Quote:
Originally Posted by HeadLover 
amm yep the fact that it is 5V by the USB is nice, BUT (and that is a big but), sometimes the USB (most of the time) power isn't very clean and can really bring bad SQ.
(Not saying this is the case here, but really PC power isnt great at all)
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I haven't heard any bad effect from the USB power with the prototype and correct me if I'm wrong but the Pico amp/DAC uses USB power for the DAC and the Li-ion battery only powers the amp section.
I do agree with the noisy PC environment. I use a HP laptop and I needed to lift the ground with a cheater plug to eliminate noise with my Pico(just a ground issue?) and I'll guess this would happen with my only other current USB DAC, the XM5, although I've never tested.