The NAD M51 DAC uses the same digital engine as the NAD M2 (4600 euro) stereo digital amplifier.
It´s an asynchronous DAC, with an 8 channel chip split into 2×4, which gives very little noise and low jitter. The signal goes through a 35-bit/844 kHz sampling rate process to reclock the PCM signal to PWM, which should gives better and more undigital sound quality.
Input up to 24-bit/ 192 kHz trough S/PDIF optical, coax, USB, 2x HDMI and AES/EBU.
The HDMI input will have video pass trough, so plug in your Blu-Ray player directly and get a high rate stereo movie soundtrack.
Output is balanced XLR, HDMI video out, USB and RCA.
The M51 can also be used as a preamp