update - ran diagnostics last night:
the sound/speaker test runs through a sample of a spkr sample tone and then 4 or 5 ROMS, one titled music, the others titled voice
although there were no voice callouts tested? just sounds from each ROM
anyway - the tone test sounded perfect, the "voice" ROMS were fine if not just a bit scratchy - but nothing of note
however the "music" ROM - had a very high level of hiss, clearly stood out from the others - same hiss I am hearing during play
or when the machine is on but quiet, you can hear the hiss from the speakers from a few feet away in the room
I tested for ground loop, but its not that, and doesn't sound like a ground loop "hum" anyway, its more of a hiss - still thinking noise ceiling
on the volume, 4 is about where I need to be, in contrast to the hiss once you get above 4,5,6,7 - the hiss is not noticeable
but on 1,2,3 the hiss is disturbing, again maybe this is not abnormal? I was under the cabinet adjusting feet levelers and the hiss from the cabinet spkr/sub was very very noticeable even when there is no audio playing at all. I do not have this on any other pin, even TAF doesn't have a standing hiss like that ??
I wish I could turn the volume up higher but at 5 - I was getting scolded from my wife upstairs in living room, that she could hear the pin over the TV
thanks all!
mike