Thanks for the welcome guys!

JimP - OK - I set the back EQ switch to BP - thanks! Have also defaulted to setting the front EQ switch to Off. M80's very full and clean across the spectrum. No boost necessary.

Sweet Spot - Thanks for the attenuators tip - the 'play' in the volume control is really no biggie for me - I just turn it louder than I want then gently dial back/down to the desired listening level.
I look fwd to hearing how you like your 2150 (any day now!).

Gotta say things have never sounded so good around here!