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Q I have my Pioneer Elite SC-LX901 AV receiver connected to a 7.1 speaker system. When I press the SURR button on the remote, the receiver’s front-panel display shows all 7.1 speakers lit up and ready for action, but no sound comes out of the two Surround Back speakers. Do you have to watch a disc with a 7.1-channel soundtrack to get 7.1-channel sound, or can my receiver upscale a 5.1 soundtrack to a 7.1 format? The SC-LX901 is a Dolby Atmos-capable receiver, so I’d expect it to upscale 5.1 soundtracks for 7.1 output.—B. Hinson
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