See here for comparison to S19 discrete resistor DAC. NOTE: PRE-PRODUCTION MEASUREMENTS. As expected, not great measurements. 0db 1kHz. Second, third, and forth order are about 10db less than the S19 measurements, but higher order are higher than S19. Note that spikes will be more evident and stand out more from the AverLAB measurements because the noise floor on the AverLAB is so much lower than from the QA400 with the diff probes. -60db 1kHz Lower 2nd order, but higher 3 order and a few spike higher than S19. -90db 1kHz Practically zero distortion except 10th and 20th order. Did Airist pay closer attention to precision matching / calibrating the LSBs???!!! Is this why the DAC sounds better that what the above measurements suggest? Or does the RDAC not like higher output levels?