posted by Sputter View Post
I didn't say you
The idiot that posted 5 of the same bs messages above you.
Geez. make that 2 idiots Dremifessmal and Aldaheringtono.
Report them as such to the moderators...
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  #232  
Old January 17th, 2011, 7:32 AM
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Report them as such to the moderators...
I did and Pete took care of it, as we all know Pete is busy as a one armed paper hanger.
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  #233  
Old January 17th, 2011, 4:25 PM
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so i guess nobody want it it is 800 pickup vtf15h new
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  #234  
Old January 17th, 2011, 7:59 PM
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someone asked me earlier y am i selling the vtf15h my answer is that the wife is not a fan of the large sub in the new apartment we r getting so i had to give it up as she found a new apt so we will be moving soon as sub goes i have owned in the last 4 month are: svs sb13 plus, svs pb12 plus, svs sb12 nsd all 2010 model, klipsch sub12 and now vtf15h which kill all honestly. the sb13 plus was tight as also the vtf15h but keep tripping out on me i mean the amp sledge stuff so when i got the vtf15h i push it to all what the av receiver have and it did not show any sign of pressure/problem whatsoever i give a detail feed back later
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  #235  
Old January 17th, 2011, 11:38 PM
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Upgraded from ED A5-350 to 15H

Hey Fellas,
Thought I'd throw up a quick review of my 15H that arrived on Thursday. Spent Thursday evening getting it dialed in and experimenting with different EQ options. And it's now ready to go. So rather than bury the lead I'll just say that my initial reaction after throwing in War of the Worlds and Transformers was the same as Bridget Jones when she realizes that she's the only one dressed for the Tarts and Vicars party: "Oh...Holy...Jesus!" !!!
For full disclosure, I migrated from an Elemental Designs A5-350 that I had had for about 2 ˝ years. It was the first A5 with the downward firing driver (they are now forward firing). I really liked the A5 and initially the only reason I thought of upgrading was to get a different finish from the one I had the A5 which was that same stuff that people put in the bed of their trucks to protect them. And my wife said can we get something nicer? Oh yeah! But what sold me on the Hsu was the driver. To get an equivalent driver from ED I would have had to spend about $300 more and the finish wouldn’t have been as nice.
My initial impressions were as follows:
I have to agree with “45_ACP_AUTO” who said that he was a little bit disappointed in the cabinet; as was I compared with the A5. When you knocked on any part of the A5 it was as dead as a concrete block. Absolutely inert. The 15H is still a good cabinet but when you knock on the top middle of the cabinet you get a slight bit of hollow that wasn’t there with the A5. Having said that, when you play the 15H – I heard no resonance whatsoever that said this was a less than stellar cabinet.
The finish is excellent and looks brilliant in my living room. I have to say as well, that Elemental Designs could learn a lesson or two from Hsu on how to package their subs. The ED came in a box with corner pads and that was it. I remember I was shocked that nothing had happened to it. The Hsu was double boxed and the sub itself was double padded and had foam padding in all corners and along the edges.
The sound is something to behold – My A5 was a tight, deep sub that could really rock the house but there were many times that I felt that it had one or two frequency points were it was outstanding and other areas where it fell a little short. The 15H’s had the ability to be more overall deep, smooth, and loud and focused. It has a presence that is significantly more noticeable and really completes the package of the rest of my system. I am really impressed with the amplifier – and here’s why – both my A5 and the 15H had 350 watt amps – so in theory should have performed somewhat similarly. However, when I calibrated my A5 with my new Pioneer 1120K receiver, I had the volume knob on the A5 at about the 12:30 position and the Pioneer backed off the volume to about -6 db to match the other speakers. When I calibrated the 15H – I originally had the volume on it set to about the 11:30 position and the Pioneer backed off the volume by -12 db and I discovered that that was because it couldn’t go any lower. I turned the volume on the 15H down to the 10:00 position and the Pioneer backed it off to -6 db. So clearly the 15H’s amp had significantly more oomph.
I just played the (lengthy) final battle scene from Transformers 2 at a significant volume level and all I can say is WOW! It was like hearing it for the first time. Room filling, smooth deep bass that just keeps on giving. I can say that if you are considering this sub – you will not be disappointed. For reference purposes my room is 3200 cubic feet. I have the new Pioneer receiver as mentioned, I have Aperion Audio speakers all around, Sony BDP-S570 Blu Ray player and Panasonic 58” Plasma TV. Also, I have both ports unplugged.
-Karl
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  #236  
Old January 18th, 2011, 9:24 AM
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Quote:
Originally Posted by newyork View Post
someone asked me earlier y am i selling the vtf15h my answer is that the wife is not a fan of the large sub in the new apartment we r getting so i had to give it up as she found a new apt so we will be moving soon as sub goes i have owned in the last 4 month are: svs sb13 plus, svs pb12 plus, svs sb12 nsd all 2010 model, klipsch sub12 and now vtf15h which kill all honestly. the sb13 plus was tight as also the vtf15h but keep tripping out on me i mean the amp sledge stuff so when i got the vtf15h i push it to all what the av receiver have and it did not show any sign of pressure/problem whatsoever i give a detail feed back later
Actually I was interested in your VTF-15H for $800, but I thought it was new in the box. From your post it sounds like you've opened the box and have been using it.
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  #237  
Old January 18th, 2011, 8:57 PM
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i think i am going to keep it
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  #238  
Old January 19th, 2011, 9:09 AM
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You won't be disappointed. It's a great sub.
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  #239  
Old January 19th, 2011, 9:36 AM
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Originally Posted by 45_ACP_AUTO View Post
Yeah, I work in a hi-fi store, been doing this for 15 years. In my theater I have some Velodyne DD 15'S. I will tell you the VTF-15H is no joke. I was on the fence a long time, so glad I bought it. What a great crowd here at the HSU forums, love this place, especially PETE.!!!!!!!!

Hi, what store do you work for? I'm in Chicago also. I haven't been on this forum much lately but my interest in this sub has been peaked. Do you have your sub at work or home?
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  #240  
Old January 19th, 2011, 7:58 PM
jshar85 jshar85 is offline
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Got My VTF-15H!!!

I received My 15H (Glad I went with the Rosenut) today at 2:15pm and had to help the FedEx guy bring the sub in...luckily the sub wasn't damaged considering how beat up the packaging was. Sub is huge and was very difficult to get down into my basement especially since I had to do it alone...I haven't had much time to play around with the settings yet but so far I like it 1 or 2 ports, Vol at abt 9 oclock, phase 0, EQ switch Down, Q a lil under 0.5, Crossover Frequency controlled through receiver set at 80 and 0 on the sub dial, Crossover set to OUT.....I would appreciate any suggestions for some settings to try out, more suggestions the better...

Also is there any1 that is using a y adapter on the sub input jacks and how is it working out for them???
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  #241  
Old January 20th, 2011, 8:43 AM
45_ACP_AUTO 45_ACP_AUTO is offline
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Quote:
Originally Posted by jbug View Post
Hi, what store do you work for? I'm in Chicago also. I haven't been on this forum much lately but my interest in this sub has been peaked. Do you have your sub at work or home?
WWW.THELITTLEGUYS.COM

I use the sub in my bedroom system.
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  #242  
Old January 20th, 2011, 7:04 PM
jshar85 jshar85 is offline
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Recommend sum settings for the VTF-15H...

I have been tweeking around with the 15H but I still think I can do better with sum time... Please post sum settings tht have worked for U.... Thx.
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  #243  
Old January 20th, 2011, 9:42 PM
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Originally Posted by jshar85 View Post
I have been tweeking around with the 15H but I still think I can do better with sum time... Please post sum settings tht have worked for U.... Thx.
Try them all, it's a personal preference. Get out your spl meter and make some graphs.
Get a good placement.
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  #244  
Old January 21st, 2011, 11:08 AM
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so.....Why didn't anyone mention this thing is HUGE??? LOL

Just got mine. OMG is it massive!

The more I think about it, it's not really THAT big. I think it just takes getting used to after being accustomed to the wimpy-sized JBL ES sub.
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  #245  
Old January 21st, 2011, 12:20 PM
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Originally Posted by rwjr View Post
so.....Why didn't anyone mention this thing is HUGE??? LOL

Just got mine. OMG is it massive!

The more I think about it, it's not really THAT big. I think it just takes getting used to after being accustomed to the wimpy-sized JBL ES sub.
It's a pretty good size.
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  #246  
Old January 21st, 2011, 6:43 PM
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Thoughts on the STF2???

Hey guys I hav a Klipsch SW-450 in My loft area which I need to replace... It's not a big room so Im thinking the STF2 shuld b more thn enough for it... The SW is more thn enuff for this room also so the only reason Im evn considering getting te STF2 is bcuz I wuld like a more musical sub, much tighter and deeper bass. I would jus like some thoughts on which sub will have more output and any other thoughts on it compared to the SW..?

Sorry but I jus realized I posted this under the VTF-15H threads...
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  #247  
Old January 23rd, 2011, 4:48 PM
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Originally Posted by jshar85 View Post
I have been tweeking around with the 15H but I still think I can do better with sum time... Please post sum settings tht have worked for U.... Thx.
I've tried a bunch of setting and EQ-ed all the ones I tried. Too me and in my room my favorite combinations are :

1) 2 ports open, Q=05, EQ2
2) 1 port open, Q=0.5, EQ1

EQ-ed they both have the same mid bass which is really strong and option #2 is EQ-ed flat to just below 12Hz in my room.

Since option 1 and 2 have the same mid bass when EQ-ed and option 2 has the really low extension and a lot more of a tactile feeling compared to option 1, so I leave the 15H set to option 2(1 port open, Q=0.5, EQ1).
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  #248  
Old January 23rd, 2011, 11:41 PM
jshar85 jshar85 is offline
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Talking

Quote:
Originally Posted by lradden View Post
I've tried a bunch of setting and EQ-ed all the ones I tried. Too me and in my room my favorite combinations are :

1) 2 ports open, Q=05, EQ2
2) 1 port open, Q=0.5, EQ1

EQ-ed they both have the same mid bass which is really strong and option #2 is EQ-ed flat to just below 12Hz in my room.

Since option 1 and 2 have the same mid bass when EQ-ed and option 2 has the really low extension and a lot more of a tactile feeling compared to option 1, so I leave the 15H set to option 2(1 port open, Q=0.5, EQ1).
Thanx for the settings... I actually hav tried both of these combinations and for Me the best option seems to b two ports open Q @ 0.3, EQ 2, Xover at 80, and vol. Dial at abt 10:30 position... How far Do U hav Ur gain upto?... I can't believe Ur using the 15H in for Ur bedroom HTS setup... My whole basement is shaking two all three levels of My house and U hav it in Ur bedroom. Damn!
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  #249  
Old January 24th, 2011, 7:33 AM
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Quote:
Originally Posted by lradden View Post
I've tried a bunch of setting and EQ-ed all the ones I tried. Too me and in my room my favorite combinations are :

1) 2 ports open, Q=05, EQ2
2) 1 port open, Q=0.5, EQ1

EQ-ed they both have the same mid bass which is really strong and option #2 is EQ-ed flat to just below 12Hz in my room.

Since option 1 and 2 have the same mid bass when EQ-ed and option 2 has the really low extension and a lot more of a tactile feeling compared to option 1, so I leave the 15H set to option 2(1 port open, Q=0.5, EQ1).
I bounce between Sealed and one port open EQ1/Q.05. One port open will give the deepest response. There is something about sealed that I really like. (i can't put my finger on why). It does make me wonder just how the Sealed 15 sounds.

