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Dolby 5.1 (a.k.a. AC-3)
A multichannel digital sound coding process originally created by Dobly Laboratories, Inc. for theaters and later adapted for home use. It is the industry's benchmark sound format for DVD. Dolby 5.1 uses six channels of sound, one separate channel for each speaker: left, center, right, left surround, right surround, and low-frequency.
DTS (Digital Theatre System)
DTS is a six-channel digital sound format. In order to maintain full multichannel separation, it uses almost four times as much disc space as Dolby sound. Compared with the competing Dolby format, relatively few DVDs have been released with DTS sound. In order to take advantage of this DVD feature, a DTS decoder is required. DTS decoders can either be installed internally in your player or attached as an external module. Note: Some DVDs feature both the Dolby and DTS audio options.
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