Somebody should connect the V-DAC to a battery to see if it improves the sound quality. If you have an old 1.3mm DC power wallwart lying around, just cut the wires immediately before the wallwart and rewire directly to a car battery or motorcycle battery. The stock walwart is 12VDC and a battery will give you about 12.5V. The power going to the V-DAC will be cleaner so you'll have a lower and blacker noise level and the slight increase in voltage my improve the sound quality.
I can't believe with all the reviews in this thread that nobody has tried this DAC with a decent power supply. Musical Fidelity is planning on releasing one in the next few months, so surely there is a need for a decent power supply when using this DAC. The stock 500mA is completely impotent. Its the kind of power supply used for charging cell phones, a bit of a joke really. There is a long list of DAC's that have a significant improvement in sound quality from a change in power supply. Just read this thread on the improvements to the Kingrex UD-01 dac when the power supply was upgraded.
http://www.head-fi.org/forums/f46/re...01-psu-391485/
All the complaints about the lack of PRAT for the V-DAC is exactly describing the typical consequences of a week power supply. Too bad nobody is taking the initiative to find out what this DAC is really capable of. I guess all the V-DAC owners in this forum are content with mediocre sound.