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In Reply to: RE: Bass trapping behind walls? posted by Bayside Bomber on June 04, 2008 at 16:44:08
For bass trapping the insulation needs to be dense and preferably have an air space behind it.
My original bass traps were DIY made with relatively low density insulation batts that were compressed in a wire cage to a density of 2 lbs per cu. ft. They worked reasonably well with clearly audible benefits. At one stage I took them apart to make a modification and, simply for interest's sake, I had a listen with the batts completely uncompressed in their normal 'loose' state. The benefits in the bass that the traps had provided when the insulation was under compression simply disappeared and the quality of the bass I was hearing deteriorated. At the same time the loose batts were also much more effective at absorbing high frequency sound than when they were compressed and the high frequencies sounded worse because there was now too much absorption in the high frequency range, killing the liveliness of the music and making it sound dull.
The results with the loose batts in the room were actually worse than having no treatment in the room because the original low frequency problems simply returned but a new problem not present in the untreated room was introduced in the high frequencies.
Don't stuff the cavities with loose insulation. You need to use insulation with a density of somewhere between 2 to 6 lbs per cu.ft and if possible you want to leave some air space behind the insulation in the cavity in order to improve the low frequency absorption of the insulation.
David Aiken
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