Justin,thank you for identifying a hum issue with the use of odd number(s) of channels using unbalanced inputs into the amp. How were you able to confirm that this is a "non issue with a pre that has balanced out"? I have 7 channels connected to the A1400-8 using balanced outputs from the prepro and can say that the background is absoultely dead quiet even when I tested by putting the volume on the prepro way up.
EFalardeau, I assume the dummy zone 2 output on your 805 had audio output? Did you not connect a speaker to that channel on the amp?
I had heard somewhere that using all eight channels would actually run the amp cooler. This hum issue with odd number(s) of unbalanced inputs is also interesting.
John
