Polyester Fiber

[nicker10 10+ year member]

Was going to put some polyester fiber in my box but should it be glued on to the inside of the box? Just asking because wouldnt it come out of the port?

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[Chrispy 10+ year member]

Never heard of or seen anyone use polyfil in a ported box. It's generally used in sealed boxes to make the sub think its in a bigger box.

 

[fasfocus00 5,000+ posts]

when used in a ported enclosure you'd want to use contact cement to get it to adhere to the walls. poly fill is very common in ported enclosures but it's main in home theatre b/c in car audio everyone is usually trying to squeeze out every db they can and addy poly fill usually reduces it by ~1-2 dbs. that's nothing you could hear.

 

[PV Audio 5,000+ posts]

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.