Jason, the boominess comes from the speakers. Really noticeable with two-channel listening, during which I don't run the sub. I like the boom during movies! (insert sheepish grin)
And, JohnK, my speakers play pretty low (less than 30Hz) and I erroneously thought that putting them too close to the wall would accentuate that. Sometimes, it's okay to be wrong!
*********** "Nothin' up my sleeve. . ." --Bullwinkle J. Moose