The music on feature for the M-200's is nice because when I listen to stereo music, the rest of my M-200's go into stand-by. I have timed the auto shut-off and it seems to be around the 15 minute mark. The only downfall I see is when I am watching TV (in pro-logic) and the source program has a poorly recorded or mono track, the left and right channels will shut-down. Then when a commercial comes on, the amps fire back up! However, this is not the fault of the equipment, just rhe programming material. To fix this issue I just trigger the fronts, because I always use those, and set the other M-200 to use the music detect function!

Just food for thought,
-BL