Optical and digital cables carry digital signals from CD, DVD, and Blu-Ray players, media servers, cable boxes, etc. These digital signals are sent to your AV receiver, D-to-A converter, preamp-processor, etc. and decoded to provide you with quality multi-channel or stereo music and video sources, depending upon the specific devices you are using.
Having a good digital cable is absolutely essential to having great sound. A lousy or inappropriate cable can result in sonic disaster.
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