I have an Oppo 103 and only listen to 2 channel stereo. The first pair of outputs in the back, the ones on the far right when seen from the front of the player, are for 2 channel. If all else fails Oppo tech staff is very responsive to questions on their web site.

Cheers,

Geoff Kait
Machina Dynamica

Call their phone number and ask for tech support; they are very knowledgable and helpful.