OK, so last night I set up to do some measuring and to try some different crossovers on my mains per Craig's suggestion. Keep in mind this is the first time I've ever measured my mains by themselves...not sure why I'd never done it before, but whatever.
I found out that I'm sitting directly in the center of a giant 60hz null!
Check it out. This is just FL/R speakers, set to large, Audyssey off:
And here it is compared to some varying distances in front of my MLP. My MLP is currently 5' from the back wall where the picture window is:
2' in front of MLP - Magenta
3' in front of MLP - Blue
4' in front of MLP - Red
Smoothed to make it easier to compare:
Just to verify it's a null and not my speakers, here is the FR of the LFE only, same suck out right around 60hz:
So, it's no wonder I've been having headroom issues since Audyssey is boosting the sh*t out of 60hz....the distortion is 7.65% @ 60hz! Can't imagine how much amp power it's eating up for Audyssey to boost that region by ~10db. This is mains + subs, Audyssey on:
I tried moving the KHorns out of the corners about a foot or so and the null didn't change at all....seems like the only thing that is going to fix this is moving my MLP and that is just ruining my mood right now. The room just ain't gonna look "balanced" if I move everything forward (at least 2', but 4' would be better).
May have to think about rotating the whole setup so that the screen and mains are on the long wall....really don't want to do that though, it's a lot of work and it's really gonna mess with my feng-shui...especially if I end up in a similar situation and it was all for naught.
Not sure what I'm gonna do in the future, but for now I think I should run Audyssey a couple feet in front of the MLP just so it isn't boosting that null and straining my system.