Have you tried a ground loop isolator on the cable to your cable box? Oftentimes adding one to a system with TV cable attached will cure hum completely.
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the TV Cable coax. First, the hum/lines disappear if I play the TV without the processor/amp. Second, the hum/lines are there when I play a DVD with the cable completely disconnected. So, it's got to be in the processor or multi-channel amp. But I tried everything with these pieces to no avail (Sigh!).
I guess I may have to disconnect everything and reconnect the system piece by piece, not something that I look forward to.
I can only repeat what is said above - Isolate the CATV-in from the rest of the system first.
I use the Jensen VRD-1FF, but I am sure there are others.
Once that is done, hook every component up to the same single electrical outlet.
If you still have hum, start connecting and disconnecting everything (both the electrical plugs and the cables) until you can find the source of the hum.
The cable box was the first thing I disconnected but, as I said before, that wasn't the problem as Rex and Swampmaker suggested.
Unfortunately, with all the high-power components in the system (amps, powered subwoofer, TV and several transformers/conditioners), it is not possible to hook everything to the same AC outlet as Riffer recommended without overloading it.
I guess I will have to find this gremlin the hard way: float everything except one common ground (processor) and check every single AC polarity for the lowest noise.
Any other options?