With some work with my SMS-1 i've gotten excellant results and I have a fairly large space for the 15H to fill. (another is a good possibilty)
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  #250  
Old January 24th, 2011, 8:40 AM
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Originally Posted by jshar85 View Post
Thanx for the settings... I actually hav tried both of these combinations and for Me the best option seems to b two ports open Q @ 0.3, EQ 2, Xover at 80, and vol. Dial at abt 10:30 position... How far Do U hav Ur gain upto?... I can't believe Ur using the 15H in for Ur bedroom HTS setup... My whole basement is shaking two all three levels of My house and U hav it in Ur bedroom. Damn!
Actually it's not in my bedroom it's in our 13x24 sealed theater. I have it about 12' from the listening position right next to the projection screen. I have the dial at 10:00 and the receivers subwoofer level has a range of -12 to +12 with the sub set at -3.

I really have a hard time choosing between 2 ports open EQ2 (can't use EQ1 with two ports open) and 1 port closed EQ1. With movies that really dig deep I really like the 1port open EQ1 setting. I get more rumbling even when there isn't a lot of audible bass. With 2 ports open its still there but not as much.
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Old January 24th, 2011, 8:41 AM
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I bounce between Sealed and one port open EQ1/Q.05. One port open will give the deepest response. There is something about sealed that I really like. (i can't put my finger on why). It does make me wonder just how the Sealed 15 sounds.

With some work with my SMS-1 i've gotten excellant results and I have a fairly large space for the 15H to fill. (another is a good possibilty)
Hey sputter I'm still using the BFD, but will be setting up the SMS-1 either tonight or tomorrow. I'll probably be bugging you for advice.

BTW, I still haven't tried the sub sealed yet. I'll have to give that a try tonight. Sounds like you like it a lot.
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Old January 24th, 2011, 10:14 AM
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Hey sputter I'm still using the BFD, but will be setting up the SMS-1 either tonight or tomorrow. I'll probably be bugging you for advice.

BTW, I still haven't tried the sub sealed yet. I'll have to give that a try tonight. Sounds like you like it a lot.
If I can help with the sms-1 I will. I think its pretty darn handy.

Jim
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Old January 27th, 2011, 1:57 AM
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Ordering today.

Iam ready to order a VTF-15H today....best way to do it beeing in canada is to call at HSU Pete told me....any canadian ordered it and how much time did it took you to get it?..thx.
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Old January 27th, 2011, 7:50 AM
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Iam ready to order a VTF-15H today....best way to do it beeing in canada is to call at HSU Pete told me....any canadian ordered it and how much time did it took you to get it?..thx.
A week.
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Old January 27th, 2011, 8:11 AM
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A week.
Ok thx Sputter....
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Old January 27th, 2011, 3:17 PM
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Well i ordered it....the waiting game now..lol
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Old January 28th, 2011, 12:14 PM
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I think I am about ready for my second VTF-15H.
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Old January 28th, 2011, 2:58 PM
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I think I am about ready for my second VTF-15H.
Pick me up another while you're at it, k?
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Old January 28th, 2011, 3:50 PM
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I think I am about ready for my second VTF-15H.
I'll take another as well.
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Old January 29th, 2011, 4:34 AM
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Sputter you said 446$ total shipping...in Ontario?...im in Quebec so i guess i can expect the same kind of bill from fedex ?
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Old January 29th, 2011, 11:02 PM
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Talking Duals Vtf15's

Duals are awesome I recommend them guys my Duals vtf15's and my Duals sub12's are rocking my house big time.
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Old January 30th, 2011, 8:17 AM
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I am new to the forum and HSU and wanted to say hello.
I just ordered a vtf-15h friday and am super stoked about getting it(I've been waiting over a year now to order some speakers). I previously owned an SVS NSD/2 which was a huge sub but due to financial difficulties had to sell it a few years back. I just wondered if anyone had any idea how the HSU would compare size wise with the svs I had. Also I ordered a complete 5.0 system from Ascend the 3 CMT 340 se for up front, and the cmt 170 se for the rears, I will be using a pioneer vsx-23thx for my receiver.
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Old January 30th, 2011, 8:35 AM
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Originally Posted by jhenry View Post
I am new to the forum and HSU and wanted to say hello.
I just ordered a vtf-15h friday and am super stoked about getting it(I've been waiting over a year now to order some speakers). I previously owned an SVS NSD/2 which was a huge sub but due to financial difficulties had to sell it a few years back. I just wondered if anyone had any idea how the HSU would compare size wise with the svs I had. Also I ordered a complete 5.0 system from Ascend the 3 CMT 340 se for up front, and the cmt 170 se for the rears, I will be using a pioneer vsx-23thx for my receiver.
Howdy jhenry,

I wish I could tell you, this 15H is pretty darn big though.

Jim
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Old January 30th, 2011, 9:29 AM
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Nuts, we lose one spammer only to get another.
Sputter you do not help the situation by quoting them. Just report them.
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Old January 30th, 2011, 9:51 AM
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Originally Posted by jhenry View Post
I am new to the forum and HSU and wanted to say hello.
I just ordered a vtf-15h friday and am super stoked about getting it(I've been waiting over a year now to order some speakers). I previously owned an SVS NSD/2 which was a huge sub but due to financial difficulties had to sell it a few years back. I just wondered if anyone had any idea how the HSU would compare size wise with the svs I had. Also I ordered a complete 5.0 system from Ascend the 3 CMT 340 se for up front, and the cmt 170 se for the rears, I will be using a pioneer vsx-23thx for my receiver.
the NSD is about the size of a VTF3 MK3 which is big. The 15H is a lot bigger.
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Old January 30th, 2011, 9:55 AM
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Sputter you do not help the situation by quoting them. Just report them.
True, Pete knows we're getting shelled by them. Pete thinks he should have more time next month to hang here a bit more.
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Old January 30th, 2011, 10:09 AM
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Regarding the VTF-15h: I have a question regarding performance vs. flexibility vs. etc...
Let me start with knowing that the lowest frequencies will be better reproduced by the VTF-15h, but if I have the ability to get say a VTF-2 or 3 and a MBM, would that be a more flexible solution (being able to place the MBM near-field and the sub at a distance) or is the performance of the VTF-15h simply that much better overall?
I'm talking about a 2400 cuft room for my particular case.
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Old January 30th, 2011, 10:12 AM
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I've also been wondering if we can expect to see a VTF-12h/10h in the 15h style?
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Old January 30th, 2011, 11:36 AM
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the NSD is about the size of a VTF3 MK3 which is big. The 15H is a lot bigger.
Thanks, can't wait to see the beast in person!
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Old February 1st, 2011, 9:45 PM
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Just got my 2 BEASTS

I ordered 2 of the rosenut vtf's a few weeks ago when visiting Hawaii.The sales people at HSU were awsome.My credit card compamy was all screwed up after I called them and said I was ordering these from Hawaii and sending them to North Dakota.I live in Canada so they were confused for some reason.HSU communicated with me and I was able to get it straightened out.Great job HSU.
-I think both my wife and I need a Chiropractor after getting them downstair tonight.LOL These things are heavy & huge.Hopefully I will get a chance to try them tomorrow.
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Old February 3rd, 2011, 8:32 AM
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i should get mine today and i would like to ear and see what Pete thinks of the audioholic review?...
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Old February 3rd, 2011, 10:10 AM
Pete_Hsu Pete_Hsu is offline
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I will be commenting on that today, stay tuned...
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Old February 3rd, 2011, 6:06 PM
Pete_Hsu Pete_Hsu is offline
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Dear all,

I know you guys are eagerly awaiting our response to the latest VTF-15H review. I would first like to thank the people at AH for their time and efforts. It is no easy task to conduct something like this. Now, please allow me to interpret some of the results.

The first thing to note is that the VTF-15H frequency response linearity is second to none, even compared to the DSP and Servo subs. At increasing sweep levels, the VTF-15H is largely able to preserve it's frequency response shape, while the DSP and Servo subs are not able to do this. The VTF-15H overload behavior at extreme output levels is also very good, much better than the Servo sub, and equally good as the DSP sub. Also, the VTF-15H has less output compression at increasing sweep levels compared to the DSP and Servo subs. Note that when increasing sweep level by 10dB at 80Hz on the VTF-15H, the output at 20Hz increases by 8dB. On the Servo sub, when increasing sweep level by 12dB at 80Hz, the output at 20Hz increases by only 4dB. So even though the VTF-15H may not have the most max output at any given frequency using a single frequency tone burst, the real world max output capability may be quite a bit better on the VTF-15H.

Next, let's talk about the low frequency response itself. The physical port tuning on VTF-15H with both ports open is 22Hz. When we conducted our own frequency response measurements with VTF-15H enclosure upright, measured outside with both ports open and Q = 0.7, the frequency response was +/- 2dB from 20-200Hz (ie. only 4dB down at 20Hz relative to higher frequencies). The lower level frequency response rolloff shown was puzzling. We had to think back to something very interesting that we noticed during the development of the VTF-15H. We had two different prototypes, one with round ports and one with triangular ports. These two prototypes were virtually identical in all areas other than one prototype having round ports and the other prototype having triangular ports. What we noticed is that, with the enclosure turned on it's side and both ports open, the prototype with triangular ports had a much more rolled off low frequency response compared to the prototype with round ports. But with the enclosure turned on it’s side and only one port open, the frequency response was virtually identical between the two prototypes. So our conclusion was that the unique geometry of the triangular ports made it very difficult to measure with both ports open with the enclosure turned on it's side, because the top port would be contributing relatively little compared to the bottom port. With the triangular ports, the centroid of each port is pushed very close to each edge of the enclosure. When measuring with two ports open, with two identical ports, there is always an equal amount of air flowing from each port. With the enclosure on it's side, the top port centroid ends up being much farther away from the microphone than the bottom port centroid, so there is an anomaly in the measurement due to lack of proper port contribution from the top port. This is not an issue when measuring with the enclosure upright, as each port is equidistant from the microphone. So this could help to explain some of the rolloff behavior at lower sweep levels.

Regarding the CEA2010 output, the maximum peak output that we measured was a significant 2-3dB more at all frequencies from 25-63Hz, and 4dB more at 20Hz. It’s hard to say what would cause such a large discrepancy. Was there a fudge factor incorporated into the VTF-15H measurements so that what we see is actually max RMS output rather than max peak output (it is my understanding that there was a 3dB fudge factor included in the VTF-15H measurements, so that would make the measurement max RMS output rather than the stated max peak output)?. Was there an averaging technique used to determine max SPL at each frequency (it is my understanding that an averaging technique was used, and this helped some subwoofers but did not help the VTF-15H)? Was there any difference due to the triangular port geometry where the top port centroid is pushed far away from the mic compared to round port geometry? Was there any issue due to different measurement sessions, calibration, etc. from one measurement session to another? Why were the stepped harmonic distortion limits not reached with the 20Hz test tone when this unit is supposed to be excursion limited at that frequency? I don’t know the answers to these questions. We do plan to have a measurement session in the near future at a park to examine differences in max clean output when measuring these subwoofers upright vs. on the side, with and without any averaging techniques. We hope to invite members of the SoCal HT group for that session too. At the end of the day, it’s nice to look at max clean output capability at any one frequency, and you all know that we believe in CEA2010 standard, but we also need to recognize that this won’t tell us about frequency response linearity nor overload behavior nor performance with multiple frequencies playing at the same time.

One interesting thing that I did note regarding the CEA2010 Signal Spectrum charts showing the stepped harmonic distortion limits is that the mix of harmonic distortion on the VTF-15H was very favorable. At most of the test frequencies, 2nd order harmonic distortion was relatively high or equal compared to 3rd order harmonic distortion. On the Servo sub, at 20/25/31.5/63Hz test tones, 3rd order harmonic distortion dominated 2nd order harmonic distortion. Odd order harmonic distortion tends to be more objectionable than even order harmonic distortion.

