Hum problem

Checked cable junction box outside the house, I opened the box and found that they forgot to hook up the ground wire. I hooked up the wire, no more HUM!!!!! Great advice Bob. Thank you everyone for all your help.

@ellyjr Jensen makes ISO-MAX.

It is a very good product line. Jensen uses transformers for the isolation function. You may want to inform yourself about the limitations of transformers in audio systems. Not that transformers are inadequate for audio, not at all. I use several at different places in my system. However, there are limitations, as is true for any component.

Jensen provides schematics for creating different kinds of isolation and conversion (SE to XLR, for example). I have built a few fom their schematics. They do the job very well.