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Dolby SR, the 2-channel analog format on the film, isn't 5.1. It's 4.0 with Left, Center, Right front channels and Mono surround.

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Dolby Surround aka ProLogic, was later enhanced with Prologic II which provided a higher bandwidth and rear left+right matrix.

Was that ever released for film use? I don't recall seeing any prints referring to ProLogic or ProLogic II during my time as a student film projectionist. If so, it was highly backwards compatible since our decoder was only SR (analog 4.0 matrix).

The prints would generally come with SR (analog 4.0) and SR-D (Bitmaps between the sprockets). Most of the time you'd also get DTS CDs and about 40-50% of the prints we got (in Stockholm) had SDDS, though I think there were maybe like 5 SDDS theatres in Sweden.

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