material with highest absorption coefficient at low frequencies

thadman · 23rd July 2007, 05:58 AM

I'm looking for a material with as good or better absorptive properties as Corning Owens Rigid Fiberglass for super low frequencies (10-100hz) but is stuffable (like regular cotton or fiberglass) and doesn't cost an arm and a leg.

Anybody know an available product with these qualities?

Inductor · 23rd July 2007, 08:23 AM

Rockwool (?)...
what is your idea? ...price only?
(funny) you are not thadman from the thad-dance are you?

crazyhub · 23rd July 2007, 04:23 PM

I use Rockwool "rock-up b naked", h120cm x w60cm x t10cm for my low bass-traps. It has very high density and an overdensified face. Killing low-bass waves is very hard to get...Otherwise contact your sub-marine army

thadman · 23rd July 2007, 11:57 PM

Do you have any objective data regarding the rock wool? Are there various types? Where did you purchase yours? Have you compared it against Rigid Fiberglass?

454Casull · 24th July 2007, 12:06 AM

Could you possibly use a bass trap of some sort?

Magura · 24th July 2007, 12:08 AM

There are many kinds of acoustical absorbtion materials. Most of the ones I've seen have been based on paper pulp or rockwool.
Do a search, loads of manufacturers will show up.

There are different types for different frequencies, so you gotta measure where your problem is.

Another point to keep in mind is that a room becomes unpleasent to be in, if it's too dead, which is fairly easily achieved. I have recently seen that happen in an other application for a "dead" room.

Magura

Magura · 24th July 2007, 12:09 AM

Quote:

Originally posted by 454Casull
Could you possibly use a bass trap of some sort?

A much better idea, and both cheaper and easier as well......

Magura

noah katz · 24th July 2007, 01:23 AM

"Could you possibly use a bass trap of some sort? "

"A much better idea, and both cheaper and easier as well......"

I thought that's what he was describing.

Magura · 24th July 2007, 01:33 AM

A bas trap is not really a material, but rather an acoustic element that is tuned to resonate at a frequency range, usually pretty narrow.

This coud be in shape of a sonotube or the like.

Magura

noah katz · 24th July 2007, 01:36 AM

I know, but he said 10-100 Hz.

OTOH his room probably only has a few modes in that range so tuned traps might make more sense, though I've never heard of anyone actually using them; too hard to get right, I think.

23rd July 2007, 05:58 AM	#1
thadman diyAudio Member Join Date: Dec 2005 Location: west lafayette	material with highest absorption coefficient at low frequencies I'm looking for a material with as good or better absorptive properties as Corning Owens Rigid Fiberglass for super low frequencies (10-100hz) but is stuffable (like regular cotton or fiberglass) and doesn't cost an arm and a leg. Anybody know an available product with these qualities?

23rd July 2007, 08:23 AM	#2
Inductor diyAudio Member Join Date: Feb 2006 Location: Cascais	Rockwool (?)... what is your idea? ...price only? (funny) you are not thadman from the thad-dance are you? __________________ What the Hell is this crap?! It's not crap, it's muzak.

23rd July 2007, 04:23 PM	#3
crazyhub diyAudio Member Join Date: Nov 2005 Location: alsace	I use Rockwool "rock-up b naked", h120cm x w60cm x t10cm for my low bass-traps. It has very high density and an overdensified face. Killing low-bass waves is very hard to get...Otherwise contact your sub-marine army __________________ crazyhub

24th July 2007, 12:06 AM	#5
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Could you possibly use a bass trap of some sort? __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

24th July 2007, 12:08 AM	#6
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	There are many kinds of acoustical absorbtion materials. Most of the ones I've seen have been based on paper pulp or rockwool. Do a search, loads of manufacturers will show up. There are different types for different frequencies, so you gotta measure where your problem is. Another point to keep in mind is that a room becomes unpleasent to be in, if it's too dead, which is fairly easily achieved. I have recently seen that happen in an other application for a "dead" room. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com


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23rd July 2007, 11:57 PM	#4
thadman diyAudio Member Join Date: Dec 2005 Location: west lafayette	Do you have any objective data regarding the rock wool? Are there various types? Where did you purchase yours? Have you compared it against Rigid Fiberglass?

24th July 2007, 01:23 AM	#8
noah katz diyAudio Member Join Date: Jul 2004 Location: Mountain View, CA	"Could you possibly use a bass trap of some sort? " "A much better idea, and both cheaper and easier as well......" I thought that's what he was describing. __________________ ----------------------------------------- Noah

24th July 2007, 01:33 AM	#9
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	A bas trap is not really a material, but rather an acoustic element that is tuned to resonate at a frequency range, usually pretty narrow. This coud be in shape of a sonotube or the like. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

24th July 2007, 01:36 AM	#10
noah katz diyAudio Member Join Date: Jul 2004 Location: Mountain View, CA	I know, but he said 10-100 Hz. OTOH his room probably only has a few modes in that range so tuned traps might make more sense, though I've never heard of anyone actually using them; too hard to get right, I think. __________________ ----------------------------------------- Noah

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