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Message: <blockquote data-quote="PV Audio" data-source="post: 6498263" data-attributes="member: 554493">As far as ported enclosures go, poly fill is one of the least common used filling materials. Fiberglass and Dacron are far more common for soaking up standing waves and tightening up bass response. Poly fill is used in sealed enclosures because as the fibers vibrate as the speaker oscillates, the vibration creates heat which lowers the air density in the enclosure. The lower air density simulates a larger environment, thus fooling the speaker into thinking it's playing in a larger enclosure. It's used to knock down peaky response in small sealed enclosures which can tend to be boomy if you don't have enough room for a proper sized enclosure.Note: Dacron is simply synthetic pillow stuffing and even though they look similar, Dacron and Poly-Fill are NOT the same product nor do they really perform the same.</blockquote>

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