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So the cable is already run? Let's work this out: Problem: 3 conductor cable could be 3 video cables, or a L/R/Video cable with the L/R cables not being 75 ohms. How do we tell? Do this: get a good test-pattern up with lots of straight lines & contrasting colors. Make a little chart...

Hi Mike. Welcome to HTF! :) As James pointed out, Red & White cables are for audio and audio cables can be made with any of the popular impedences of coax: 50, 75, 110, 300. Note: all video cables are made with 75 ohm coax. (Component cables are just 3 composite cables in a bundle). But...