This is a different slant. I had standing waves that correlated very well with the room dimensions. I installed a lot of absorbers which helped somewhat but Physics is phsics and I still had standing waves, I opted for a subwoofer and a crossover for it (Velodyne SMS-1 but there are cheaper units see The absoute Sound article by Greene). This enabled me to move the subwoofer for best bass response without messing with the main speakers. It is more expensive than panels but will give you very good results.
Bass Trap help
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My room sorta looks like this with the total length 25'
Im getting a rather large peak at both 63 and 80hz using warble tones and a Radio Shack sound level meter. The right from the listener opens into a kitchen. Anyway. I bought 27-Owens Corning 703 2"x24"x48" panels. Surely this is enough material? Stacking the panels 3 deep for 6" deep panels, that gives me 9 panels at 24"x48". Ive been moving them around, first trying 2 in the front corners, 1 to each side of the speakers, 3 to the rear (dead behind and one to each side, and the lasy one the wall to the left of the listening position. Zero different as read before and after using my meter.
I dont understand.
Help