Sorry to ask this SACD question, but

SACDs are meant to be decoded internally by the player, just use the analog outs on the player over to your preamp and good to go.

According to the OP they cannot get any sound over the analog outputs, which is most peculiar.

Maybe my OPPO menu settings will help.

"How's everyone else playing SACDs?"

Maybe by bypassing the player altogether. Rip the files into DSD and play through any DAC you wish (as long as it works with DSD).

"According to the OP they cannot get any sound over the analog outputs, which is most peculiar."

I am not sure about Oppo, but some machines disengage internal DAC when something is connected to a digital output.

In this case, I would disconnect HDMI (or whatever digital connection is there) from the player when attempting to listen to a SACD via RCA/balanced outputs. I would not even just turn those off but rather pull them out from the player for a test. Just a thought.

Best way to hear DSD is via ripped or purchased files playing via a streamer or computer through a stereo or multichannel DAC you can use for example an early PS3 or Oppo 105  to rip. Or buy from native DSD online etc.

Most importantly the best sound is achieved playing it as DSD not PCM so outputting 24/176 is not ideal.

Oppo can play SACDs via its internal DACS and output via RCAs and sounds pretty good. Oppos can also output DSD over HDMI but this is pointless as the AV amp you connect to will downconvert to PCM and most do this at 16/44

SACD uses copy protection to prevent the data being sent via a digital cable as others have said. Early examples of digital connection were proprietary to Sony (SCD XA9000es) and DCS using FireWire cables. HDMI can be used to send it as it has the High Definition Copyright Protection standard. 

However it was possible with early PS3 see thread here and that may be your cheapest option.
https://forums.stevehoffman.tv/threads/using-ps3-as-an-sacd-player-voice-cancellation-issue.214006/