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-   -   Confused about volume control on VTF-3 MK5 HP (http://forum.hsuresearch.com/showthread.php?t=96114)

terryjg55 April 17th, 2019 4:28 PM

Confused about volume control on VTF-3 MK5 HP
 
I just received my new VTF-3 MK5 HP and am getting ready to add it to my system. I have a new Onkyo receiver (TX-NR787 THX Certified) that will be doing the initial setup for me. It uses a proprietary equalization system, rather than Audessy, to balance everything.

I am curious why the recommended setting for the volume control is so low (8 O'clock, which is almost the minimum). It seems to me (an admitted noob) that a somewhat higher volume setting on the sub would be asking for less from the amplifier.

What am I missing?

Kevin_Hsu April 18th, 2019 8:30 AM

Hi there,

It really depends on your room, but our recommended setting would be to set the sub volume around 9 o'clock. Though, admittedly the sub is less sensitive as it was before, it is still fairly sensitive, so setting the sub upwards to 12-1 o'clock is generally a fairly high setting. However, it is worth noting that it also depends on the level that the sub is receiving from the receiver as well. For example, in many cases, the LFE channel level can go from -12 to +12 dB (24 dB difference). Sometimes it can be more than that, but that setting determines how much voltage is being sent to the sub. All things being equal, +12 on the LFE setting would mean that you wouldn't be able to turn up the volume on the sub as much before it starts to hit its limits versus having a -12 dB setting. Sensitivity of the speakers and the type of material being played also have an impact on that as well.

You are correct in that a higher setting of volume on the sub means that you don't have to turn up the channel level as much from the receiver end to get the same output. However, if you run the auto-calibration software and the LFE level is set to 0 or below, then it won't matter as much. So what I would do, if the receiver doesn't have you set a level on the sub to begin with, is run the calibration with the volume a 9 o'clock. After that, check your speaker settings to make sure your speakers are set to small, 80 Hz crossover is generally a good starting point unless your speakers are on the smaller side (4" midrange and below). Also check your channel levels. If the receiver set your sub to -12 and your speakers are around 0, that means your sub is set to high, if it is set to +12 and your speakers are set to 0, your sub is set too low.

DS3 October 2nd, 2019 3:58 PM

For what it’s worth, I have the 686 and it always set my VTF3.5 high (+2 or 3db) with sub gain around 9 o’clock until I got a y-adapter. At one point I even had the sub gain close to 12 and it still set it at +1db. Bizarre. Now it’s set at -1db in the AVR with the sub gain a hair over 10 o’clock. I think it just has a low voltage LFE signal.

Kevin_Hsu October 3rd, 2019 2:15 PM

Hard to say, but I've heard a few others report that as well. It's quite strange. With the y-adapter, that does double in the input voltage going to the sub so it ends up adding an additional 6 dB to the input signal. So technically, with the y-splitter, the channel level should be around -4 or -3 dB.

DS3 October 4th, 2019 5:42 AM

Quote:

Originally Posted by Kevin_Hsu (Post 137114)
Hard to say, but I've heard a few others report that as well. It's quite strange. With the y-adapter, that does double in the input voltage going to the sub so it ends up adding an additional 6 dB to the input signal. So technically, with the y-splitter, the channel level should be around -4 or -3 dB.


I'm planning on running AccuEq again now that I have the y-adapter to see if it helps my 686 set better levels automatically. If it still acts funny, I will just go back to setting the sub gain at just over 10 o'clock and set the AVR sub level to around -3dB using the dB app on my phone.

One question on mic placement...I'm using the Onkyo mic on a high-end photo tripod (carbon fiber, ~$1500 including the head) so it is pretty good about not transmitting extra vibrations, but when I set it up, should I keep it solely on the sofa cushions and not let it touch the floor to make it as isolated as possible?

Kevin_Hsu October 4th, 2019 10:14 AM

Quote:

Originally Posted by DS3 (Post 137115)
I'm planning on running AccuEq again now that I have the y-adapter to see if it helps my 686 set better levels automatically. If it still acts funny, I will just go back to setting the sub gain at just over 10 o'clock and set the AVR sub level to around -3dB using the dB app on my phone.

One question on mic placement...I'm using the Onkyo mic on a high-end photo tripod (carbon fiber, ~$1500 including the head) so it is pretty good about not transmitting extra vibrations, but when I set it up, should I keep it solely on the sofa cushions and not let it touch the floor to make it as isolated as possible?

That probably won't matter too much to be honest, but I would just keep it on the sofa to be closest to your ear position.

DS3 October 4th, 2019 11:56 AM

Quote:

Originally Posted by Kevin_Hsu (Post 137116)
That probably won't matter too much to be honest, but I would just keep it on the sofa to be closest to your ear position.


You were correct. I ran it earlier with the sub at 9 o'clock, AVR trim at 0dB and AccuEQ set the trim +1dB, so I moved the sub gain to 10 o'clock, reran AccuEQ and it then set it at +2dB?!? It also set the distance at about half (~7ft) of what it actually measures at (~15ft). I cannot explain this and I give up on AccuEQ as it obviously cannot calibrate subs.

So I did it manually, correcting the distance, setting the sub gain back to 9 o'clock, AVR trim to 0dB and increasing master volume until I got 78-80dB for 50Hz at MLP, which occured at -25dB master volume. I then backed AVR trim to -5dB and bumped the sub gain (now just under the next tick up from 9 o'clock)to get the MLP SPL back to 78-80dB.

Does this sound about right? Any other thoughts/suggestions?


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