Spdif RCA/Coax cable arrived today. And it played music through my DAC.
System Spdif settings: RAW
Using Himedia Music Player it played MP3, 24/96 Flac, 24/192 Flac. It can't play DXD (32/352.8 Flac) and DSD64 (.dsf).
However through UAPP (USB Audio Player Pro) it played everything the app could support. But it used the ASL (Android Sound Layer) to do this. Thus converted everything to 16/48 regardless of bit depth or rate.
Did yours play??