With respect to sound quality of the subwoofer, we completely stand by the sound quality of the VTF-15H, even compared to DSP and Servo subs. The sound quality of a subwoofer will largely depend on choosing the right operating mode and Q control settings to match one’s listening preferences in their room. The VTF-15H offers more operating mode flexibility than the DSP and Servo subs, with support for five different ported and sealed operating modes, in addition to a continuously adjustable Q control. Not only this, but the VTF-15H is the only variable tuning subwoofer here where one can adjust operating modes without removing the front grille, so there is ease of use in addition to flexibility. I suspect that the reviewer had a preference for an overdamped response and very extended response in the middle of the room where the subwoofer was placed, so one port plugged with a low Q setting would have been ideal. Note that adjusting the Q control from max to min position should make a significant difference with various program material (though not necessarily all program material), since the low frequency response changes by at least 3dB at some frequencies.

We have had quite a few VTF-15H customers who have previously listened to high end subwoofers from JL Audio, Velodyne, Paradigm, Rythmik, SVS, etc. and I am proud to say that in each and every case where I have received feedback, these VTF-15H customers have been thrilled with the sound quality and output capability of the VTF-15H.

Finally, let’s move on to the amplifier itself. The BASH amplifier that we are using is a very good amplifier. There is no external heatsink because the entire amp panel itself is actually made out of aluminum and acts as a heatsink. There are also two internal aluminum heatsinks too. The amp is cool to the touch most of the time, has very low power consumption at idle, and has low background noise. The amp controls are conveniently located at the top section of the amplifier. There is a crossover bypass switch so that one can easily make use of higher crossover frequencies through the A/V receiver. The reliability has been incredibly good so far on the VTF-15H amplifier, and this amp has proven to be a very stable platform for us over the years. The performance of the amplifier is also very good. The VTF-15H amplifier can deliver quite a lot of power in short-term bursts. Sure, we could use a more powerful BASH amplifier platform, but why bother when the subwoofer is not amp limited at low frequencies anyway? Sure, we could use a higher excursion driver, but that involves various design tradeoffs too. Using more amp power and higher excursion driver would give us a marketing advantage, and perhaps more max SPL using single frequency test tone bursts, but we may end up with a less balanced result overall with this enclosure design. The VTF-15H design is simply very well balanced.

The VTF-15H is a true subwoofer. In our demo room (close to 4000 ft^3), with both ports open, we are able to achieve a flat response down to 16Hz at very high sweep levels. The customer feedback on VTF-15H has been stellar so far, from both new and prior Hsu customers. Thank you to everyone for all the support.

Sincerely,
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Old February 3rd, 2011, 6:18 PM
serge71 serge71 is offline
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Thx for the great explanations Pete.....i am still waiting to get mine lol....
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Old February 3rd, 2011, 6:24 PM
Pete_Hsu Pete_Hsu is offline
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You are most welcome Serge! And one more question that some people may ask: so why did we ultimately go with the triangular port design? The answer is threefold: 1) The triangular port prototype ended up having much lower port noise at moderate-to-high playback levels vs. the round port prototype; 2) The triangular ports physically brace the largest panels of the enclosure, making for a more solid enclosure; 3) The triangular ports have great aesthetics when viewed in person, and the triangular port prototype with v-shaped grille ended up looking quite a bit nicer to us than the round port prototype with rectangular grille.

Sincerely,
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Old February 3rd, 2011, 9:13 PM
bbruins2 bbruins2 is offline
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Test CD

Was I supposed to get 1 or even maybe 2 test CDs with my purchase of 2 VTF-15H subs?I read something about this somewhere I think.
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Old February 3rd, 2011, 11:46 PM
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Was I supposed to get 1 or even maybe 2 test CDs with my purchase of 2 VTF-15H subs?I read something about this somewhere I think.
Check the packing slip on the outside of the box.
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Old February 4th, 2011, 8:21 AM
bbruins2 bbruins2 is offline
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Check the packing slip on the outside of the box.
Nope,not there.Is that where yours was?Why there?Maybe Pete can answer this.
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Old February 4th, 2011, 11:56 AM
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Excellent explanation Pete.

We just needed to know why it sounds so good in our houses, yet the reviewer said it does not have high 20hz output....That was what puzzled me! The sub is excellent, it is deep, powerful and articulated.

Thanks.
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Old February 4th, 2011, 1:00 PM
RickD1225 RickD1225 is offline
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Excellent explanation Pete.

We just needed to know why it sounds so good in our houses, yet the reviewer said it does not have high 20hz output....That was what puzzled me! The sub is excellent, it is deep, powerful and articulated.

Thanks.
I agree. I have had a 15H for a couple of months and have been using it with REW and a MiniDSP to adjust my in room response. In my room , ~5000 cubic feet, I am getting extension to 15 Hz (-4 dB) using 1 port open, EQ=1, Q=0.7. I have tested all possible combos and this seems to give me the results I want. Guaranteed if you watch a movie like Inception or U571 the bass almost lifts you off the couch. Heck, I'm in trouble with my wife all the time because the unit blows some of her knickknacks off the walls, tables, etc. It sounds incredible. Thanks, Dr Hsu, for such a pleasurable addition to my home theater, I could not be more pleased, especially for such a reasonable price.

Rick
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Old February 4th, 2011, 4:03 PM
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After that review on AudioHolics, I must say, I have lost all respect for there reviews. #1 They only tested the sub with all ports open. #2 the dude said he rushed the test. He said the bass was sloppy? he said the unit did not play low????? Is that dude on frigging crack???? I have owned lots of hi-end subs, THE VTF-15H IS AMOUNG THE BEST OF THE BEST. BTW, anyone worried about that review dont be. The HSU VTF15H is an amazing sub, I will also be adding a second to my system. I would buy the sub and not look back. I am reading everywhere in the audioholics forums that people arent gonna buy the sub now because of that bullshit review. Dont pay attention to that review, just buy the sub, you will love it. God I am pissed at the crummy review, it is so far from the truth.

45
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Old February 4th, 2011, 4:31 PM
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While I guess you can always thank someone for the time that they did put into a review, I think that the Audioholics review was, nicely put, incomplete. If one were not being so nice, I think you could say that it was half-hearted.

I know that Pete (and everyone else) at HSU is being polite and diplomatic towards Audioholics review, but I do know if I worked for HSU, I would (privately) be a little annoyed at it. There were both inconsistencies and what I guess you might call "nitpicks" (like criticizing the range of the on-board crossover) I get the impression that they wanted to keep the configuration of the 15H like the others within the test (to be fair, I guess), but they also chose to not even test the 15H with the other settings, to see if they compensated for where they felt it was lacking.
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Old February 4th, 2011, 4:45 PM
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Hello to all and Pete...Pete i wrote a review on audioholics and what are my impressions....i got it this afternoon and i am MORE then plased!!!!!!!!....its not a professional review and i didnt have time to buy measurment tolls so...but trust me this is by far the best subwoofer i ever had...and i had a lot of them!!....i am clouso over there!...i said things that i regreted over there afetr i read the AH review but now since i heard it for my self i can swear this VTF-15H is the best bang for the buck and yes Paul over there said it in his review...THE BEST BUY in this shootout!....thx.
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  #284  
Old February 5th, 2011, 1:57 PM
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How many dbs the HSU put in the listening session at the lab?

I ask because the reviewer told the SPL numbers on the other two subs, but didn't tell the real world capability on the HSU sub. Was the sub in its upward position on the room, or did he measured it laying on its side?

I wonder why he didnt post the exact SPL...? I am sure the real world SPL impressed this man, but he likes expensive subs, that is all.

The response seen on the graphs does not look like the VTF-15H 22hz tuning...Something happened there. It should be just like the 3.3 22hz tuning.

So the VTF-15H Bash was underpowered but still managed almost the same numbers with only 350w above 30hz. That truly is a bad/not reliable amp, sure...

On the woofer, he said the driver was nothing extraordinary, yet he was surprised at its output. I wonder how can the woofer be a normal driver with little "motor force", with "uncontrolled bass", but nothing they have reviewed for the price surpasses it?

IMO, when a product is a best buy, it sets a market standard. It should not be criticized as much, since there is no other thing to compare it to at the same price.That is what truly makes a product a hands down BEST BUY.
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Last edited by cacihome : February 6th, 2011 at 4:25 AM.
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Old February 5th, 2011, 3:54 PM
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Maybe Hsu needs to advertise more with Audioholics?
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Old February 6th, 2011, 4:37 AM
Sepen Sepen is offline
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Pete,

Did you have the chance to check out the AVS subwoofer forum five subwoofer shootout yet? Excellent!
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Old February 6th, 2011, 8:37 AM
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I just hope they tested the sub with Q@.7...
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  #288  
Old February 6th, 2011, 8:51 AM
45_ACP_AUTO 45_ACP_AUTO is offline
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Thumbs up

Thats much better, every room is diff. The fact is, the HSU sub rocks. It may not be the loudest, but, they said it sounded as good as the almighty Rythmik. Keep in mind people, this is just opinion. I have compaired the VTF15H to a Velodyne DD-15 that I have in my theater and the HSU is better in many ways. Everyone will get diff results in there rooms. Also, there is no such thing as the best, the best is all relative. HSU makes fine products and has by far the best customer service in the buisness. FYI, I was going to buy an Epik Empire, due to not being able to get a hold of anyone they lost my buisness. I called 2-3 times a day for over a week. I called HSU 5-6 times and Pete answerd the phone every time by the 2nd or 3rd ring. That says alot about a company.

Imagine this, problem with a sub and no one to answer your calls???? how pissed off would you be??? I feel overalll there is alot to be said about a company other than max spl!!!!!!!!!!!!!! YES I AM A HSU FAN BOY!!!! but, with good reason. When I got my sub, I had a rear corner dent on the back right side. I made one call to pete, sent a pic and the problem was taken care of right away, NO PROBLEMS AT ALL. I, for one, work in the buisness, this is just outstanding customer service. I will continue to support HSU, and am about ready for my second VTF-15H.

Hats off to HSU.
Ralph h.
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  #289  
Old February 6th, 2011, 9:26 AM
serge71 serge71 is offline
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Quote:
Originally Posted by 45_ACP_AUTO View Post
Thats much better, every room is diff. The fact is, the HSU sub rocks. It may not be the loudest, but, they said it sounded as good as the almighty Rythmik. Keep in mind people, this is just opinion. I have compaired the VTF15H to a Velodyne DD-15 that I have in my theater and the HSU is better in many ways. Everyone will get diff results in there rooms. Also, there is no such thing as the best, the best is all relative. HSU makes fine products and has by far the best customer service in the buisness. FYI, I was going to buy an Epik Empire, due to not being able to get a hold of anyone they lost my buisness. I called 2-3 times a day for over a week. I called HSU 5-6 times and Pete answerd the phone every time by the 2nd or 3rd ring. That says alot about a company.

Imagine this, problem with a sub and no one to answer your calls???? how pissed off would you be??? I feel overalll there is alot to be said about a company other than max spl!!!!!!!!!!!!!! YES I AM A HSU FAN BOY!!!! but, with good reason. When I got my sub, I had a rear corner dent on the back right side. I made one call to pete, sent a pic and the problem was taken care of right away, NO PROBLEMS AT ALL. I, for one, work in the buisness, this is just outstanding customer service. I will continue to support HSU, and am about ready for my second VTF-15H.

