Originally Posted by cdy2179
Some of the best HTs on this forum have 1" and 2" Panels and are designed by very knowledgeable guys like Erskine. If you look at the specs for any given material you'll see the absorption coefficients at given frequencies. This proves you are just fine with 2" or 1.5" against a wall. Much lower and you're talking bass trapping (corners and tri-corners). Also the side walls are reflected at angles not straight on so the angle of incident must be accounted for and you'll absorb even lower as the waves travel through more material. I use 1.5" with 2" in the back and with confirmation via REW of rt60s going thicker wasn't needed.
Of course I'd incorporate some combo panels like BAD or TAD or DIY versions at least on the side walls.
Thanks for the info. What are TAD and BAD
Home Theater and Home Automation Enthusiast