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Re: sub box question
Polyfill works by dampening internal resonances, which helps to keep the box from vibrating and reducing the strength of the wave outside the box. and also to provide a little xtra volume inside the box. My prefered insulation is air conditioning duct board. it is 1" thick..or 2" if u can fin it and it is easy to cut and form to the inside of the box. keep the silver side on the wood. it can be found at most air conditions supply stores and is not to expensive....
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