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Old 03-25-2012
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Re: Acoustic Insulation for engine room?

I used to do a lot of audio recording, and while I never got too far into sound treatment, I was always told that the thing that stops sound is mass. I'm not surprised that some of the other people in this thread had the best luck with lead. A lot of music studios and things use soft sound treatments, like foam, fluffy fiberglass or rigid compressed fiberglass panels, but they're doing that more to "tune" the room by lessening echo and preventing the buildup of certain frequencies when instruments are being played and recorded in there, not to sound-proof the room. Although every little bit helps, going with something less dense will likely block proportionately less sound. At least theoretically.
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