This photo shows the back of the Motorola, DCT6200/1000, (HD) high definition cable TV tuner. From left to right we see the right channel audio cable (red), the left channel audio cable (white), and the three component video cables (green, blue, red). The next cable is not needed. It is a digital audio cable that would go to a home audio system if there were one. In this case, the RCA audio cables (red and white cables shown in the picture) go to the audio input of the Toshiba display which has good sound quality.
