Don't know, but based on the specs I would say the 975 would be better. Plus, if I remember right, if you use stereo with a subwoofer the input just gets digitized anyways..
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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