To pick up on my earlier point about room response and its relevance to this issue, you can see the difference between an 80Hz and 40Hz receiver cross-over for my room right here. The blue trace is with a x-over of 40Hz while the red is 80Hz. You can see that the 80Hz setting has pulled up two nulls at around 78Hz and 90Hz. I've used a 40Hz setting for music because it sounds less "boomy" but after running the 80Hz test, I think the boominess is a result of having my LFE gain turned up too high( Yes Randy...still too high ). I haven't quite figured out yet why these two nulls are ocurring in my room. Other nulls are ocurring due to comb filtering as a result of a wall located about 10 feet behind my listening position.

I'm bound and determined to smooth out my room response without using "artificial" sound treatment .