There are quite a few threads that deal with this issue and take you through a step by step diagnosis to help isolate the cause. You may want to do a search on 'hum'.
I would first disconnect the tv cable and see if there is any change. If the hum goes away or is diminished then you need to isolate the cable tv ground from your system. A cheap and very effective way to do this is to buy a 75ohm to 300ohm cable converter and a 300ohm to 75ohm cable converter. Chain them together (75ohm->300ohm => 300ohm->75ohm) and hook up the 75ohm connection of the 300ohm to 75ohm converter to your tv or cable box. Hook your cable tv up to the 75ohm input of the 75ohm to 300ohm converter. These parts can be bought at RS for around 6$.
Just one other note, I briefly owned a Parasound 2003, and currently own a Parasound 2205. I've had serious ground loop hum problems with both amps and have resorted to lifting the ground in each case. Good luck.
I would first disconnect the tv cable and see if there is any change. If the hum goes away or is diminished then you need to isolate the cable tv ground from your system. A cheap and very effective way to do this is to buy a 75ohm to 300ohm cable converter and a 300ohm to 75ohm cable converter. Chain them together (75ohm->300ohm => 300ohm->75ohm) and hook up the 75ohm connection of the 300ohm to 75ohm converter to your tv or cable box. Hook your cable tv up to the 75ohm input of the 75ohm to 300ohm converter. These parts can be bought at RS for around 6$.
Just one other note, I briefly owned a Parasound 2003, and currently own a Parasound 2205. I've had serious ground loop hum problems with both amps and have resorted to lifting the ground in each case. Good luck.