Keep in mind when trying to even out the response to just look at one speaker at a time. If you play both of them at the same time then you can get peaks and dips caused by the time arrival differences of the two speakers and their room reflections.
Yes, Danny, good point. The plot above was just the combined to show the effect, but I set the PEQ for each A370 independently to flatten each channel first and then also measured together.
BTW, removing the MacPro from my room has drastically reduced the noise floor (and amount of heat generated). I'm down to about 35.5 dB(A) and NC 32, which is pretty quiet. I don't have measurements from before removing the tube amp, adding the Mod-86 (going balanced), removing the noisy sub outs of tube amp and removing all the fans, but I figure close to a 6-8 dB drop in the noise floor.
Now I can hear the following:
* spinning hard drives (SSD boot drive, but 2 HDD backup drives, which can be heard if they are spun up). I've moved all my loseless music to a SD card, which is plugged into the Mac Mini, it is silent).
* Slightest transformer hum from each A370 amp.
* Some hum 60/120/180 components from the servo subs (acoustic, not electric).
* Slight hiss from co-ax.