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  #1  
Old January 10th, 2012, 8:03 PM
Moneypit Moneypit is offline
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VTF3 Mk4 question

Ok I need a little help, I have a VTF3 MK4 the settings are listed below. I was watching Cloverfield and started noticing a popping noise during a few scenes of the movie, could I be bottoming it out?


On Sub:

Volume: 10 O'clock
Phase: 0
Operating Mode: EQ2 with one port plugged
Q Control: .45
Crossover set to: Off

Reciever:RX-A710
Crossover set to:80Hz
Volume set to: -10Db

Thanks,

Moneypit
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  #2  
Old January 11th, 2012, 6:45 AM
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cacihome cacihome is offline
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You need a more powerful sub..hehehe
IE. VTF-15H...

What are your room dimensions?
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  #3  
Old January 11th, 2012, 12:03 PM
Pete_Hsu Pete_Hsu is offline
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Hi moneypit,

Try setting Q = 0.3, and reduce the subwoofer channel level in 1dB increments to reduce the risk of pushing the driver past it's linear excursion limits.

Are you using any Auto-EQ on the A/V receiver? Where are you sitting relative to front/side/back walls and relative to subwoofer?

Thanks
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Old January 11th, 2012, 2:05 PM
Moneypit Moneypit is offline
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Quote:
Originally Posted by Pete_Hsu View Post
Hi moneypit,

Try setting Q = 0.3, and reduce the subwoofer channel level in 1dB increments to reduce the risk of pushing the driver past it's linear excursion limits.

Ok I will try it.

Are you using any Auto-EQ on the A/V receiver?

Yes I have run the YPAO on the Yamaha RX-a710 and then went a little higher on the sub volume.

Where are you sitting relative to front/side/back walls and relative to subwoofer?

Rear of sub is 3' from wall and driver side is 4' from wall.

Thanks
Pete, thanks for your time.
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  #5  
Old January 11th, 2012, 3:22 PM
Pete_Hsu Pete_Hsu is offline
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Hi Moneypit,

Can you provide a diagram of your room, showing the listening position relative to front/side/back walls and relative to subwoofer? If you can list room dimensions too, that would be great.

Thanks
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  #6  
Old January 11th, 2012, 4:08 PM
Moneypit Moneypit is offline
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Pete,

The sub is tucked in between the sofa and love seat used as an end table, not in the corner of the room as in the diagram. The rear of the sub/ports is pointed towards the wall three feet from it and the driver on the side is 4' from the front wall.

http://i200.photobucket.com/albums/a...LivingRoom.jpg

Last edited by Moneypit : January 11th, 2012 at 4:18 PM.
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  #7  
Old January 11th, 2012, 6:31 PM
Pete_Hsu Pete_Hsu is offline
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Thanks Moneypit. Have you tried placing the subwoofer in that nearfield corner (keeping at least 2" of space between the driver and anything it fires into, and at least 4" of space between the ports and anything they fire into)?

This is a very large and open space to fill, no doubt!

Sincerely,
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  #8  
Old January 12th, 2012, 5:03 PM
Moneypit Moneypit is offline
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Quote:
Originally Posted by Pete_Hsu View Post
Thanks Moneypit. Have you tried placing the subwoofer in that nearfield corner (keeping at least 2" of space between the driver and anything it fires into, and at least 4" of space between the ports and anything they fire into)?

This is a very large and open space to fill, no doubt!

Sincerely,
It is where it has to be for WAF Does it sound like I could be bottoming it out? I will try the setting you suggested and report back.
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  #9  
Old January 16th, 2012, 8:21 PM
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TimmyD TimmyD is offline
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MoneyPit:
You mentioned that your running the sub in maxExtension mode. Im thinking you are probably hearing the port "chuffing". A sub that bottoms out sounds like a clanking metal to metal sound. When a port "chuffs" its more of a popping noise.

When you cut down on the amount of space that the air in the box can go in&out it can create turbulance. This is what happens at high volumes when only 1 port is open.

Try setting your sub to EQ2 & have BOTH ports open. I bet you wont hear that popping. I was able to get my VTf-15h to "pop" in MaxExt mode. I was testing to see how high i could turn it up to. But in MaxOutput mode i cant get it to "chuff" OR bottom out.

HSU subs are built exceptionally well. The only time they can misbehave is occasionally in MaxExtension mode. Its that port noise that happens before any bottoming out. I would almost always recommend their subs be set to MaxOutput because of this.

So try that out & let us know what happens!!
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