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Thank you. I disconnected the cable box, unplug it from the wall, now I connected the cable straight to TV, the hum is still there (the only wire that link to the system is the hdmi cable from Bluray player to TV). It is the cable tv line that cause the hum not cable box. Will the isolator fix this? thanks again
Be aware that isolation devices can introduce little gremlins that will mess with some channels if you have digital cable. I had a Time-Warner tech come out when I first moved in because I wasn't getting several channels that I should have been - he isolated the problem as the Mondial Magic I had in line between the cable outlet and my cable box (which is connected to my DAC via toslink).
I felt pretty stupid, but then again, was totally unaware that those isolation boxes can cause such problems with the newer digital TV boxes (was a non-issue with the older, non-digital boxes I'd had in the past).
A few minutes of your time could save you $50.Not sure about the return policies of the two retailers linked in this thread, but I know Jensen Transformers offers a 30 day return for items purchased directly through them.
I *believe* Markertek's policy is the same, but check it to be certain before purchasing.