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Oppo 203 SPDIF Digital Coax output

Question: Does the SPDIF digital coax audio output of the Oppo 203 send the input (HDMI) audio signal unaltered when bitstream is selected? If it's possible, what are the settings to use? My use case is 2-channel streaming music from an NVidia Shield Pro 2017 using the HDMI input of the Oppo, with the SPDIF digital out feeding an external DAC. I've tried various settings, and the telltale sign of alteration is when I change the speaker config (e.g., distance of front left speaker), it changes the sound on the digital coax out! Direct A/B comparison between the USB (both Stereo and high resolution stereo) out of the NVidia Shield and the SPDIF digital out also sound markedly different. Maybe it's some setting with the Shield, maybe it's some setting with the Oppo.

Somewhat related question: is there a difference in USB sound between the Shield 2017 vs. 2019?
jitenn
mahler123
3,260 posts
 
On the off chance the OP is sending DSD files from the streamer to the Opposite over HDMI, the Opportunity won't output DSD over coax into a DAC, but will output them over HDMI
jdub39
491 posts
 
I plan on trying my 2019 Shield pro via usb soon to a dac I just picked up but as it stands for now I use my oppo 203 via coax set to LPCM to take advantage of high res files up to 24/192hz, will it send that via bitstream as well? that may be the difference as I also have my Oppo running hdmi to my Marantz 8805 and switching between the two sound different enough to tell apart with the dac using it's balanced outs to the 8805.
jitenn OP
8 posts
 
Thanks folks. Working with Oppo tech support. Something is awry, but a full power cycle seems to have changed something as well.
rego
378 posts
 
Please follow through with an update ...
rego
378 posts
 
@jdub39, to address the idea of 'streamer' (which to use), both players are very good and both are centered in a AV use capacity as opposed to
UHD Audio.
Streaming development is fluid and evolving.
Shield development has shown less emphasis on Audio Playback which may change.
Oppo dropped the UDP line ... !

Shield with a Linear PS could be good performer (not that it is not already) ... and then with an OS upgrade could be better ...
 
UDP-203 User Manual pg. 57 - S/PDIF Output / Bitstream shows:

" Bitstream (default) – Passes audio as compressed bit-stream format to the receiver/amplifier. Choose this setting if your receiver/amplifier is capable of decoding Dolby Digital and/or DTS.".  

Showing 'compressed bit-stream format'.
 

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