Date: May 08, 2001 at 23:24:06 From: ttriff, [hh1096003.direcpc.com] Subject: You should do some research
regarding the absorption co-efficients of various materials.
Fiberglass has a lower absorption rate below 200-175Hz compared to the synthetics, polyfill, dacron etc.
The reason it's used, is that has has SOME absorption of bass, it's cheap, and it does a good job with the higher frequencies that end up in the sub as a result of the roll off rate of the XO.