The hiss that was once a source of great debate for the 950 was independent of volume -- it was as audible at -70dB as it was at +10dB. What you are encountering is a different beast. There will always be some hiss in a system when the volume is at the upper end of the range (such as the -10 to +10 range of the volume control), but you may also be picking up some interference in your wiring. You might check to see if there are any power cords routed too close to interconnects or speaker cables, and if there are, try to re-arrange things to provide some separation.

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