Your correct, but technolgies like Dolby PLIIx will take 2-channel and 5.1 movies and make use of the rear speakers for a full 7.1 experience.

Every movie I watch is done in either "DD + PLIIx" or "DTS + PLIIx" modes, most receivers will achiever this if it has PLIIx.

By the way, I LOVE my Emotiva MPS-1 amp.

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