Updated Room Response

So here's 10 frequency response measurements taken from the listening couch overlaid. Next is the average and followed by the decay time from each position and then the center of the couch--primary listening position. I gotta say I am pleased! This is the best sound I've ever had. Things are indeed looking up. The most audible defect is that 140Hz spike.

Mackie spectrograms

Just another look at the Mackie HR624 mkII's diffraction.

Mackie HR624 mkII

These are my standard measurements on this Mackie monitor. The nasty top octave isn't detrimental for me one bit. Also the vertical lobe is a bit narrow, but again doesn't seem to be a problem. Diffraction is excellent as is the off axis response. With the bass set to flat, it's a bit heavy, but stepped down a notch and it seems perfect. Overall I'm impressed with the sound.