Subwoofer Placement

vls · 23rd January 2006, 11:12 AM

Hi!

I've got the Adam P22a and the new Adam Sub12. But at my listening position, i have various problems: There are some cancellation Frequencies, and some resonant frequencies. The rooms dimensions are (in centimetres): Length: 450, Width: 360 (on the left is a 80 cm deep cabinet over the whole length), Height: 220.

At first i wanted to fix the Subwoofer position (because i cant get the problems solved with foam absorbers). Where to place the sub correctly? At the moment it's placed left to the Table (image is attached).

Thanks in advance,

Volker

narco · 23rd January 2006, 12:05 PM

looks to me like you should do some research into room acoustics, ethan winers forum is a good sart.

All that foam as you have in your room (from what I can see) will absorb only highs and give awful wobbley bass frequencies.

I would definitely lookinto this before postioning your sub.

I don't mean to come accross rude, just trying to be helpful
Narco

ILL · 23rd January 2006, 12:40 PM

Yeah, most peoples vocal booth look like that. Get some bass absorption because standing waves are causing you bass problems.

vls · 23rd January 2006, 12:56 PM

Hi!

I Know that i can only affect the high and hi-mid frequencies with the foam.

And I heard that I cant affect the low frequencies with foam generally (also not with really thick absorbers) and i should use helmholtz resonators. Is this true?

Thanks,

Volker

6strings · 23rd January 2006, 01:34 PM

http://www.ethanwiner.com/acoustics.html

A must-read.

blayz2002 · 23rd January 2006, 05:10 PM

Quote:

Originally Posted by Labs

Already mentined but:
that does indeed look like a hostile mixing enviroment...You will probably benifit from taking down some foam and putting up some basstraps of some kind...

Gustav

I would agree looks like you'll be getting quite a boxy sound as all that foam will be killing all the high end detail. You need it more strategically placed to kill reflections to you mixing position, not the whole room.

Ethan Winer · 23rd January 2006, 08:09 PM

Volker,

> I heard that ... i should use helmholtz resonators. <

You already got the right answer - you need bass traps. In general, tuned traps like Helmholtz are not the best solution for rooms the size yours appears to be. The best approach is broadband bass traps in as many corners as you can manage.

--Ethan

tINY · 24th January 2006, 03:04 AM

If that doesn't do enough for you, you need to look into multiple subs - 2, 4 or even 6 subs in the right places can even out the bass response.

But try the corner traps first.

-tINY

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23rd January 2006, 11:12 AM	#1
vls Gear maniac Join Date: Jan 2005 Posts: 183	Subwoofer Placement Hi! I've got the Adam P22a and the new Adam Sub12. But at my listening position, i have various problems: There are some cancellation Frequencies, and some resonant frequencies. The rooms dimensions are (in centimetres): Length: 450, Width: 360 (on the left is a 80 cm deep cabinet over the whole length), Height: 220. At first i wanted to fix the Subwoofer position (because i cant get the problems solved with foam absorbers). Where to place the sub correctly? At the moment it's placed left to the Table (image is attached). Thanks in advance, Volker Attached Thumbnails

23rd January 2006, 08:09 PM	#7
Ethan Winer Lives for gear Join Date: Oct 2002 Location: New Milford, CT, USA Posts: 4,134	Volker, > I heard that ... i should use helmholtz resonators. < You already got the right answer - you need bass traps. In general, tuned traps like Helmholtz are not the best solution for rooms the size yours appears to be. The best approach is broadband bass traps in as many corners as you can manage. --Ethan __________________ www.realtraps.com The acoustic treatment experts ----------------------- Amazing Telecaster guitar video

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23rd January 2006, 12:05 PM	#2
narco Lives for gear Join Date: Jan 2004 Location: Switzerland/New Zealand/guitar case Posts: 2,730	looks to me like you should do some research into room acoustics, ethan winers forum is a good sart. All that foam as you have in your room (from what I can see) will absorb only highs and give awful wobbley bass frequencies. I would definitely lookinto this before postioning your sub. I don't mean to come accross rude, just trying to be helpful Narco

23rd January 2006, 12:40 PM	#3
ILL Gear maniac Join Date: Aug 2005 Posts: 152	Yeah, most peoples vocal booth look like that. Get some bass absorption because standing waves are causing you bass problems.

23rd January 2006, 12:56 PM	#4
vls Gear maniac Join Date: Jan 2005 Posts: 183	Hi! I Know that i can only affect the high and hi-mid frequencies with the foam. And I heard that I cant affect the low frequencies with foam generally (also not with really thick absorbers) and i should use helmholtz resonators. Is this true? Thanks, Volker

23rd January 2006, 01:34 PM	#5
6strings Lives for gear Join Date: Aug 2005 Location: New England Posts: 958	http://www.ethanwiner.com/acoustics.html A must-read.

24th January 2006, 03:04 AM	#8
tINY Lives for gear Join Date: Jul 2004 Location: Orygun Posts: 5,714	If that doesn't do enough for you, you need to look into multiple subs - 2, 4 or even 6 subs in the right places can even out the bass response. But try the corner traps first. -tINY