I know this issue has been addressed in detail but I have an interesting situation and wanted some advice. I know I have ground loop issues. I've always had bar on tv and hum from tv. Doesn't bother me much but i'll address it soon. My issue now is that I just hooked up my Rotel rsp 1066 to my system and now i'm getting nasty hum from all speakers. Before i had sony es 30 receiver, rotel rmb 1066 amp and no hum at all. Now i have rotel rsp 1066, rb 1070, and rmb 1066 and getting the hum. I don't think the ground loop from cable tv is causing this since it never affected my sound system before. Am I missing something here?