Hats off to HSU.
Ralph h.
I agree completly...buying a VTF-15H is the best move i made in a long time regarding my HT setup!.....i am now an HSU fan!!...thx to Pete again.
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  #290  
Old February 6th, 2011, 11:54 AM
monkuboy monkuboy is offline
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Quote:
Originally Posted by 45_ACP_AUTO View Post
Thats much better, every room is diff. The fact is, the HSU sub rocks. It may not be the loudest, but, they said it sounded as good as the almighty Rythmik. Keep in mind people, this is just opinion. I have compaired the VTF15H to a Velodyne DD-15 that I have in my theater and the HSU is better in many ways. Everyone will get diff results in there rooms. Also, there is no such thing as the best, the best is all relative. HSU makes fine products and has by far the best customer service in the buisness. FYI, I was going to buy an Epik Empire, due to not being able to get a hold of anyone they lost my buisness. I called 2-3 times a day for over a week. I called HSU 5-6 times and Pete answerd the phone every time by the 2nd or 3rd ring. That says alot about a company.

Imagine this, problem with a sub and no one to answer your calls???? how pissed off would you be??? I feel overalll there is alot to be said about a company other than max spl!!!!!!!!!!!!!! YES I AM A HSU FAN BOY!!!! but, with good reason. When I got my sub, I had a rear corner dent on the back right side. I made one call to pete, sent a pic and the problem was taken care of right away, NO PROBLEMS AT ALL. I, for one, work in the buisness, this is just outstanding customer service. I will continue to support HSU, and am about ready for my second VTF-15H.

Hats off to HSU.
Ralph h.
Amen. Hsu is a first class company and Pete knows how to take good care of its customers and potential customers.
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  #291  
Old February 6th, 2011, 8:44 PM
Pete_Hsu Pete_Hsu is offline
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Thank you everyone for all the nice words about me, you guys are the best!

Yes, I did read the VTF-15H review from Ethan and Adam, wow what a great review! In addition to the text, apparently there are high res photos and videos available too, although I haven't viewed those yet. I really can't thank them enough. Hope you all get a chance to see it!

Sincerely,
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  #292  
Old February 7th, 2011, 10:38 AM
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cacihome cacihome is offline
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I have one question/observation that I know several people will have/have experienced:

Why is that this is true?(and I have experienced it too)

"We can’t tell you how much fun this sub is to listen to. It was kind of a mystery to us: even though its average max SPL was about 2.8db below the A7s-450, this thing just moved you like no other."

I mean...

I have been giving it several thoughts and the only thing I can come up with is that since the sub has the flattest FR, in real world material when all the freqs are asked to be played at the same time, the VTF-15 actually handles them louder, because all the freqs are having the same priority/loudness and thus plays actually louder? (i guess)

Does this make sense to you people? If this is not me being high or something(HAHAHAH) this effect appears to be very difficult to measure, but it is giving great results in real world performance.

The same thing happens with several of the HSU lineup, since when the VTF-3 MK3 review from craigsub came up, he said that "the sub was pure joy to listen to", and that "it goes beyond the posted numbers"...So apparently all HSU subs in real world material are much powerful felt than others with higher SPL numbers per frequency...

BTW...I didn't had my coffee today...HAHHAA
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  #293  
Old February 7th, 2011, 12:13 PM
monkuboy monkuboy is offline
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Quote:
Originally Posted by cacihome View Post
I have one question/observation that I know several people will have/have experienced:

Why is that this is true?(and I have experienced it too)

"We can’t tell you how much fun this sub is to listen to. It was kind of a mystery to us: even though its average max SPL was about 2.8db below the A7s-450, this thing just moved you like no other."

I mean...

I have been giving it several thoughts and the only thing I can come up with is that since the sub has the flattest FR, in real world material when all the freqs are asked to be played at the same time, the VTF-15 actually handles them louder, because all the freqs are having the same priority/loudness and thus plays actually louder? (i guess)

Does this make sense to you people? If this is not me being high or something(HAHAHAH) this effect appears to be very difficult to measure, but it is giving great results in real world performance.

The same thing happens with several of the HSU lineup, since when the VTF-3 MK3 review from craigsub came up, he said that "the sub was pure joy to listen to", and that "it goes beyond the posted numbers"...So apparently all HSU subs in real world material are much powerful felt than others with higher SPL numbers per frequency...

BTW...I didn't have my coffee today...HAHHAA
I think part of it is that Hsu is boring.. they are not out to be a celebrity subwoofer or participate in popularity contests. They are solid, dependable and well-engineered products but there's no "flash" to them. Other subs act like they want to be on American Idol or are like Christine Aguilera singing the national anthem at the Super Bowl - all they want to do is bring attention to themselves. Hsu is the classiest of the companies.
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  #294  
Old February 7th, 2011, 12:35 PM
SeattleDucks SeattleDucks is offline
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Pete, can the feet be removed? Would that leave holes that need to be filled?

I would be placing the subs on isolation platforms under my screen and need to reduce the height by taking off the feet because the vertical space available is tight. I realize I could lay the subs on their side but prefer the look upright.

Thanks,
Ross
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  #295  
Old February 7th, 2011, 1:08 PM
rwjr rwjr is offline
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Originally Posted by SeattleDucks View Post
Pete, can the feet be removed? Would that leave holes that need to be filled?

I would be placing the subs on isolation platforms under my screen and need to reduce the height by taking off the feet because the vertical space available is tight. I realize I could lay the subs on their side but prefer the look upright.

Thanks,
Ross
Mine came without the feet attached. there are threaded inserts on the bottom of the cabinet, but they are blind holes, so no, you wouldn't need to plug them.
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  #296  
Old February 7th, 2011, 1:11 PM
rwjr rwjr is offline
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Originally Posted by bbruins2 View Post
Nope,not there.Is that where yours was?Why there?Maybe Pete can answer this.
Hmm.

I think the CD is packaged after-the-fact. That would explain why it was in the packing slip instead of in the box.
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  #297  
Old February 7th, 2011, 1:28 PM
SeattleDucks SeattleDucks is offline
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Quote:
Originally Posted by rwjr View Post
Mine came without the feet attached. there are threaded inserts on the bottom of the cabinet, but they are blind holes, so no, you wouldn't need to plug them.
That's great news, thank you.
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  #298  
Old February 7th, 2011, 1:53 PM
BryanS BryanS is offline
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Quote:
Originally Posted by cacihome View Post
I have one question/observation that I know several people will have/have experienced:

Why is that this is true?(and I have experienced it too)

"We can’t tell you how much fun this sub is to listen to.
...

Maybe it's the lack of buyer's remorse because you're getting a great value?
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  #299  
Old February 7th, 2011, 2:30 PM
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I found this interesting.

Quote:





Originally Posted by Rythmik http://images.avsforum.com/avs-image...s/viewpost.gif

I believe Ethan and Adam set it to 14/low. They
basically looked at the FR curves on our FV15 product page and get a lot of
information on how to set it for the test. I was a bit nervous that they may use
the wrong setting. But their reply was the instruction was very clear. As you
can see that curve has also quite a bit of correlation to what Ethan/Adam got.
The same thing goes to AH shootout. I did send email to Gene beforehand to set
it to 14hz/low as that will give us the flattest extension. That AH curve is
almost a replicate of what we had measured. There are more than one ways to get
the FR curves and they should all correlate very
well.



(my response)
That's curious, I wonder if any of
the other Sub manufactures were able to have thier subs setup for the flattest
extention?







Quote:
Originally Posted by Pete_Hsu View Post
Dear all,

I know you guys are eagerly awaiting our response to the latest VTF-15H review. I would first like to thank the people at AH for their time and efforts. It is no easy task to conduct something like this. Now, please allow me to interpret some of the results.

The first thing to note is that the VTF-15H frequency response linearity is second to none, even compared to the DSP and Servo subs. At increasing sweep levels, the VTF-15H is largely able to preserve it's frequency response shape, while the DSP and Servo subs are not able to do this. The VTF-15H overload behavior at extreme output levels is also very good, much better than the Servo sub, and equally good as the DSP sub. Also, the VTF-15H has less output compression at increasing sweep levels compared to the DSP and Servo subs. Note that when increasing sweep level by 10dB at 80Hz on the VTF-15H, the output at 20Hz increases by 8dB. On the Servo sub, when increasing sweep level by 12dB at 80Hz, the output at 20Hz increases by only 4dB. So even though the VTF-15H may not have the most max output at any given frequency using a single frequency tone burst, the real world max output capability may be quite a bit better on the VTF-15H.

Next, let's talk about the low frequency response itself. The physical port tuning on VTF-15H with both ports open is 22Hz. When we conducted our own frequency response measurements with VTF-15H enclosure upright, measured outside with both ports open and Q = 0.7, the frequency response was +/- 2dB from 20-200Hz (ie. only 4dB down at 20Hz relative to higher frequencies). The lower level frequency response rolloff shown was puzzling. We had to think back to something very interesting that we noticed during the development of the VTF-15H. We had two different prototypes, one with round ports and one with triangular ports. These two prototypes were virtually identical in all areas other than one prototype having round ports and the other prototype having triangular ports. What we noticed is that, with the enclosure turned on it's side and both ports open, the prototype with triangular ports had a much more rolled off low frequency response compared to the prototype with round ports. But with the enclosure turned on it’s side and only one port open, the frequency response was virtually identical between the two prototypes. So our conclusion was that the unique geometry of the triangular ports made it very difficult to measure with both ports open with the enclosure turned on it's side, because the top port would be contributing relatively little compared to the bottom port. With the triangular ports, the centroid of each port is pushed very close to each edge of the enclosure. When measuring with two ports open, with two identical ports, there is always an equal amount of air flowing from each port. With the enclosure on it's side, the top port centroid ends up being much farther away from the microphone than the bottom port centroid, so there is an anomaly in the measurement due to lack of proper port contribution from the top port. This is not an issue when measuring with the enclosure upright, as each port is equidistant from the microphone. So this could help to explain some of the rolloff behavior at lower sweep levels.

Regarding the CEA2010 output, the maximum peak output that we measured was a significant 2-3dB more at all frequencies from 25-63Hz, and 4dB more at 20Hz. It’s hard to say what would cause such a large discrepancy. Was there a fudge factor incorporated into the VTF-15H measurements so that what we see is actually max RMS output rather than max peak output (it is my understanding that there was a 3dB fudge factor included in the VTF-15H measurements, so that would make the measurement max RMS output rather than the stated max peak output)?. Was there an averaging technique used to determine max SPL at each frequency (it is my understanding that an averaging technique was used, and this helped some subwoofers but did not help the VTF-15H)? Was there any difference due to the triangular port geometry where the top port centroid is pushed far away from the mic compared to round port geometry? Was there any issue due to different measurement sessions, calibration, etc. from one measurement session to another? Why were the stepped harmonic distortion limits not reached with the 20Hz test tone when this unit is supposed to be excursion limited at that frequency? I don’t know the answers to these questions. We do plan to have a measurement session in the near future at a park to examine differences in max clean output when measuring these subwoofers upright vs. on the side, with and without any averaging techniques. We hope to invite members of the SoCal HT group for that session too. At the end of the day, it’s nice to look at max clean output capability at any one frequency, and you all know that we believe in CEA2010 standard, but we also need to recognize that this won’t tell us about frequency response linearity nor overload behavior nor performance with multiple frequencies playing at the same time.

One interesting thing that I did note regarding the CEA2010 Signal Spectrum charts showing the stepped harmonic distortion limits is that the mix of harmonic distortion on the VTF-15H was very favorable. At most of the test frequencies, 2nd order harmonic distortion was relatively high or equal compared to 3rd order harmonic distortion. On the Servo sub, at 20/25/31.5/63Hz test tones, 3rd order harmonic distortion dominated 2nd order harmonic distortion. Odd order harmonic distortion tends to be more objectionable than even order harmonic distortion.

