Why would you think my mains are showing quite a rollof after 160hz in the initial sweep I do with sub muted? Is the sweep really rolled off there too; the demo screenshots don't show that to be true.

My first weekend with the SMS-1 and I love it. Figured out a few of the shortcuts and tricks, thanks to reading this forum, and it has helped the learning curve a lot. I am going to try and do the "sub at lp" exercise next. All I've done so far is move them out of the front corners along the front wall and it has helped tremendously. I'm also toying with a switcher that I'll describe later. Net/net, my room doesn't like it when I play through the processor (lfe/sub out to SMS) and also the fronts are augmented by the same signal (meaning second set of front stereo preamp inputs to SMS AND processor lfe input all at once). Right now I unplug one or the other when EQ'ing and/or playing stereo vs processor.