Originally Posted by Don Bingaman
Bob also states that an MQA topology for MCH surround processing has been under development, but that it requires two decodes - one before the DSP processing for room correction, etc, and one afterward, just prior to the D/A gateway back to analog. The second decoder presumably updates the complementary correction tables for changes the surround DSP's make in the digital data stream. This also makes sense to me, because if, for instance one chooses to use Trifield, a unique "rendering" file must be created for 3-6 data streams, vs. the two MQA encoded data streams that come into the box from the source.
I must admit I read this answer (A65) as referring specifically to the surround processing (including room correction) of a two-channel MQA input rather than a MCH MQA input.

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