So I got it all working correctly. The Denon AVr displays "Multi In" when DSOTM is playing. I also verified in the AVr's status that the signal it is receiving is PCM, 3/2/1. My main error was that my Oppo was not set to high resolution output. Once I set the oppo to output 1080i the multi ch signal was sent.
My settings are as follows:
Oppo: SACD priority - Multi-Channel Down-mix Mode - 5.1 Ch Digital Ouput - Raw HDMI Audio - Auto
The following is the Oppo manual's description of HDMI Auto, which suggest "Auto" is the best setting:
Auto – Digital audio output via HDMI will be the same as the digital coaxial/optical audio output for CD, Dolby Digital and DTS audio signals. For high resolution stereo or multichannel audio contents such as DVD-Audio and Super Audio CD, the DVD player will send multi-channel PCM audio signals with the highest available sample frequency and bit numbers. Depending on the original audio content, the format could be 44.1kHz - 192kHz, 2 - 6 channels. This option is recommended when connecting the HDMI output to an A/V receiver or processor with HDMI 1.1 or above audio capabilities.
Denon: Auto setting for audio. When you play a SACD, then MultiCh is displayed. When CDs are played, then Stereo is displayed. When a DVD with DD is played, then Dolby D is displayed.
Thanks for your help.
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