An enhancement to Dolby Pro-Logic II, that includes the addition of two back channels, in addition to Dolby Pro-logic II's 5.1 channels, thus making Dolby Pro-logic IIx a 7.1 channel surround decoding system.
For addtitional information on surround sound and its relation to home theater, check out my reference article: History and Basics of Surround Sound.
For additional terms and definitions, check out my Home Theater Glossary
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