+1, The Bricasti M3 DAC, including the MDx board, is outstanding, and I highly recommend it if you have the supporting high quality equipment and you want state of the art sound quality for its price.
"The MDx was implemented in production on all products starting January 2020, and is now available for upgrades. In keeping with our upgrade philosophy, all past D/A converter products are eligible for the MDx upgrade including all versions of the M1, M3, M12, and M21".
One reviewer said “The core of the Bricasti M3 DAC is actually two cores; a Delta-Sigma DAC for PCM processing and Bricasti’s own one-bit modulator for DSD. The digital and analogue sides of the M3 (no matter what configuration) are fed by two completely independent linear power supplies. The M3 is fed by a solid array of digital audio connectors and outputs to equally solid balanced and single-ended analogue connections”.