Voices (center channel) mysteriously disappeared from all surround
signals on this receiver. No hints on the Onkyo website, the manual,
or the internet in general, so I thought I'd save others the grief and
post the solution. The problem is a result of having activated
"Speaker B" at the receiver. Assuming you have everything else setup
properly, only "Speaker A" should be activated. If you depress
"Speaker B", you lose the center channel and the two surround speakers.
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