OK, here are the results of last nights efforts!
First up, my "baseline" - all 4 subs, no mains:
After tweaking the 2 rear sub's distance with Mini DSP - ended up at 3ms:
I then added in the mains and tweaked the sub distance in the AVR - I tested all the way from 0' to 20' in 1' increments. 5' and 19' gave the best traces.
Purple is 5', blue is 19':
This is where I think I messed up a little. It may be a "six of one, half a dozen of the other" type of thing, but I thought the 19' trace looked a bit better than the 5' trace and decided to use the 19' as my base for EQ.....then I forgot to change the distance in the AVR
before I EQ'ed, so I ended up using the 5' distance.
Anyway, here is the trace after EQ:
Before (purple) & after (red):
While EQ'ing and listening a bit, I was still hearing some of that "sloppiness" down low so I went in and changed my House Curve from "20 6, 80 0" to "30 5, 80 0" and that sounded much tighter down low - My theory was that I was getting too much room gain around 30hz and bringing it down might help with the resonance. This was a great improvement, but I was still getting some weirdness from 100hz to 150hz so I raised the "EQ Cutoff" in REW from 80hz to 120hz and it smoothed it out with a filter at 115hz.
I sat down and had a listen. It was late and the wife was asleep so I couldn't really crank it up, but at moderate levels it sounded outstanding! The bass in music was extremely tight and detailed and watching the opening two scenes from Pacific Rim never sounded as good! I'll need to crank it over -10 tonight, but I really think my issues have been solved! I really think getting the distances tweaked just right made a huge difference. Thanks Luke!!
I do think that I'm on to something with the change in the House Curve - I may even flatten it out more and see what I get....I think that my room, with that natural resonance right around 32hz, is making me really tone it down in that area. Previous to this, I thought that the steeper the rise from 80hz to 30hz the bettter (I've had it as steep as 12db, now around 8db) , but now I'm thinking maybe the more I tone down around 32hz, the better....?
BTW, have I mentioned how much I love the Mini DSP??