This is a fascinating discussion @wizardofoz . However, the presumption that DSJ’s Bridge II input only supports DSD64 flies in the face of the specs published by PS Audio.
I’ve inserted a screen shot below, to document that it does say that. Take a look at “DSD rate”. But since it appears that the DSJ is reporting to Roon that DSD128 has to be down sampled, there is a disconnect between what PS Audio claims, and how the DSJ works with Roon.
Please do let me know if I’m missing something here, as I’d like to take this up with PS Audio. Hopefully the solution will be what The DSJ reports in RAAT vs. them modifying their published specs. 