Check if all components use pin 2 hot and pin 3 ground. I would suspect that one amp deviates from this configuration. Also since purchasing my VAC Renaissance preamp which is truly balanced operation, I find out that my Sony cd player and my Classe amps that utilize balanced connections are really not truly balanced as far as operation so maybe you have one component that is truly balanced with others that only have balanced connectors. The VAC has a switch which changes the grounding for the type of operation ie truly balanced or just balanced connector. If the ground switch is incorrect it can hum and or reduce output.
hum Being caused by ??
hello I have a hum when I connect my Audio Aero Capitol Mark 2 to my main upper range amplifier only when using balanced Interconnects. was previously using the balanced output into the bass crossover/amplifier and the RCA output into my main range amplifier which results in no audible hum whatsoever I'm using the same Interconnects both ways. The player has its own dedicated circuit as do both amplifiers. its definitely not a 60 Hz ground loop hum. also purchased new balanced cable today it didn't help the hum. Any suggestions? Thanks