Does anyone experience a hissing sound from their stereo, specifically mark levinson. The hissing sounds occur from certain songs and when the engineer rpms are around 4500.

 

No I don't hear a hissing noise, but I have noticed that the auto sound level DSP option messes with the EQ and volume at different speeds (on my system it makes music more sibilant sometimes). Try turning that off and see if it stops.