Re: Home theater with ELX LCR...but what else?
No, AFAIK, the Anthems do not allow a single rear speaker (at least for ARC - it would probably throw an error when calibrating). I'm not sure what would happen if one hooked up a single rear speaker and then tried to play something with a profile configured for rear speakers or when watching/listening to something in surround. There is no way to set a single back.
I don't know about other manufacturers.
* LG OLED65E6P, BenqHT2050A
* Anthem AVM90, Rogue ST100, VTV Pascal 7 ch
* Sierra Towers/Horizon (all ELX RAAL), S2EXv2 surrounds, HTM200SEx4 heights, Rythmik E15HPx2
* VPI Classic 1+ (VTA & Fatboy Gimbal), PE Eagle/RR, VAS NOVA, Soundsmith Paua, Manley Chinook, Bob's Devices SUT, SugarCube 1 mini
* Oppo 203 & 103D, EverSolo DMP-A6
* miniDSP Flex, Audiosensibility & Blue Jeans cables, Symposium & Isoacoustics, GIK
* For RDJ: Anthem MRX720, Sierra LX, Luna Duo v2 center, CXNv2, TBD