Make sure the whole system is on the Same Phase leg
if this is hard to understand
Just take one power strip plug it in to one ac outlet and plus the (( whole system Everything)) into the strip to see if the hum is gone. If you have Cable TV in the system indirectly connected then disconnect the Cable TV at the wall and let us know what happens.
Johnnyr
if this is hard to understand
Just take one power strip plug it in to one ac outlet and plus the (( whole system Everything)) into the strip to see if the hum is gone. If you have Cable TV in the system indirectly connected then disconnect the Cable TV at the wall and let us know what happens.
Johnnyr