I have a Denon 1712, and Audyssey automatically calibrates where 0dB is reference. My understanding is that 0dB, or reference, is the level where the movie producers want you to listen at. I cranked it up to 0dB for a movie to try it out, and it is *ridiculously* loud.
Is my understanding of reference wrong? 0dB is so loud its uncomfortable. -30dB is comfortable and sometimes I turn it to -25dB if I want it loud.