Someone told me I can use 3 RCA (1 video + 2 audio) cables as component video cables. Is this true? I tried and the picture quality of component (progressive scan DVD) looks identical to a picture when playing the same DVD via a single composite cable. I did back-to-back setups and stared at the pictures. I do see small faint interlace lines too. A progressive picture has absolutely no lines right? Should I buy component cables or do 3 RCA cables work just the same ? Specs: Sony 57" widescreen HDTV and Sony DVP NS715P DVD player w/ progressive scan.