What configuration are you shooting for? 2 speakers for L and 2 for R? Or two seperate zones? Or 4 discrete channel L, R, LR, RR? Lots of serial and parallel configurations are possible within the stero constraint XeononMan points out.
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975/7075/SMS-1
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-203, XBOX360, Xbox One
LG 65" OLED
RR2150 w/Klipsch SCR-2