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<blockquote data-quote="Moble Enclosurs" data-source="post: 7450504" data-attributes="member: 634917">In essence, yes, but this has a different effect on the overall sound than a properly constructed design without it. Normally, polyfill is more desired in a sealed enclosure for tuning purposes, or transmission line enclosures for LF output at the opening while dampening the HF from the rear wave for proper reproduction. In subwoofer designs other than sealed, which is based mainly on the Q factor, is not necessary for tuning. It will also, likely not do much to the tuning if the desire is to lower it by many frequencies, rather than a few(1-6Hz band).Best bet is to properly construct a compression area and port volume for the desired frequency range, rather than tuning frequency, as the tuning frequency has minimal relationship to the entire response, unless the desired goal is SPL output alone.I will not say do not do it though. Most of what we know today is based on trial and error.</blockquote>

[QUOTE="Moble Enclosurs, post: 7450504, member: 634917"] In essence, yes, but this has a different effect on the overall sound than a properly constructed design without it. Normally, polyfill is more desired in a sealed enclosure for tuning purposes, or transmission line enclosures for LF output at the opening while dampening the HF from the rear wave for proper reproduction. In subwoofer designs other than sealed, which is based mainly on the Q factor, is not necessary for tuning. It will also, likely not do much to the tuning if the desire is to lower it by many frequencies, rather than a few(1-6Hz band). Best bet is to properly construct a compression area and port volume for the desired frequency range, rather than tuning frequency, as the tuning frequency has minimal relationship to the entire response, unless the desired goal is SPL output alone. I will not say do not do it though. Most of what we know today is based on trial and error. [/QUOTE]

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