The small speaker settings should be set but only in the 950, not the Oppo. This engages the bass management in the 950 based on the xover settings also in the 950. The point being to have the Oppo pass the full signal via large speaker setting and then let the 950 do the bass management via small speaker setting. I hope this helps.
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Marantz AV7702mkII, Outlaw 7220, ,7ea-Outlaw LCR (2ea.- L/2ea.- R/C/SR/SL),Outlaw 7125 for 4ea-Outlaw LCRv2 (Atmos ceiling),Outlaw Ultra-X12 & LFM-1EX Subwoofers,BR/DVD Oppo BDP-103,BDP-83SE, Samsung 65" OLCD, Sofabato remote - Whole house audio via two (2ea) 7125s.