| Re: I want my 7.1 (and a whole lot more...) :-)
Layering Dolby Pro Logic IIx on top of a DD or DTS stream will get you something very close to discrete 7.1. The original 5.1 channels stay unaltered, but the rear left is matrixed from the surround left and the rear right is matrixed form the surround right. It's not directly mirrored, rather, it uses phase ques and determines how much is similar and how much is different between the surround right and left to piece together the rears. It works extremely well, and I'd say it is the standard for 7.1 at the moment. In movies that don't put the surrounds to very good or very much use, it won't be anything special. In movies that do put the surrounds to good use, it definitely enhances the experience.
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