Which model do you have? Are you trying to use the Oppo as a transport to a standalone DAC? If so, it's my understanding that every Oppo has a optical out at else for CD audio. Are you talking about SACDs? I know that some Oppo players don’t output SACD audio to optical (licensing issues) and your only choice is to either use the built in DAC and output to RCA or you can output the audio to HDMI. With that said, why can't you just connect the RCA outputs directly to your pre-amp? The RCA outputs all the audio regardless of format. On a side note, I did heard some people having success buying a DAC that supports a HDMI input like the DACs made by Bryston.
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