Hi amirm,
thank you so much for your rigorous, consistent tests and for these excellent news about the RME ADI 2 DAC, especially for me as a relatively early owner of the RME ADI-2 Pro and as I ave been recommending it (als also its little brother when it came out) on head-fi. This coming just a few days after Virta Fortuna announced that the SP1000cu was tested to be the best DAP hje ever tested, even over the SP1000SS, again excellent news for me... (
https://www.head-fi.org/threads/dap-score-chart.874423/#post-14099475 ).
Re. the unusual issue of a single rate being displayed by Windows setting for RME DACs,
this issue used to bother me as well and it took me some time to find the solution in the manual:
to change the rate, look at the devices icons, they are normally on the bottom right of your screen, it often requires clicking on the double arrow pointing to the left,
then click on the icon with the black, red, yellow, and green horizontal stripes (probably representing a spectrogram): this opens the madiface user interface where you can change the rate.
Let me know whether this is helpful,
Have a nice Sunday,
bidn