With respect to sound quality of the subwoofer, we completely stand by the sound quality of the VTF-15H, even compared to DSP and Servo subs. The sound quality of a subwoofer will largely depend on choosing the right operating mode and Q control settings to match one’s listening preferences in their room. The VTF-15H offers more operating mode flexibility than the DSP and Servo subs, with support for five different ported and sealed operating modes, in addition to a continuously adjustable Q control. Not only this, but the VTF-15H is the only variable tuning subwoofer here where one can adjust operating modes without removing the front grille, so there is ease of use in addition to flexibility. I suspect that the reviewer had a preference for an overdamped response and very extended response in the middle of the room where the subwoofer was placed, so one port plugged with a low Q setting would have been ideal. Note that adjusting the Q control from max to min position should make a significant difference with various program material (though not necessarily all program material), since the low frequency response changes by at least 3dB at some frequencies.

We have had quite a few VTF-15H customers who have previously listened to high end subwoofers from JL Audio, Velodyne, Paradigm, Rythmik, SVS, etc. and I am proud to say that in each and every case where I have received feedback, these VTF-15H customers have been thrilled with the sound quality and output capability of the VTF-15H.

Finally, let’s move on to the amplifier itself. The BASH amplifier that we are using is a very good amplifier. There is no external heatsink because the entire amp panel itself is actually made out of aluminum and acts as a heatsink. There are also two internal aluminum heatsinks too. The amp is cool to the touch most of the time, has very low power consumption at idle, and has low background noise. The amp controls are conveniently located at the top section of the amplifier. There is a crossover bypass switch so that one can easily make use of higher crossover frequencies through the A/V receiver. The reliability has been incredibly good so far on the VTF-15H amplifier, and this amp has proven to be a very stable platform for us over the years. The performance of the amplifier is also very good. The VTF-15H amplifier can deliver quite a lot of power in short-term bursts. Sure, we could use a more powerful BASH amplifier platform, but why bother when the subwoofer is not amp limited at low frequencies anyway? Sure, we could use a higher excursion driver, but that involves various design tradeoffs too. Using more amp power and higher excursion driver would give us a marketing advantage, and perhaps more max SPL using single frequency test tone bursts, but we may end up with a less balanced result overall with this enclosure design. The VTF-15H design is simply very well balanced.

The VTF-15H is a true subwoofer. In our demo room (close to 4000 ft^3), with both ports open, we are able to achieve a flat response down to 16Hz at very high sweep levels. The customer feedback on VTF-15H has been stellar so far, from both new and prior Hsu customers. Thank you to everyone for all the support.

Sincerely,

Last edited by Sputter : February 7th, 2011 at 2:32 PM. Reason: split the Rythmik statement and my response
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  #300  
Old February 7th, 2011, 2:37 PM
Pete_Hsu Pete_Hsu is offline
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Hi Cacimar,

Quote:
Originally Posted by cacihome View Post
I have one question/observation that I know several people will have/have experienced:

Why is that this is true?(and I have experienced it too)

"We can’t tell you how much fun this sub is to listen to. It was kind of a mystery to us: even though its average max SPL was about 2.8db below the A7s-450, this thing just moved you like no other."

I mean...

I have been giving it several thoughts and the only thing I can come up with is that since the sub has the flattest FR, in real world material when all the freqs are asked to be played at the same time, the VTF-15 actually handles them louder, because all the freqs are having the same priority/loudness and thus plays actually louder? (i guess)

Does this make sense to you people? If this is not me being high or something(HAHAHAH) this effect appears to be very difficult to measure, but it is giving great results in real world performance.

The same thing happens with several of the HSU lineup, since when the VTF-3 MK3 review from craigsub came up, he said that "the sub was pure joy to listen to", and that "it goes beyond the posted numbers"...So apparently all HSU subs in real world material are much powerful felt than others with higher SPL numbers per frequency...

BTW...I didn't had my coffee today...HAHHAA
The Radio Shack Sound Level Meter starts to become inaccurate in the lower frequencies (below 35Hz). So when one looks at the max SPL from the meter with any given set of program material, that is mainly capturing max mid-bass SPL and not max deep bass SPL. So it is quite possible that the VTF-15H had the most output from 20-40Hz, which would have been apparent with the subjective tests, but would not have registered on the Sound Level Meter max SPL tests due to the low frequency inaccuracy of the meter itself.

Sincerely,
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  #301  
Old February 7th, 2011, 2:40 PM
Pete_Hsu Pete_Hsu is offline
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Hi Ross,

Quote:
Originally Posted by SeattleDucks View Post
Pete, can the feet be removed? Would that leave holes that need to be filled?

I would be placing the subs on isolation platforms under my screen and need to reduce the height by taking off the feet because the vertical space available is tight. I realize I could lay the subs on their side but prefer the look upright.

Thanks,
Ross
The feet come packaged separately in the accessory kit. It is just fine to use the subwoofer without feet, but to be safe, you may want to put some electrical tape over the threaded insert holes on the bottom back portion of the sub to prevent any air leaking.

Sincerely,
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  #302  
Old February 7th, 2011, 2:45 PM
Pete_Hsu Pete_Hsu is offline
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Hi Jim,

Quote:
Originally Posted by Sputter View Post
(my response)
That's curious, I wonder if any of
the other Sub manufactures were able to have thier subs setup for the flattest
extention?
The flattest extension on the VTF-15H will be had with Q = 0.7 . With one port port plugged or two ports plugged, then we have EQ1 operating mode as an option too.

Sincerely,
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  #303  
Old February 7th, 2011, 4:41 PM
Sputter Sputter is offline
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Quote:
Originally Posted by Pete_Hsu View Post
Hi Jim,



The flattest extension on the VTF-15H will be had with Q = 0.7 . With one port port plugged or two ports plugged, then we have EQ1 operating mode as an option too.

Sincerely,
I knew that. I was just pointing out that Rythmik requested Gene to adjust their sub to go flat. Where the 15H was used both ports open.
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  #304  
Old February 7th, 2011, 5:25 PM
Pete_Hsu Pete_Hsu is offline
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I'm pretty sure that all the subs were tested with all ports open.
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  #305  
Old February 7th, 2011, 5:54 PM
bbruins2 bbruins2 is offline
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Unhappy

Quote:
Originally Posted by rwjr View Post
Hmm.

I think the CD is packaged after-the-fact. That would explain why it was in the packing slip instead of in the box.
But I never got one.
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  #306  
Old February 7th, 2011, 6:06 PM
Pete_Hsu Pete_Hsu is offline
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We only include those for shipments with final destination in the USA.
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  #307  
Old February 7th, 2011, 6:26 PM
drgn95 drgn95 is offline
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Smile

Pete: As I see your online I wanted to say thanks for such a great product, the VTF-15H I received last week. I'm glad your getting positive reactions from various reviews etc. I'm completely happy with mine even though some more adjustments are needed. As a matter of fact even though space is limited I'm pondering a 2nd one. What a great sub....
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  #308  
Old February 7th, 2011, 6:34 PM
Pete_Hsu Pete_Hsu is offline
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Thank you so much drgn, it's so gratifying to hear this after all the hard work that went into the design! Feel free to post pictures and further impressions whenever you get a chance We'd love to know what operating mode and Q control settings work best for you.

Sincerely,
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  #309  
Old February 7th, 2011, 6:46 PM
bbruins2 bbruins2 is offline
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Quote:
Originally Posted by Pete_Hsu View Post
We only include those for shipments with final destination in the USA.
I am a bit confused.(by the way I love these subs so far and my wife loves the look of the rosenut)You sent these 2 subs to North Dakota and I brought them home to Canada.What is the rationale for USA "final" destination only.As a last resort will you sell me one if it is worth it?
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  #310  
Old February 7th, 2011, 10:22 PM
Pete_Hsu Pete_Hsu is offline
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It has something to do with the agreement with the BAS (Boston Audio Society), that's all I know about it.

Is there anyone here in the USA who can make some mp3's of the tracks and make them available online?

Thanks
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  #311  
Old February 8th, 2011, 12:12 AM
shadyJ shadyJ is offline
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The Hsu CD can be downloaded here.
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  #312  
Old February 8th, 2011, 12:23 AM
Pete_Hsu Pete_Hsu is offline
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You are the man shadyJ, thank you so much!

Sincerely,
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  #313  
Old February 8th, 2011, 5:49 PM
ROBERT760 ROBERT760 is offline
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vtf15

Hey Pete just put a you tube video on my dual vtf15 they sound deep check it out just type in dual vtf15
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  #314  
Old February 8th, 2011, 5:56 PM
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The Hsu CD can be downloaded here.
Thanks shadyj & Pete.I just downloaded it and burned it.I will try it tommorrow.
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Old February 8th, 2011, 7:01 PM
Pete_Hsu Pete_Hsu is offline
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Hey Pete just put a you tube video on my dual vtf15 they sound deep check it out just type in dual vtf15
Very nice Robert, wow, your setup looks great!

Here is the video for those who haven't seen it: http://www.youtube.com/watch?v=_t7OL221udA
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Old February 9th, 2011, 6:51 AM
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The Hsu CD can be downloaded here.
Thanks buddy. Very nice of you.

Anyone have a description of each of the track what is the frequency or usage?
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Old February 9th, 2011, 7:36 AM
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Thanks buddy. Very nice of you.

Anyone have a description of each of the track what is the frequency or usage?
http://forum.hsuresearch.com/showpos...68&postcount=2
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  #318  
Old February 9th, 2011, 5:01 PM
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Hey Pete just put a you tube video on my dual vtf15 they sound deep check it out just type in dual vtf15
Hey Robert, that looks really good dude. Try to make a longer video and show your entire system. Do you have two other subs at your back wall? Thats what it looks like, and if so...why? Those two VTF's should be bending your walls.
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Old February 9th, 2011, 5:56 PM
ROBERT760 ROBERT760 is offline
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dual vtf15

Ya next video I will do the whole system . Yup I got for subs the other 2 are sub 12 from klipsch more bass the better I love bass!
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  #320  
Old February 11th, 2011, 8:23 AM
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Congrats to HSU Research for the amazing job done on the VTF-15H.
As S&V say, it is truly certified and recommended!
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Old February 11th, 2011, 8:31 AM
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Congrats to HSU Research for the amazing job done on the VTF-15H.
As S&V say, it is truly certified and recommended!
I'm enjoying mine enough that a 2nd one is high on my todo list. My room size is roughly 4100cu ft so another won't hurt me.
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  #322  
Old February 11th, 2011, 8:46 AM
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"To sum it up, the listener will distort (i.e., throbbing head, aching eardrums, bruises inflicted by aggrieved cohabitants) before the VTF-15H does. In terms of sheer output, it's the most capable subwoofer I've tested. If the VTF-15H can't shake your couch, your name must be Fred Flintstone."

WOW!

To put things in perspective, this is the same reviewer which conducted a shootout where the PB-12 Plus was apparently the winner or best buy... It got from 20hz-80hz about 108-114.8db, where the VTF got about 123dbs...

This will be seen as a biased comment, but I have to say that I don't think that there is a single 12" product in the market that can offer the real world experience the VTF-15H does, nor I think is possible.

I have said it several times, as I have owned several of the HSU subs, the VTF-15H is the overall most powerful sub I have had in my house. In sheer output felt, it easily surpasses the experience that a VTF-3MK3 Turbo+MBM provides.

Congrats HSU team!
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  #323  
Old February 11th, 2011, 1:27 PM
Pete_Hsu Pete_Hsu is offline
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Hi Caci,

I think those earlier measurements are not comparable because the measurement techniques were different. For instance, if I recall correctly, those old measurements used a 10% THD limit for all frequencies.

