Like above, use an optical connection (need fiber optic cable) or a coaxial connection (single RCA cable). HDMI might also work, but I personally haven't checked. Connect the audio outs from the cable box to the audio ins on the home theater. The TV will only need a video connection from the cable box, as well as one from the home theater (for DVDs, onscreen menus).
This discussion can help you set up the universal remote.
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