I didn't realize this was such a common problem as it's the 1st time I've ever experienced it. Guess I've been lucky. Thanks for pointing me to a solution.

Out of curiosity and cheapness , is there anything I can do with my existing wiring/grounding to resolve this? I have my cable signal split to feed my small upstairs system and the Axiom HT in the basement. I do not experience this hum upstairs.

Dan
On-Wall M5HP LCR, QS8 & EP500 in 7.1