Sounds like a ground loop problem. I had a similar one. Audio Advisor sells a Mondial MAGIC cable TV hookup that deals quite well with this problem. Sells for about a $100.
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I'll 2nd Flyguy. I had the exact same problem. I installed the Mondial Magic into the system and all unwanted noises stopped. I haven't heard of any other product that fixes this problem. I dropped cable and got a satellite dish. Didn't have to keep the Mondial in the system after installing the dish. Good luck.
Hi--Thanks for all your great advice. To followup: 1. I ordered and installed the Madrigal M.A.G.I.C. and it eliminted the power hum. 2. I had the cable company come out and check my groud. Seems as though when the @home cable guys installed my internet cable they didn't re-ground or else changed a ground or a lead or something. The regualar cable guy did something (at least he told my wife he did) to eliminate the hum. 3. Now I am left with a speaker hiss in the system. Just enough to be noticeable at low levels. I'm investigatin power conditioner and balancers and I'm really confused: Bybee Power Conditioners and Quantum line filter; CinePro Power 20, Tice Power Block III, Richard Gray The Power Company, PS Audio. I have a Monster MTS 2000, but it's not doing the full job. What way to go? Any ideas or your experience would be appreciated. Thanks
The cheapest way to eliminate cable tv hum is to add a drain wire to the coax shield. Here's what you do: Remove F-connector from coax. Attach a 18ga. copper wire to the coax shield. Crimp on new F-connector. Attach other end of drain wire directly to your copper cold water pipe. If dedicated earth ground is used add drain wire to a 3 prong ac plugs ground pin and plug directly into wall outlet.