View Full Version : closed cell foam vs polyfill

09-07-2009, 09:00 PM
polyfill and closed cell foam are the choices? i want to line the inside of a ported box. I have some left over closed cell foam from a poker table that I built. will the closed cell foam (1/4" thick) slow down the back wave like polyfill or will it just muffle/absorb the wave? or will it do something completely different?

Blue Fury
09-07-2009, 09:08 PM
I've read it just takes up volume. I've tried it and there was almost insignificant sound difference. It was just that little bit better without it.