Re: Foam for SASS

["Avocet" madl74]

> The plans say to use high-density open-celled foam, and I don't know
> how to identify the stuff.

Peter,

You can't blow through closed cell foam. Sound will reflect off it as
if it was a plastic surface. You don't want that. You can blow through
open cell foam which can vary in density. The more open type is used
in windshields. More dense open cell foam absorbs sound and this is
what is called for.

Have a listen by holding various bath sponges to your ear.
Commercially what you want is higher density sound absorbing open cell
foam (more resistant to being blown through), but if you stick
together several layers, make them edge on. Test samples by listening
to them.

David

David Brinicombe
North Devon, UK
Cogito cogito ergo cogito sum - Ambrose Bierce