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Re: Room Treatments
Thasp #423251 02/09/17 06:46 AM
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axiomite
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axiomite
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Originally Posted By Thasp
Have you considered trying owens corning 703 instead of wool? Much better absorptive properties.

I originally started looking for 703 but it seems to be fairly hard to find in Canada, while the various Roxul products were broadly available. I did some poking around in absorption vs frequency values and IIRC Safe & Sound was pretty similar to 703 although 2x the thickness.

Roxul also makes a semi-rigid that I am using in a few places (guess I should get around to covering it with cloth eventually) but most of it is still in the wrapping acting as a bass trap in a hallway where a lot of bass seemed to be piling up. Nobody seems to talk about implementing bass traps by dumping a bale of fiberglass or rockwool in the corner (hey it comes wrapped in a free membrane), probably some petty aesthetic thing.

I need to get some treatments up in the HT area so will do another look around to see if I can find 703 this time.

Last edited by bridgman; 02/09/17 06:50 AM.

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Re: Room Treatments
2x6spds #423278 02/11/17 05:36 PM
Joined: Aug 2004
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axiomite
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axiomite
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Sorry, that "2x thickness" wasn't right - 3" S&S seems to perform between 2" and 3" OC 703, and closer to 3" if anything:

Code:
Product 	 	density 125hz 	250hz 	500hz 	1000hz 	2000hz 	4000hz 	NRC
RXL 80 		1.5"  	8.0 pcf 0.21 	0.64 	0.92 	1.00 	0.95 	1.01 	0.90
Safe‘n’Sound 	3"  	2.5 pcf 0.52 	0.96 	1.18 	1.07 	1.05 	1.05 	1.05

703, plain 	1"  	3.0 pcf	0.11 	0.28 	0.68 	0.90 	0.93 	0.96 	0.70
705, plain 	1"  	6.0 pcf	0.02 	0.27 	0.63 	0.85 	0.93 	0.95 	0.65
703, plain 	2"  	3.0 pcf	0.17 	0.86 	1.14 	1.07 	1.02 	0.98 	1.00
703, plain 	3"  	3.0 pcf	0.53 	1.19 	1.21 	1.08 	1.01 	1.04 	1.10

source

I am actually using Comfortboard IS rather than RXL 80, but apparently the two have very similar behaviour.

One thing I don't understand is that the absorption coefficients don't go up that much at high frequencies as thickness increases, but I was also under the impression that adding layers would more or less result in adding the absorption coefficients. I guess the latter belief must be wrong ?

Last edited by bridgman; 02/11/17 05:43 PM.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8
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