I should clarify that-fronts using Audyssey were originally set to large for everything, but I changed it so that they are set to small and crossed over at 80hz for mutichannel, but set to large for stereo as I prefer the fuller sound.

I don't really understand the term "headroom", but I thought by having my sub volume up a little more (it is just under halfway) it would lessen the strain on my receiver during HT, no? Better to have channels set as close to zero as possible?

Should my front and surround channels be increased to aprrox. +3 and -3, keeping them closer to zero, and then the master volume would be a little lower to reach reference level? Or just trust Audyssey...