That said, you can see from Brent's measurements that the clean output capability and the frequency response are very good! In fact, Brent even mentioned that the VTF-15H has more impact than any other subwoofer he has ever reviewed!

Sincerely,
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Old February 11th, 2011, 2:29 PM
45_ACP_AUTO 45_ACP_AUTO is offline
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Congrats Pete on the steller review over at S&V.
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  #325  
Old February 11th, 2011, 2:34 PM
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Hi Caci,

I think those earlier measurements are not comparable because the measurement techniques were different. For instance, if I recall correctly, those old measurements used a 10% THD limit for all frequencies.

That said, you can see from Brent's measurements that the clean output capability and the frequency response are very good! In fact, Brent even mentioned that the VTF-15H has more impact than any other subwoofer he has ever reviewed!

Sincerely,
Ohhhh.Ok.

Anyway, yep he said that the VTf had the strongest feel so far.
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  #326  
Old February 12th, 2011, 11:08 AM
Pete_Hsu Pete_Hsu is offline
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Congrats Pete on the steller review over at S&V.
Thank you so much Ralph!
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  #327  
Old February 12th, 2011, 11:14 AM
Pete_Hsu Pete_Hsu is offline
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Hi guys,

I just wanted to let you know that we ran some frequency response sweeps yesterday evening outdoors in the back of our facility of the VTF-15H review unit that was tested by Paul (on behalf of Audioholics). I am happy to say that the unit was not defective in any way. In the upright position, both ports open with Q = 0.7, we measured a frequency response that was +/- 2.5dB from 20-200Hz (ie. no more than 5dB down @ 20Hz relative to 50Hz; this would be even flatter if measured in the park). When placed on it's side, the frequency response was down an extra 2dB at 20Hz! The only scenario where we could replicate Paul's measurement of 10dB down at 20Hz was with the unit measured on it's side and Q = 0.3.

Most of the frequency response sweeps we did were at 100dB. What was pretty impressive was that with both ports open and Q = 0.7, even when increasing the sweep level by 10dB to 110dB, we only had at most 1dB of output compression at 20Hz.

On an aside, I did get clarification from Gene that the listening tests of VTF-15H were done without bass management. When listening to this subwoofer in a 2 channel system without bass management and crossover switch set to 'Out', the sound can certainly be boomy because our amplifier does not roll off the upper bass frequencies. The two other units reviewed already have a rolled off upper bass, as can be seen from the frequency response sweeps.

So we still don't know the answers to many questions posed earlier, but we do feel confident that the VTF-15H should be performing to spec. I did email Gene about our findings so far.

Sincerely,
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  #328  
Old February 12th, 2011, 1:15 PM
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Originally Posted by Pete_Hsu View Post
Hi guys,

I just wanted to let you know that we ran some frequency response sweeps yesterday evening outdoors in the back of our facility of the VTF-15H review unit that was tested by Paul (on behalf of Audioholics). I am happy to say that the unit was not defective in any way. In the upright position, both ports open with Q = 0.7, we measured a frequency response that was +/- 2.5dB from 20-200Hz (ie. no more than 5dB down @ 20Hz relative to 50Hz; this would be even flatter if measured in the park). When placed on it's side, the frequency response was down an extra 2dB at 20Hz! The only scenario where we could replicate Paul's measurement of 10dB down at 20Hz was with the unit measured on it's side and Q = 0.3.

Most of the frequency response sweeps we did were at 100dB. What was pretty impressive was that with both ports open and Q = 0.7, even when increasing the sweep level by 10dB to 110dB, we only had at most 1dB of output compression at 20Hz.

On an aside, I did get clarification from Gene that the listening tests of VTF-15H were done without bass management. When listening to this subwoofer in a 2 channel system without bass management and crossover switch set to 'Out', the sound can certainly be boomy because our amplifier does not roll off the upper bass frequencies. The two other units reviewed already have a rolled off upper bass, as can be seen from the frequency response sweeps.

So we still don't know the answers to many questions posed earlier, but we do feel confident that the VTF-15H should be performing to spec. I did email Gene about our findings so far.

Sincerely,
Hey Pete, could you post the graphs for us?

Thanks, Jim
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  #329  
Old February 12th, 2011, 6:48 PM
Pete_Hsu Pete_Hsu is offline
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Sure thing Jim, will do early in the week.

Sincerely,
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  #330  
Old February 14th, 2011, 10:32 PM
Pete_Hsu Pete_Hsu is offline
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Hi guys, I re-read the email that Gene sent to me on Friday, and looks like Paul did say something about using a DSP controller to implement different crossover settings. I read a line in the email that said "I did not use Bass Management..." and then skimmed the rest of the email too quickly, sorry about that!

So with respect to very loud music listening, I can only guess that Paul would have preferred one port open or sealed mode with EQ2 and a low Q control setting.

Sincerely,
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  #331  
Old February 15th, 2011, 4:03 AM
ROBERT760 ROBERT760 is offline
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vtf15

Yesterday I gave my dual vtf15's a Valentines card!!
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  #332  
Old February 15th, 2011, 1:35 PM
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FYI Folks

The new AH review should be posted either late tonight or early tomorrow morning.
It should be a interesting.read.(supposedly 17 pages worth).
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Old February 15th, 2011, 1:40 PM
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Yesterday I gave my dual vtf15's a Valentines card!!
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  #334  
Old February 15th, 2011, 3:10 PM
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Yesterday I gave my dual vtf15's a Valentines card!!
What no movie, no dinner? Man those subs are a cheap date
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Old February 15th, 2011, 4:07 PM
ROBERT760 ROBERT760 is offline
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vtf15

[quote=lradden;101071]What no movie, no dinner? Man those subs are a cheap date[/QUOT
Nope but they put out good SPl last night!!!
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  #336  
Old February 15th, 2011, 4:21 PM
ROBERT760 ROBERT760 is offline
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VTF15

Hi Pete I got Duals vtf15's banging again I figure it out so I'm going to put them in the front again. I like the way they sounded thier.
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Old February 15th, 2011, 5:23 PM
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What no movie, no dinner? Man those subs are a cheap date
Nope but they put out good SPl last night!!!
As long as they put out, that's all that matters
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  #338  
Old February 15th, 2011, 6:37 PM
ROBERT760 ROBERT760 is offline
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As long as they put out, that's all that matters
Yup
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  #339  
Old February 16th, 2011, 3:21 AM
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LOL... too funny...
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  #340  
Old February 16th, 2011, 4:33 AM
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The new AH review should be posted either late tonight or early tomorrow morning.
It should be a interesting.read.(supposedly 17 pages worth).
17 pages in Word= 2 or 3 pages on Audioholics. At least that is what Gene said.
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  #341  
Old February 16th, 2011, 6:12 AM
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Here is the updated review.

http://www.audioholics.com/reviews/s...h-supplemental
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  #342  
Old February 16th, 2011, 8:58 AM
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Well lets see...total of 3 reviews yet?...two stating that the VTF-15H is indestructible and one saying it can self destruct if pushed a lil..lmao....btw Pete can you tell us how many other reviews are coming for the VTF-15H?...and if possible by whom?...thx.
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  #343  
Old February 16th, 2011, 9:49 AM
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Well lets see...total of 3 reviews yet?...two stating that the VTF-15H is indestructible and one saying it can self destruct if pushed a lil..lmao....btw Pete can you tell us how many other reviews are coming for the VTF-15H?...and if possible by whom?...thx.
That's all opinion, I'm not seeing that 30hz rolloff but I do see it after 20hz. (using my sms-1) I don't listen to reference lvls however it handles everything i've watched so far.
I do like the 15H enough to buy a second one.
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  #344  
Old February 16th, 2011, 10:01 AM
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That's all opinion, I'm not seeing that 30hz rolloff but I do see it after 20hz. (using my sms-1) I don't listen to reference lvls however it handles everything i've watched so far.
I do like the 15H enough to buy a second one.
Same here i love it MORE then enough to buy a second one in a near future.....and i do listen at reference volume and this woofer is not even sweating...lol.
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  #345  
Old February 16th, 2011, 11:36 AM
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Sorry but i re- read that second AH review and it sounds to me like they or Paul are having a personal vendetta against HSU?.. i dont want to sound paranoid but am i the only one thinking that?....something i noticed also!....if you can read the emotiva ultra subwoofer review they made they modified it on feb 7th...the original review (and i remember it very well!) stated that the emotiva was a TRUE 20Hz performer and now they just say it can go down to 22 Hz....maybe they realised that made no sense at all comparing to the VTF-15H?!....i still beleive and i mentioned it on AH before getting banned...to my demand btw!..lmao....that they only praise for manufacturers that are advirtising on their site and that must be why some declined the shootout.. some guy on the emotiva sub review thread asked gene...''why arent any readings below 20Hz?''...the answer was....''if you read my comments you will notice there was a lot of windnoise the day i was testing the sub.Any measurements below 20Hz would have been wind related.Considering the sub was already 24db down at 20Hz , any measurements lower would have been pretty meaningless anyway.''...wow what a good and hypocrite way to get out of trouble!...btw the guy who asked this question was also banned or was badly noted...everyone that is reading this pls do your self a favor and dont trust Audioholics not even for a second...they change their minds like they change their ties around the table they all sit around during meetings!....asking them selves...'' well what do we do with this product?..this manufacturer isnt advirtising us right?.''....ppfft...
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  #346  
Old February 16th, 2011, 12:15 PM
Pete_Hsu Pete_Hsu is offline
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I will be commenting on the addendum later tonight (sounds like deja vu, huh?). Stay tuned.

Sincerely,
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  #347  
Old February 17th, 2011, 12:28 AM
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Sorry but i re- read that second AH review and it sounds to me like they or Paul are having a personal vendetta against HSU?.. i dont want to sound paranoid but am i the only one thinking that?....something i noticed also!....if you can read the emotiva ultra subwoofer review they made they modified it on feb 7th...the original review (and i remember it very well!) stated that the emotiva was a TRUE 20Hz performer and now they just say it can go down to 22 Hz....maybe they realised that made no sense at all comparing to the VTF-15H?!....i still beleive and i mentioned it on AH before getting banned...to my demand btw!..lmao....that they only praise for manufacturers that are advirtising on their site and that must be why some declined the shootout.. some guy on the emotiva sub review thread asked gene...''why arent any readings below 20Hz?''...the answer was....''if you read my comments you will notice there was a lot of windnoise the day i was testing the sub.Any measurements below 20Hz would have been wind related.Considering the sub was already 24db down at 20Hz , any measurements lower would have been pretty meaningless anyway.''...wow what a good and hypocrite way to get out of trouble!...btw the guy who asked this question was also banned or was badly noted...everyone that is reading this pls do your self a favor and dont trust Audioholics not even for a second...they change their minds like they change their ties around the table they all sit around during meetings!....asking them selves...'' well what do we do with this product?..this manufacturer isnt advirtising us right?.''....ppfft...
For someone that requested to be removed from the AH community, you still show a lot of interest in what goes on over there.

You and your rag-tag group of fan boys aren't doing a reputable company like HSU any favors within the community with posts like the above.
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  #348  
Old February 17th, 2011, 2:05 AM
Pete_Hsu Pete_Hsu is offline
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Dear all,

Let me start by thanking Audioholics for the time, effort, and expense in getting this all together. I've known Gene for a long time, and he is a good guy. Please allow me to provide some feedback on the addendum.

