Yesterday, I had the house to myself for a rare moment and decided to inaugurate a new SACD of Schubert and Dvorak from Telarc. Recorded at a live venue in England, in DSD, I assumed a high quality recording. I decided to push the volume level beyond my usual -25dB from reference (calibrated w/spl meter on my THX Select Integra DTR 6.4--I point out THX only because the test tones are pre-programmed at 75dB on the receiver, as per THX instructions in the manual). I've read about people listening to classical music at "performance" volume so I pushed the volume to -15dB. The sound was not very good and the instruments seemed smeared. At lower volume, everything was fine. I tried some other discs and, with one exception (Alison Krauss and Union Station-Live), none of them sounded great at that volume. The receiver didn't clip but seemed to run "out of breath". Could this be because some m/c music discs make greater use of several channels simultaneously, thus straining the amp in ways no movie has yet done? Are my amps a lot weaker than I believed? Could it be the player (Marantz DV6400)? Are the speakers (rated to take a lot more than my receiver dishes out) not up to the task? I ask, not because I intend to listen at that volume on a regular basis, but because I believed the greater dynamic range of hi-res music allowed for a clearer, cleaner sound at louder volumes than regular CD.