Originally Posted by tkamiya

That's strange....

Composit video signals are INFERRIOR to S-Video signals. By definition, composit signals overlay vertical and horizontal sync with the video signal in one wire. Some may even have audio. From your description, it seems, you have Composit Video, R sound and L sound. S-Video signal keep them separate. The bandwidth of composit signals are much lower than S-Video as well.

At standard resolution of TV, you will probablly not notice any difference, provided both cables and connectors are in good quality and shape. At higher resolution, you will start to see mixing of color and less stability with composit.

A true composit video signal does not require RG-6 which is an RF grade coax with stiff center conductor, and is designed for short run of cable-TV range of frequencies. Composit VIDEO signal is 6Mhz in frequency. Any good quality RCA connector with shielded cable will do just fine.

Long story short, if you see an improvement by going from S-Video to Composit, there's something wrong...