If the cable tv has audio out jacks, or if you have a cable box with an optical audio cable, plug either the audio jacks into the RCA system or the optical audio cable, and the system should automatically simulate 5.1, through Dolby Pro Logic II. All speakers will not be at the same volume as they are simulating surround sound, not just playing the audio.
The TV will never have sound for the DVD as this system has no audio out puts. Realistically, most televisions have 10w speakers, and this system is 130w, so the TV speakers are useless in comparison.
I just bought an rca rtd3131 home theatre but only 2 of the speakers work with the dvd player.
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