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#325226 - 10/08/10 10:13 PM Corner Bass Traps
majik Offline
local

Registered: 09/28/08
Posts: 288
I'm looking to build some traps from floor to ceiling... I will be cutting the insulation in 2' triangles... do I push them up against the wall, or keep a space between the wall and the corner piece (like acoustic panels are supposed to have)?

If I keep a space, how many inches from the wall should I keep it?
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Epic 80 system
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Optoma HD20
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#325228 - 10/08/10 10:24 PM Re: Corner Bass Traps [Re: majik]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7042
Loc: Canada
There is no need to space it off the wall. If the trap is a solid triangle it will not affect absorption at higher frequencies and its going to take a few feet to make any difference at lower frequencies.
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Fred

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#325232 - 10/08/10 11:05 PM Re: Corner Bass Traps [Re: majik]
JohnK Offline
shareholder in the making

Registered: 05/11/02
Posts: 10386
Maj, you say that "insulation" is going to be used for "bass traps". The problem, as Fred mentioned, is that simple absorption of sound by fiber glass or similar insulation material isn't very efficient at very low frequencies. There seems to be some enthusiasm on the internet for this type of installation which isn't completely in accord with acoustic principles. The literature indicates(e.g. Toole, Sound Reproduction, p.476)that to be effective at bass frequencies the insulation would have to be about 1/4 wavelength deep. The 100Hz wavelength is about about 11.3 feet and 20Hz about 56.5 feet.

Mechanically resonant membrane absorbers are more efficient at these very low frequencies and electronic equalization may be a more practical approach at these frequencies.
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#325257 - 10/09/10 04:47 PM Re: Corner Bass Traps [Re: JohnK]
michael_d Offline
connoisseur

Registered: 07/23/04
Posts: 3903
Loc: Up yonder
I built some a while back. This is a good thread with a lot of info on them, plus pics detailing how I built mine.

http://www.axiomaudio.com/boards/ubbthreads.php?ubb=showflat&Number=248931&page=2
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#325325 - 10/11/10 12:01 AM Re: Corner Bass Traps [Re: michael_d]
nickbuol Offline
connoisseur

Registered: 09/16/04
Posts: 4450
Loc: Marion, IA
Sirquack has some in his theater...
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#325581 - 10/14/10 01:06 PM Re: Corner Bass Traps [Re: nickbuol]
majik Offline
local

Registered: 09/28/08
Posts: 288
mechanically resonant membrane absorbers?? lol!
_________________________
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Epic 80 system
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Denon 3808
Optoma HD20
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vp180
extra QS8s (to come soon)

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#325590 - 10/14/10 01:40 PM Re: Corner Bass Traps [Re: majik]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3448
Loc: Western Maryland, USA
What's funny about that? It's the principal behind the amazing Tube Traps. They work quite a bit better than stacks of insulation, and cost a whole lot more.
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Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
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#325595 - 10/14/10 01:53 PM Re: Corner Bass Traps [Re: JohnK]
fredk Offline
axiomite

Registered: 12/06/07
Posts: 7042
Loc: Canada
Quote:
The problem, as Fred mentioned, is that simple absorption of sound by fiber glass or similar insulation material isn't very efficient at very low frequencies.

The corner traps will be quite effective down to about 100Hz. John. Have you seen any designs for resonant membrane absorbers? I did a LOT of research on this topic a while back and was never able to find any sort of design principle to follow.

In the end, I bought a Behringer feedback destroyer to clean up my bass between 20 and 100 Hz.
_________________________
Fred

-------
Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!

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#325630 - 10/14/10 05:43 PM Re: Corner Bass Traps [Re: ClubNeon]
majik Offline
local

Registered: 09/28/08
Posts: 288
Originally Posted By: ClubNeon
What's funny about that? It's the principal behind the amazing Tube Traps. They work quite a bit better than stacks of insulation, and cost a whole lot more.


No no.. I'm laughing at my ignorance on the subject, not the subject itself... It was like reading Chinese - I had never heard of that before and when I googled it, the sites it brought me to were thesis-like... so I thought it would be easier to come back here and ask what you meant and where I can get some info in layman's terms.

Is it something I buy as in - is it the name of a product or is it a method I can use? if the latter, then what do I buy to use the method?
_________________________
- Majik

Epic 80 system
Ep 800
Denon 3808
Optoma HD20
PS3
vp180
extra QS8s (to come soon)

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#325645 - 10/14/10 09:32 PM Re: Corner Bass Traps [Re: majik]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3448
Loc: Western Maryland, USA
You can buy products that make use of the technology here: http://www.tubetrap.com/ Especially, the upgraded Helmholtz Traps (+25% to the price) absorb more low frequency energy for anything of a similar enclosed volume.
_________________________
Pioneer VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs
-Chris

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