What is Polyfill and Why Should I Use It? - Sonic Electronix

Learn all about how you can get more from your sub woofer using Polyester fiber fill when your box is smaller than what the subwoofers air space recommendations are. After you install the subwoofers, the enclosure will appear to be larger than it really is, bringing you maximum sound quality! the purpose and advantages of Polyfill in this article to ensure you get the best audio quality from your car subwoofers.

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What is a Polyfill?