Gonk and Xenonman:

Thanks for the help, I used the left speaker and it seems to be working albeit I have no idea whether it is receiving a blend of the rear feeds or just the left rear. I should probably call Outlaw in the morning to confirm. I don't think a 7th speaker will ever pass the WAF test.
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Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra