Brianam 03-14-14Are the symptoms consistent between CD playback and playback from whatever sources are feeding these inputs?
Am currently using both of the 840C's digital in's.
Also, one thing I would try before replacing the 840C is changing its connections to the preamp from unbalanced to balanced or vice versa, as applicable. For that matter, doing likewise for the connections between the preamp and the new amp.
Regards,
-- Al