Thanks guys! (Tom - I should have never used the sense of scale term! The screen is 126" diagonal)

I took a break to let you know that the Audyssey setup came back with recommending the center at 0db, and the M80s at +1.5db. It chose all front speakers (mains and center) as large, with a 40Hz XO frequency (100Hz for the QS8s). I gave it a go for a couple of songs, and it's was like taking cotton out of my ears. The bass is much tighter than before, and the vocals are stunning. I do not run the system with Audyssey (I always choose no room eq), but I use it to easily set my levels and XO points.

Simply amazing speaker.
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2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos