I ask this since I just got my BDP-93 today and don't have my 3D TV yet, but am curious. I've heard that some receivers will still pass the 3D signal to the TV even if they're not marked as 3D ready. I bought the Oppo as a safeguard against that since I don't want to have to replace my receiver- it has 2 HDMI ports to connect one to the TV and one to the receiver should the receiver not pass the 3D signal.
Anyways, I found that you can tell the player to 'force' 3D discs to play, bypassing the "3D capable TV and glasses required" stuff that comes up. My TV got no picture at all so I guess that's what happens if it can't display 3D, but my receiver also got no audio signal. The "DIALNORM" indicator lit up a couple times looking like it was trying, but no sound came through. Is this an indication that it won't work after I've added a 3D TV? Will the sound on 3D content work on it when a 3D TV is hooked up with the separate HDMI jack?
However on Directv 3D, they seem to still required the HDMI 1.4a 3D EDID from the AVR before they will send the 3D signal and your older AVR cannot send this on it's own. It may be possible, if your AVR has a full HDMI pass-thu, for your TV's EDID to reach the sat receiver but not promised.
If you connect the audio and video separately using the OPPO player's two HDMI outputs, you'll be fine. One goes directly to the TV for video. The other goes directly to the receiver for audio. This will work for both 2D and 3D content.
Your receiver will not process the audio if you try to connect just one output to the receiver and expect the receiver to pass the video to your TV. That may work for 2D content, but you'll get nothing (neither audio nor video) with 3D content.
The OPPO player has two HDMI outputs specifically for this situation. Use them.