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Just keep in mind in all this channel escalation to "27.1" or who knows what else - movies are mixed at a maximum of 5.1 'hard' channels.

What about DTS-ES 6.1 DISCRETE soundhound? When used, it IS a separate channel in the mix, and is not matrixed into the L/R surrounds. According to Digital Theater Systems, when Discrete is decoded by the surround processor, it will also subtact the matrix info out of the L/R surrounds allowing them to remain independent.