Dolby Digital Dolby Digital is the six channel input that allows for a more dynamic and realistic surround-sound experience. "5.1-channel" Dolby Digital has six descrete digital audio channels. It offers five full-bandwith channels that include the front left and right, the center, and seperate left and right in the rear. For the sixth channel there was added a "low frequency effects" subwoofer channel. Dolby Digital offers more movement throughout the channels in the front and rear that is accredited to the two seperate channels in the rear.