Let's start with subjective listening impressions. When listening to two channel music with the subwoofer placed in the middle of the room at or near maximum output levels, the VTF-15H with both ports open will have substantially less output compression compared to some of the other subs tested. This may make the sound too deep bass heavy in comparison. During development of the VTF-15H, we noted that a less deep bass heavy sound may be perceived as "tighter" with music, due to accentuation of mid-bass frequencies. So this is one of the reasons why we included support for a wide variety of operating modes (including various ported and sealed modes) in addition to continuously adjustable Q. The VTF-15H has more flexibility in terms of operating modes and adjustable Q vs. any of the other subwoofers tested here. This flexibility makes it practical to get good sound quality, irrespective of room size, playback levels, listening preferences, etc. I'm sure that the VTF-15H would have been perceived as very tight sounding under the previously mentioned listening conditions if using one of the other operating modes.

Regarding measurements with the enclosure on it's side vs. upright, it's a little bit hard to compare Paul's graphs because the Y axis scale has changed from 5dB per major division in the original review to 4dB per major division now. In our own testing with Paul's review unit, we measured a 2dB advantage at 20Hz with the enclosure upright vs. on it's side. This is significant. I personally feel that the most accurate measurement is done with the enclosure in the upright position, for two reasons. One is that each port contributes equally to the deep bass output (which is not the case when the enclosure is on it's side). Two is that the microphone need not be moved when switching from two port open to one port open mode, as the distance from mic to port centroid stays the same for each operating mode (which is not the case when the enclosure is on it's side). The only tradeoff is that the port centroid ends up being about 10% closer to the mic than the center of the driver, but it is a worthwhile tradeoff given the two advantages noted above.

As some of you may know, we measured an outdoor frequency response of +/- 2.5dB from 20-200Hz (ie. 5dB down at 20Hz relative to 50Hz) for Paul's VTF-15H review unit in the upright position with 2 ports open and EQ2. So there is still a 3dB difference between our frequency response measurement vs. Paul's. We really don't know exactly why there is a difference between the two data sets. We may never know. Do note that we have already measured the frequency response of VTF-15H many times, in several different locations, with two different microphones too, and we have always gotten results that are consistent with this +/- 2.5dB range. In the near future we will take very extensive measurements of the VTF-15H at the park which should result in nice ripple free curves that are about as accurate as we can hope for. I am looking forward to providing a wealth of data on the VTF-15H, far more than has ever been provided before.

On to the frequency response sweeps done with 1 port open, operating mode set to 'EQ1', and Q = 0.7. These settings are not recommended for high playback levels. We mention this in the VTF-15H owner's manual on page 5 here: http://www.hsuresearch.com/products/VTF-15HSubmanual.pdf. This operating mode should be used for low-to-moderate levels only, where a rising in-room response may be preferrable due to the lower sensitivity of the ear at increasingly low frequencies at low-to-moderate listening levels. The 'EQ1' operating mode is certainly not for "making great curves for sales", and we don't appreciate that remark. If one wants to listen at high playback levels, it is better to run with operating mode switch set to 'EQ2', whether using 1 port open or 2 ports open. That said, with real world program material, there should be no issues with the woofer reaching it's excursion limits in any of the operating modes, including 1 port open with 'EQ1'. In fact, I have yet to hear from even a single VTF-15H owner who has bottomed out the driver in any of the operating modes. Based on the customer feedback, the overload behavior on this subwoofer has proven to be quite excellent, and the limiters and subsonic filtering appear to be working well.

Next, let's talk about the sealed operating modes. We intentionally aimed for a rolled off (NOT "droopy") low frequency response in the sealed modes. This response shaping works quite well in small-to-moderately sized rooms that are well enclosed and have significant room gain to boost the low end response, and also works quite well for customers who are looking for a less deep bass heavy sound in any given room.

Regarding the BASH amplifier used on the VTF-15H, we are very happy with it, and feel that we achieved a very balanced result for end users. As I have mentioned before, this is a very powerful and high headroom amplifier, runs cool to the touch, has very low noise, and has conveniently located switches and controls. The performance and reliability of the VTF-15H amplifier has been exceptional so far.

As you may know, we released CEA2010 data on maximum clean peak output many months ago. There is a 2-3 dB difference between our max clean peak output measurement vs. Paul's, at all frequencies, with 2 ports open and 1 port open mode. Again, we really don't know why there is a difference between the two data sets, and again, we may never know. In our upcoming measurement session in the park, we will measure max clean output upright vs. on side, 2 port open vs 1 port open, etc. using an SPL calibrator before the measurements are taken in order to take into account any temperature/humidity effects on the day of the measurement.

Having spent countless hours over the last two years measuring the VTF-15H, listening to the VTF-15H, and getting customer feedback and impressions on the VTF-15H, I am quite confident that this subwoofer performs as advertised. In our experience, the maximum output capability is very strong all the way down to 20Hz, the frequency response linearity is exceptionally good with true 20Hz extension (within a +/- 2.5dB window based on our recent measurements), the output compression is very low even at very high sweep levels (in max output and max headroom modes), and the limiters and subsonic filtering seem to work extremely well to keep the unit sounding clean with real world program material. The customer feedback has been overwhelmingly positive too. I am very proud to call the VTF-15H our most flexible, most capable, and most innovative subwoofer design ever.

Thank you again to everyone for the support. It makes the occasional long and sleepness nights well worth it!

Sincerely,
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  #349  
Old February 17th, 2011, 2:39 AM
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Exactly. That proves the reviewer didn't communicate at all with you guys, since using the EQ1 with 1 port setting as the "recommended setting" for CEA2010 max output levels, instead of max headroom mode...
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Old February 17th, 2011, 3:13 AM
Pete_Hsu Pete_Hsu is offline
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Hi Cacimar,

The choice of operating mode switch (ie. EQ1, EQ2) and Q control setting (ie. 0.3, 0.5, 0.7, etc.) will not have any effect on the CEA2010 max clean output, but will have a dramatic effect on frequency response and frequency response sweeps done at increasing levels.

Sincerely,
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Old February 17th, 2011, 3:29 AM
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OK. Point taken, but I was pointing out that he liked to let the owners see/knew the EQ1 weaknesses, and that he didn't even tried to hear it at its recommended EQ2 high playback level.Therefore, he is confusing the users by telling them "hey, look it did 20hz but with a lot of mechanical noises at the recommended HSU EQ1 setting".
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Old February 17th, 2011, 4:07 AM
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Originally Posted by Matt34 View Post
For someone that requested to be removed from the AH community, you still show a lot of interest in what goes on over there.

You and your rag-tag group of fan boys aren't doing a reputable company like HSU any favors within the community with posts like the above.
Matt,

Seriously, did you read the review? You didn't feel that Paul was out of line several times? I thought that the review was supposed to be about numbers, not conjectures? If we all could only be privy to the emails concerning all parties, I think that you and others would see this in a different light. With that said I am not a fanboy, and I do appreciate the effort, time and monies spent by Gene. And not only is HSU a reputable company, they do it with fantastic support and class. Regards....
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Old February 17th, 2011, 4:07 AM
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Originally Posted by cacihome
OK. Point taken, but I was pointing out that he liked to let the owners see/knew the EQ1 weaknesses, and that he didn't even tried to hear it at its recommended EQ2 high playback level.Therefore, he is confusing the users by telling them "hey, look it did 20hz but with a lot of mechanical noises at the recommended HSU EQ1 setting".
This is true. Also, pushing the driver to the point of mechanical noise was not a realistic test. I mean, if the response was swept to 18Hz instead of 10Hz, then the driver would not have bottomed out. Interestingly enough, I have yet to hear from anyone who has gotten the driver to distort with real world program material.

Sincerely,
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Old February 17th, 2011, 4:12 AM
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For someone that requested to be removed from the AH community, you still show a lot of interest in what goes on over there.

You and your rag-tag group of fan boys aren't doing a reputable company like HSU any favors within the community with posts like the above.
What are you stalking him? Sound familiar?
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Old February 17th, 2011, 5:29 AM
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This is true. Also, pushing the driver to the point of mechanical noise was not a realistic test. I mean, if the response was swept to 18Hz instead of 10Hz, then the driver would not have bottomed out. Interestingly enough, I have yet to hear from anyone who has gotten the driver to distort with real world program material.

Sincerely,
Yep. You know I love to pound subs to death, and always try to see their limits, but in this case, the VTF-15 won. I have not heard anything but clean waves from that sub. Remember I have measured uncorrected 116dbs peaks at my listening position. So the sub, at 1 feet, in my room with gain, must be playing something like over 130dbs at some freqs...

Concrete houses rock!
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Old February 17th, 2011, 7:13 AM
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Well this is just my two cents. I didn't even read the 2nd review on AH. I think people get way caught up on specs and details that they will never even hear in real life. I realize Pete has to respond to the review since so many people get bent out of shape about the smallest things that, like I said, they can't even hear with their own ears.

The thing is, people who have actually bought and heard the VTF-15 are saying it is fantastic and I believe them. I have nothing but respect for Hsu - Dr. Hsu, Pete and the company, and their products. Yes, I don't like seeing reviews that don't seem to be accurate but what I'm trying to say is that so many people get caught up in the little details yet, they couldn't hear those so-called differences if you put them in a room and blindfolded them and asked which one was which.

If the sub sounds good and has the impact they want, then isn't that really why you are spending your money?

(again, I am not saying this against Pete since he has to respond, but about those whose whole day is ruined if something is 2 db down at 18 hz instead of 1 db down at 18 hz.
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Old February 17th, 2011, 9:12 AM
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Good post monk, testing subs out in parking lots on their sides is far from real world usage. I read the first Audioholics review and was disappointed in the sometimes nitpicking tone. I mean the guy criticized Hsu Research for naming the wood veneer option Rosenut instead of Rosewood!

I bought one yesterday and am impatiently waiting for Fedex to do its thing.
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Old February 17th, 2011, 1:34 PM
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Yep. You know I love to pound subs to death, and always try to see their limits, but in this case, the VTF-15 won. I have not heard anything but clean waves from that sub. Remember I have measured uncorrected 116dbs peaks at my listening position. So the sub, at 1 feet, in my room with gain, must be playing something like over 130dbs at some freqs...

Concrete houses rock!
+1 dude.

I think the dudes over at AH are on some good drugs. Give me a brake, Emotiva sub???? That thing is a joke, not even in the same league as the VTF15H.
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Old February 17th, 2011, 1:36 PM
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Originally Posted by runnin View Post
Good post monk, testing subs out in parking lots on their sides is far from real world usage. I read the first Audioholics review and was disappointed in the sometimes nitpicking tone. I mean the guy criticized Hsu Research for naming the wood veneer option Rosenut instead of Rosewood!

I bought one yesterday and am impatiently waiting for Fedex to do its thing.
Congrats on your purchase, you will love the sub.
Welcome to the HSU family.
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Old February 17th, 2011, 2:06 PM
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Pete,

After many emails with you I just wanted to let you know that I have put in my order the the VTF-15. I know I will be as happy as when I purchased the VTF-3 MK3 three years ago. I will let you know my in room rew results and impressions as soon as I can. I also know my wife and 4 year old grandson are not going to be too happy with me. Hey, they just have to deal with it, right? Now, if I can only hide it somewhat........
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Old February 17th, 2011, 2:15 PM
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+1 dude.

I think the dudes over at AH are on some good drugs. Give me a brake, Emotiva sub???? That thing is a joke, not even in the same league as the VTF15H.
RIGHT!...lmao too funny..
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Old February 17th, 2011, 2:21 PM
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Pete, just checking to see if it shipped yet? J/K!!!
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Old February 17th, 2011, 4:12 PM
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LOL, 15 minutes later...hasn't it been delivered yet?
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Old February 17th, 2011, 5:24 PM
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Mine left the warehouse last night at 11:32pm according to fedex ,headed for northern Washington state, . It's now almost 5:30pm the next day, and that's like 17 hours of driving! I really hope it makes it by Saturday morning, waitaminute, does anyone know if Fedex delivers on Saturdays?
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Old February 17th, 2011, 5:33 PM
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Ground may not...I think everything but ground delivers on Saturday...

