MohawkUS
1000+ Head-Fier
I got an answer back from Hifiman on this.Or rather other R2R dacs. It seems to have NOS mode but does it really? As far as I know, Denafrips Ares II is not truly NOS for example.
"NOS: The input sample rate for non-oversampling is whatever it is (for example, 96khz-24bit is input and 96KHz-24bit is input to DAC); Only Analog Filtering; The pulse response does not ring."