Dolby Digital Surround EX

Dolby Digital Surround EX is an extension of Dolby Digital introduced on October 20th, 1998 jointly developed by Dolby Laboratories and THX that allows for matrixing the rear audio channel into two (or more, theatrical only) or more rear speakers. While it is not the same thing as a true sixth discrete track, it gives off the effect of one. It would later be extended by Dolby Surround 7.1 in 2010.

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