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Message: <blockquote data-quote="DNick454" data-source="post: 5985980" data-attributes="member: 600755"><p>The reason you got louder and lower is because polyfil makes the sub think it is in a larger enclosure. So by adding it, you increased the net volume and lowered the tuning in a theoretical sense. That's why it's used in small little sealed boxes to get the low end, and in Transmission Line boxes so they don't have to be like 50 ft long, etc.</p></blockquote><p></p>

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