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Is there a certain amount of poly fill needed for a given box and speaker size
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upgrade audio system nissan juke 2014 1.5dci | Nissan Juke : Juke Forums
Amazon.com: Acousta-Stuf Polyfill Speaker Cabinet Sound Damping Material 1 lb. Bag : Musical Instruments
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DIY ported subwoofer - polyfill or foam? : r/hometheater
