I don't believe it has anything to do with mass (I'm no expert tho). Sound
gets reflected and absorbed everytime it hits something. So something light,
like foam insulation, has lots of air holes to reflect and re-direct the
sound, and is soft enough to absorb some, while a heavy piece of 1/4" steel
passes the sound along very well.
----- Original Message -----
From: "Barrie Robinson" <firstname.lastname@example.org>
To: <email@example.com>; <firstname.lastname@example.org>
Sent: Friday, September 07, 2001 10:12 AM
Subject: Sound proofing
> I am currently looking at soundproofing and trying a closed cell poly
> foil backed product. It has high raised bumps on the foil side so that
> even when stuck to the metal air can circulate thus preventing rust. Has
> anybody got any experience in such products?. I would like samples of
> Moss Dynamat stuff if someone is generous enough to mail a small sample.
> ...and samples of anything else - plus price paid. Then I will publish a
> comparison. The stuff I have is pretty thick and costs Can$80 for two 4'
> 6' rolls.
> One thing that puzzles me - my understanding is that mass stops sound thus
> light products should not do much for sound proofing BUT foam will stop
> reflection of sound so......???? Any sound engineers out there?
> THANKS IN ADVANCE AND PLEASE ANSWER OFF LIST TO REDUCE TRAFFIC
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