I'm almost certain I've seen this topic here before but I can't find it by searching. I have just hooked up my receiver to the TV, and when I plug the coax cable into the TV I'm getting a loud hum/buzzing from the sub. Seems like a ground loop to me, and I'm looking for suggestions on getting rid of it.
Is conversion of the signal from 75 ohm to 300, and back again, the first thing to try?