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This is the 5.1-channel sound system specified in the digital-HDTV standard. Also known as Dolby Digital, AC-3 delivers CD-quality digital audio and provides five full-bandwidth channels for front left, front right, center, surround left and surround right speakers, plus an LFE (low-frequency effect) subwoofer, for a total of 5.1 channels. See also Dolby Digital
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