If you only run 6.1 (as I do), you want to use the left surround back pre-amp output. In the SPEAKER CONFIG menu, there is an option between the SURR small/large and the SUB on/off that lets you set the surround back to either "LB/RB" (left back and right back), "BS(LB)" (back surround, left back only), or "NONE." You'll want to set that to "BS(LB)."

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