Nothing new about DD5.1 - it's the same system Dish uses for surround sound for programming that has it, generally comprising movie channels, major sporting events, certain news feeds, etc. (I expect some "network" programming is also in DD5.1 but I rarely watch any of it so I don't know.) DD+ accommodates 15 channels. Is it "backwards compatible" so that any content I D/L from Amazon that has DD5.1 audio will pass through to my receiver?
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