I’m taking the digital signal out of the X800-MkII, running it to the DAC via coax cable, not using the HDMI, it a old school stereo (2 channel), absolutely no AV or computers
Your use case here is the coax out from the x800m2 to the coax in of an external DAC. I just tried this on my set up using a hybrid SACD which has a 2ch CD layer, a 2ch SACD layer, and multi-ch SACD layer. DSD is the format for SACD. PCM is the format for CD. Here are two scenarios on the x800m2:
#1
Audio Setting --> Digital Audio Output set to "Auto"
Music Setting --> SACD Playback Layer set to "SACD"
Music Setting --> SACD Playback Channel set to 2ch
With these settings on HDMI I get DSD 2.8 Mhz to AVR. On Coax out there is no signal to the DAC. This is consistent with what I have read which is that one cannot send a DSD signal over coax (maybe in a PCM wrapper but native DSD no)
#2
Audio Setting --> Digital Audio Output set to "PCM"
Music Setting --> SACD Playback Layer set to "SACD"
Music Setting --> SACD Playback Channel set to 2ch
With these settings x800m2 transcodes the DSD to PCM. On HDMI I get PCM at 176.4 khz. On Coax out to the DAC I get PCM at 44.1 khz.
So with Coax out I can only listen to the SACD layer with DSD to PCM transcoding at 44.1khz whereas others have suggested 88.2khz or 176.4khz might better take advantage of the hi-res aspect of SACD. Fortunately however, at least you can still enjoy listening to your 200+ SACD collection with the x800m2, including those without a CD layer. As far as I know DSD not going over coax is the general situation as suggested in another post above, ie not specific to the x800m2, so would likely be the result of other SACD players with coax out. If you really really want to get that DSD you can add an AVR with DSD capability on HDMI (not all of them do it) or obtain a different SACD capable disc player which has analog out.