Axiom Home Page Forums General Discussion Home Theater Acoustic Treatments/ Soundproofing.

for a start, you could try here:
http://www.realtraps.com/art_room-setup.htm
http://www.ethanwiner.com/acoustics.html#diffusers and absorbers

i also think that decoupling the sub from the floor is a very good thing to do. this will give you cleaner sound, less distortion;
by that, i mean if everything in your HT room shakes, those sounds are ADDED to the original recorded sound, and they don't belong there; same as strong reflective walls for the high and medium frequencies. it muddies the sound.