DAC section
It doesn't lose a bit of punch or anything when plugged in via USB. Also, I had it plugged in the wallwart and there was still nothing added hiss or hum wise. The DAC is actually pretty damn respectable. Although it's no match for a dedicated DAC, it does a GREAT job none the less, and I'm now debating bringing my Keces unit with me to Vegas for the simple fact it's another unit I need to carry for my 6 week trip...however, I probably will bring it anyways for the hotel room, lol.