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Dolby Digital Plus
Dolby Digital Plus is an extension to the Dolby Digital format, taking Dolby Digital's 5.1-channel surround sound format to 7.1-channel. The two additional channels are for surround back channels, which are placed directly behind the audience. This format is backwards compatible with Dolby Digital processors and uses the optical or coaxial digital outputs.
To take advantage of Dolby Digital Plus surround sound, you must have either:
(1) Dolby Digital decoder in the DVD player and a "Dolby Digital ready" AV receiver or pre-amplifier, or
(2) Dolby Digital AV receiver or pre-amplifier and use the DVD player's digital audio output (either optical or coaxial).
(This option is generally better since it allows the DVD player to pass the raw digital audio signal to the receiver or
pre-amplifier, which theoretically is less subject to interference and degradation.)
Also see: Dolby Digital, Surround Sound
Formats page for a full explanation,
Dolby Pro Logic IIz, THX
Surround EX, DTS Digital Surround
Additional Information and References: Dolby's Dolby Digital Plus home page
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