Sorry I have had so many newbie questions, but here is another, and it is quite simple. I think.
If I have a soundbar with strictly one RCA input connection and assumming I am not dealing with a DVD player, MP3, or anything of the sort, do I run the two RCA cables from my digitial cable box to it or from my plasma to it?
Once again, just cable box-plasma-soundbar and nothing more
you could try feeding the soundbar with the red/white analog output from the TV. That way if you do hook a DVD player or game to the TV, the sound will be fed to the soundbar. Some TV's will pass through any input audio to the analog stereo output terminals.....but some will not, they will only pass the audio from the interal over-the-air tuner.
If, as you stated, you are only worried about the programming from a cable box, run the audio from the cable box to the sound bar