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Message: <blockquote data-quote="Volenti" data-source="post: 2045213" data-attributes="member: 566487">The change in resonant frequency (apparent enclosure volume increase) is actually pretty small, on the order of 2-3hz, it's the increased damping that the fill provides that causes the change in the subs sound.The air in the sealed enclosure acts like a spring, when you add fill to the enclosure it acts like the shock absorbers on your car, restricting the movement of the "spring".note; a well built enclosure with no fill can be up to 3db louder than a filled one, just keep that in mind.</blockquote>

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