Perhaps it would have made more sense in retrospect to make the Prime a pure analog only headphone amp/desktop preamp and offered a DAC (with both SPDIF and USB inputs) in a matching case that could also be powered by the Prime power supply. I wonder how much the USB DAC added to the unit cost.

G68, G91, G98, DSP3100C, DSP3100 (x6), M80 (x3)