Originally Posted by
RMC
In the past I always used insulation type fiberglass in speakers. However, sometime ago I started purchasing polyester instead.
Insulation type fiberglass seems to have too many fibers flying in the air when manipulated or vent passing a good amount of air, unless its wrapped loosely in one layer of cheesecloth before tacking it in place or sprayed a little with some spray paint. Polyester doesn't appear to have that fiber issue.
So I'm slowly replacing the fiberglass in all my DIY boxes with 1-1½" polyester sold by Solen as well as others.