But..if they plan to intend to deliver on Saturday...Their Estimated Delivery Date would say Feb 19, 2011.

Usually their estimated delivery date is accurate.
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Old February 17th, 2011, 8:12 PM
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Here in CT, FedEx ground delivers on Saturday.
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Old February 17th, 2011, 8:18 PM
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Mine left the warehouse last night at 11:32pm according to fedex ,headed for northern Washington state, . It's now almost 5:30pm the next day, and that's like 17 hours of driving! I really hope it makes it by Saturday morning, waitaminute, does anyone know if Fedex delivers on Saturdays?
runnin - where do you live?
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Old February 17th, 2011, 10:13 PM
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I'm actually in Canada and am going to pick the sub up in Sumas WA.

And Fedex says Feb 21, but they've been early before with Emo gear. I guess I won't hold my breath though, I'll have to make arrangements to borrow a van for Monday too.
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Old February 18th, 2011, 7:05 AM
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Good post monk, testing subs out in parking lots on their sides is far from real world usage. I read the first Audioholics review and was disappointed in the sometimes nitpicking tone. I mean the guy criticized Hsu Research for naming the wood veneer option Rosenut instead of Rosewood!

I bought one yesterday and am impatiently waiting for Fedex to do its thing.
Congrats runnin!....WE owners know what the VTF-15H is capable of...
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Old February 18th, 2011, 7:10 AM
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FedEx was very accurate for me also!..untill the very last day with my tracking number it was telling me that the sub was like one hour away from my place and was coming....
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Old February 18th, 2011, 7:12 AM
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Congrats runnin!....WE owners know what the VTF-15H is capable of...
Well I hope to join the ranks of VTF-15H owners soon! Of course I pay attention to what the reviews say but I place a higher value on the opinions of consumers like you who have actually listened to the item in question. I've heard nothing but good things and Hsu is a brand I trust. What else is there to think about?
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Old February 18th, 2011, 7:13 AM
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Pete,

After many emails with you I just wanted to let you know that I have put in my order the the VTF-15. I know I will be as happy as when I purchased the VTF-3 MK3 three years ago. I will let you know my in room rew results and impressions as soon as I can. I also know my wife and 4 year old grandson are not going to be too happy with me. Hey, they just have to deal with it, right? Now, if I can only hide it somewhat........
Congrats Sepen....
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Old February 18th, 2011, 7:18 AM
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Well I hope to join the ranks of VTF-15H owners soon! Of course I pay attention to what the reviews say but I place a higher value on the opinions of consumers like you who have actually listened to the item in question. I've heard nothing but good things and Hsu is a brand I trust. What else is there to think about?
HSU and Pete in the first place been the best costumer support i have never dealed with!...
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Old February 18th, 2011, 11:57 AM
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I just placed my order for a 2nd 15H in Rosenut. My wife is trying to get to promise no more HT purchases for a while lol. The new Oppo is tempting, we'll see.

Jim
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Old February 18th, 2011, 12:03 PM
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I just placed my order for a 2nd 15H in Rosenut. My wife is trying to get to promise no more HT purchases for a while lol. The new Oppo is tempting, we'll see.

Jim
Damn lucky you!..lmao...congrats!
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Old February 18th, 2011, 12:11 PM
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Thanks, I have a pretty special wife.
I do have a good size space to fill at about 4500 cu ft (by my math), so another won't hurt me any.
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Old February 18th, 2011, 12:37 PM
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I think your wife is like my wife...awesome!

I bought the VTF2-MK3 and two months later realized I wanted the VTF-15H. I told the wife I would sell the first to help pay for the second. I ended up buying the 15H and posted the VTF2 on several forums and craigslist.

On Valentines day, she gave me the news that I could just keep both.

Tonight is when I setup the 2nd one and calibrate my system for about the 40th time.
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Old February 18th, 2011, 12:47 PM
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I think your wife is like my wife...awesome!

I bought the VTF2-MK3 and two months later realized I wanted the VTF-15H. I told the wife I would sell the first to help pay for the second. I ended up buying the 15H and posted the VTF2 on several forums and craigslist.

On Valentines day, she gave me the news that I could just keep both.

Tonight is when I setup the 2nd one and calibrate my system for about the 40th time.
Could be man, Michigan isn't far from Ontario, if your wife works evenings and mine works days ummm
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Old February 18th, 2011, 2:14 PM
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*sigh* I found out this morning that my sub won't be delivered until next Monday for sure. It's a bummer as I originally ordered it 5 minutes after sales opened last Monday(hoping it could ship from California to Washington state in 4 days), but being from Canada my credit card company needed to add Sumas WA as a secondary address. So that cost me a day and a half until the transaction went through.

Oh well, absence makes the heart grow fonder!
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Old February 18th, 2011, 2:18 PM
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*sigh* I found out this morning that my sub won't be delivered until next Monday for sure. It's a bummer as I originally ordered it 5 minutes after sales opened last Monday(hoping it could ship from California to Washington state in 4 days), but being from Canada my credit card company needed to add Sumas WA as a secondary address. So that cost me a day and a half until the transaction went through.

Oh well, absence makes the heart grow fonder!
It's worth the wait imho.
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Old February 19th, 2011, 7:08 AM
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Just looked at the Fedex site and my sub is out for delivery! Woohoo!
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Old February 19th, 2011, 7:15 AM
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Just looked at the Fedex site and my sub is out for delivery! Woohoo!
woohoo..lol...will you post pics runnin?
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Old February 19th, 2011, 7:26 AM
Sepen Sepen is offline
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Just make sure you run it on it's side!


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Just looked at the Fedex site and my sub is out for delivery! Woohoo!
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Old February 19th, 2011, 8:20 AM
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Just looked at the Fedex site and my sub is out for delivery! Woohoo!
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Old February 19th, 2011, 12:10 PM
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Pete,

After many emails with you I just wanted to let you know that I have put in my order the the VTF-15. I know I will be as happy as when I purchased the VTF-3 MK3 three years ago. I will let you know my in room rew results and impressions as soon as I can. I also know my wife and 4 year old grandson are not going to be too happy with me. Hey, they just have to deal with it, right? Now, if I can only hide it somewhat........
Good deal Sam, I truly appreciate this, and I'm really looking forward to your impressions! I'd love to hear what operating mode and Q control settings work best for you too

Take care, have a great weekend guys!

Sincerely,
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Old February 19th, 2011, 12:12 PM
Pete_Hsu Pete_Hsu is offline
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Just looked at the Fedex site and my sub is out for delivery! Woohoo!
Wow, Saturday delivery, very nice runnin!
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Old February 20th, 2011, 7:51 AM
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Just looked at the Fedex site and my sub is out for delivery! Woohoo!
Where r u hiding? Enjoying the sub r we? Details!!
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Old February 20th, 2011, 7:54 AM
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Where r u hiding? Enjoying the sub r we? Details!!
I was about to ask the same!.......
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Old February 20th, 2011, 9:19 AM
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I was about to ask the same!.......
Unfortunately, the phrase, "On Fedex vehicle for delivery" does not mean that your package is going to be delivered that day. Which strikes me as a little bit odd, but there you go. I have to wait until Monday, probably afternoon, to pick the sub up. Sorry for the false alarm.
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Old February 20th, 2011, 9:40 AM
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Unfortunately, the phrase, "On Fedex vehicle for delivery" does not mean that your package is going to be delivered that day. Which strikes me as a little bit odd, but there you go. I have to wait until Monday, probably afternoon, to pick the sub up. Sorry for the false alarm.
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Old February 20th, 2011, 11:20 AM
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Unfortunately, the phrase, "On Fedex vehicle for delivery" does not mean that your package is going to be delivered that day. Which strikes me as a little bit odd, but there you go. I have to wait until Monday, probably afternoon, to pick the sub up. Sorry for the false alarm.
I'd go by the date they gave you on the tracker.
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Old February 20th, 2011, 3:25 PM
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Unfortunately, the phrase, "On Fedex vehicle for delivery" does not mean that your package is going to be delivered that day. Which strikes me as a little bit odd, but there you go. I have to wait until Monday, probably afternoon, to pick the sub up. Sorry for the false alarm.
Thats a shame they did not deliver but it costs alot of money when you ask Fedex to do a Saturday delivery. I ship rental AV equipment and computers for a living and we very seldom pick the Sat delivery unless a gig takes place on a Sunday. So you will get it Monday morning and maybe you will feel a cold coming on... cough ... cough
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Old February 20th, 2011, 5:06 PM
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Thats a shame they did not deliver but it costs alot of money when you ask Fedex to do a Saturday delivery. I ship rental AV equipment and computers for a living and we very seldom pick the Sat delivery unless a gig takes place on a Sunday. So you will get it Monday morning and maybe you will feel a cold coming on... cough ... cough
I know the flu is going around, at least 5-8 days.
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Old February 20th, 2011, 5:24 PM
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Monday is President's Day. Will they deliver?

You might be waiting until Tuesday
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Old February 20th, 2011, 5:57 PM
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Good point. I found a Fedex web page that seems to indicate they will be open for business this day.

I also went to the webpage for Ship Happens, and they do not indicate they'll be closed, but I'll be phoning them in the morning. Hopefully I don't have to wait until Tuesday. (crosses fingers!)
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Old February 20th, 2011, 7:07 PM
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I'm pretty sure they deliver. UPS/FedEx only close/do not deliver on the main federal holidays.
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Old February 21st, 2011, 3:24 PM
Sepen Sepen is offline
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Runnin..is it in the house?
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Old February 21st, 2011, 4:57 PM
runnin runnin is offline
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Yes. Without yet calibrating with Audyssey, I've tried it in Max SPL and Max extension.

I played the Inception chair dunk scene, War of The World machine rises scene and the Master and Commander First attack(cannon intensive) scene. I think I had the sub at 9:30 volume and the AVR at -20. Oh, and the Kung Fu Panda skadoosh scene.

The sub is crazy. Freaking crazy. Cupboard doors were rattling. Dishes were rattling. My gas fireplace was rattling. My chair was shaking and my buddy said it feels like an earthquake. Then I played the low frequency CD. I never knew an organ could punch you in the gut. But this all makes things complicated.

My wife is not going to like this I think. I was trying to get her used to the idea with our old sub turned up in the past couple of weeks but when she gets home I gotta have it turned WAY down I think.

What an amazing sub. Best purchase ever.
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Old February 21st, 2011, 5:30 PM
Sepen Sepen is offline
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at -20



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Originally Posted by runnin View Post
Yes. Without yet calibrating with Audyssey, I've tried it in Max SPL and Max extension.

I played the Inception chair dunk scene, War of The World machine rises scene and the Master and Commander First attack(cannon intensive) scene. I think I had the sub at 9:30 volume and the AVR at -20. Oh, and the Kung Fu Panda skadoosh scene.

The sub is crazy. Freaking crazy. Cupboard doors were rattling. Dishes were rattling. My gas fireplace was rattling. My chair was shaking and my buddy said it feels like an earthquake. Then I played the low frequency CD. I never knew an organ could punch you in the gut. But this all makes things complicated.

My wife is not going to like this I think. I was trying to get her used to the idea with our old sub turned up in the past couple of weeks but when she gets home I gotta have it turned WAY down I think.

What an amazing sub. Best purchase ever.
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  #400  
Old February 21st, 2011, 6:36 PM
runnin runnin is offline
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Yeah, the sub level/eq settings in the AVR were for the old sub, a small old bandpass design, so I expect the signal was pretty hot to compensate. Whatever, I am a happy man diggin' the lows!
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