Found some info in Chinese internet:
The new Cayin n6ii R202 engineering card has a loose and natural tone as a whole, and its solidity is between c201 and slightly e203. The most unique thing is that this card can switch between R2R and 1-bit DAC. The mid- and low-frequency under 1bit will be more solid than in R2R mode, showing more details and more resilient imaging, so the overall sound will be much more refined.
The R2R vocals will have more moisture, more low-frequency dispersion, and more advantages in emotional expression, which is especially suitable for lyrical songs. Of course, it also has an auto dac mode. In this Auto mode, the R-2R DAC will directly decode the PCM sound source, and the 1BitDAC will process the DSD sound source. Two styles, both are good to listen to, knock on the bowl