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>>>Bot DD and DTS have 6.1 and 7.1 versions as well.<<<

The Dolby Digital format is only capable of 5.1 discrete channels. Dolby's newest digital format, Dolby Digital EX 5.1, uses matrix technology to encode a seventh channel. It is not a discrete channel.

The DTS format is capable of 6.1 discrete channels in its current form (it has provisions to encode another discrete channel). The name of that DTS format is DTS ES 6.1 (Discrete)*. There is also a matrix version of DTS, called DTS ES 5.1 (Matrix)*, which encodes the extra channel using matrix technology similar to Dolby's EX solution.

Dolby has already stated that they do not want manufacturers or software companies referring to the EX format as 6.1, because the extra channel is not discrete. However, as a surround "decoding" format, Dolby's new Pro-Logic IIx will give you 7.1 "non-discrete" channels from a 2-channel mix and can add two new "non-discrete" channels to a digital 5.1 mix.

* Technically not necessary by definition, sometimes the words "Discrete" and "Matrix" are added to the format's name.


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