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Message: <blockquote data-quote="Trixter" data-source="post: 3122014" data-attributes="member: 542668">the polyfill will make the sub act as if it were in a larger box (1 pound  / cu' is what is recommended) however, if thoses boxes are tuned to say 50hz and you need it in the 30's, polyfill isn't going to make that much of a difference in tuning...only like 1-2hz.my suggestion would be to build a box yourself, using the prefabs as a model for the external dimensions and then tune from there. you may end up with less air  space than what the subs require, but that something you'll have to live with.</blockquote>

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