Definitions for "THX Surround EX"
Keywords:  dolby, decodes, dts, theater, rear
Original name for Dolby Digital EX.
THX Surround EX provides direct decoding of Dolby Digital EX and Dolby Digital soundtracks. It can also be used in tandem with DTS-ES, DTS, Dolby Pro Logic, or Pro Logic II decoding. In either case, THX Surround EX applies unique processing enhancements such as Cinema ReEqualization(tm), Decorrelation(tm) and Timbre Matching(tm) to increase the realism and impact of the home theater experience. THX Surround EX decoding is capable of producing 6.1-channel sound from any home theater source. With Dolby Digital EX and DTS-ES DVDs, the 6.1 channels are implicit in the soundtracks themselves (in the case of Dolby Digital EX DVDs, the back surround channel is matrixed in the left and right surround channels). With 4-channel (Dolby Surround) and 5.1-channel (Dolby Digital and DTS) sources, the extra channel(s) are derived using special THX processing. You'll need a receiver with 6-channel power (or a 5.1-channel receiver with an auxiliary amplifier or a powered speaker) to enjoy THX Surround EX's back surround channel.
Dolby Digital created Surround EX for movie theaters. THX Surround EX is the home theater version and it decodes a back surround channel signal from the left and right surround channels to create a 360-degree sound environment. EX encoded DVDs are required.