Only polyfill works????

I've heard some people say it makes a difference and others say it doesn't. I personally use polyfil in all my boxes. I think it does make them soud better, to me the bass seems more solid and less boomy. I guess the gerneral rule is about 1 pound per cubic foot, but with a sealed box I usually just fill them totally except for around the sub. I don't mean pack it in there until you can't fit anymore, but still enough to fill it. For ported boxes I usually staple a layer over the whole inside of the box, except for in and around the port. Coating the inside with spray glue can help hold it in place as well. I guess you could use other materials as well, they do make a stuffing just for use in speaker boxes, but polyfil is cheap and easy to find. The opinions are varied, some people say its a waste, I always use it. Listen to your system with and without it and see what you think.

Filling an enclosure with polyfill, pink fiberglass insulation or Dacron batting will fool the sub into thinking it's a larger box . Filling an enclosure can allow for approx. a 20 % smaller box due to it's thermodynamic capabilities.Jeff

Velocity Custom Home Theater

Mobile Audio/Video Specialist

Morden, Manitoba CANADA