It sounds better than the X7 with the K5, but obviously not as good as the X7 attached to the Valhalla. For a mobile setup, it's pretty good. I usually have the volume around 55 with high gain for AM3 balanced with HD 650. On another note, I've been testing out the DAC function with the 3.0.10 beta FW. I haven't heard any skipping or experienced any restarts/shut downs. I think we might be closing in on a stable release! Hype! Also, the graphic for DAC mode looks cool.