Good question. I'll have to check that out. I'm listening to an SACD now, and it seems kind of loud to me. My SPL meter (set to C weighting and fast response) is measuring under 60 dB most of the time, but it peaks between 62 and 65 from time to time. Heck, I just turned it down 5 dB after typing that.
I'm sitting off to the side next to one of the front speakers and sub, though (but that's where I'm measuring).