Well, it took a while but I think my ground loop hum is finally gone. Funny thing, though. Everything I tried seemed to work for a while but then it would creep back. I tried to kill it at the cable tv by using Jensen's VRD-1FF. This seemed to work for a couple of days but then I noticed the hum again, albeit much lower than previously. Next I added a cheater plug. This worked great but it had me nervous as I have three young girls and didn't want them to have unaturally spiked hair. I went back to Jensen and purchased their SUB-1RR. It arrived yesterday and I installed it last night. Didn't take care of the hum. After thinking about it for a while, I decided to remove the VRD-1FF from the cable line and remove the cheater plug. Whammo! Humm gone.
The only thing I had to do next was recalibrate the sub. Now I have great sound, no hum, and no thumping during input switching.
These things sure let you know how anal you really are. At last. Now I can sleep...
