buzz/hum from tv

I have a similar problem.
I isolated it very clearly to the cable source. I disconnect it from the TV, the hum goes away; connect it and the speakers hum.

Comcast came in and confirmed their cable is carying "a high signal". Its something they had to fix at the pole. After 6-8 weems and numerous visits and even more calls they haven't done what I've asked them to do: provide a cable "isolater" or "attenuator" device that will eliminate the problem. My local high end audio shop has a "Magic Box" that will solve the problem but I want to see Comcast solve it. If they can't then I'll switch to DirecTV or Dish and get the Magic Box

-s

Tim (Flemke), thank you for your note. It didn't help though (see below).

Paddlersean, like you, my TV is about a dozen years old too. My hum, however, is directly connected to the cable feed.

Comcast confirmed their cable is carrying a "very high signal", 20 . Normal is about 5-8, they say. The guy that came in yesterday brought along an attenuator. Using it lowered the hum some but didn't eliminate it. It however resulted in very degraded picture quality.

After eight weeks of this dance I finally gave up.
I cut my Comcast service.
Result? No hum. I don't have to worry about my speakers frying slowly in my presence and absence.
Side-effect? No cable service as well. I get to read, think, and do good more now! Oh, the $49/month savings is good too!

Comcast couldn't solve the problem. When I get around to it I am taking my money and account to DirectTV or Dish.

-s