Originally Posted by Mojo
The theory therefore is a parasitic, common mode noise source in the ADA that arises from the ADA's input power and is somehow impressed on one or both of the ADA's input signal lines.

Is there something in the design that could solve this issue?

I just know that the hum I was getting before introducing the line filter was significant, but I could live with it, while this new level of hum is going to take away all of my home theater joy until I get it resolved.