I'll probably send the Fiio E10 back in the next few days, because the X-Fi HD seems to use my headphones better, but is not without some reservations. Whenever I've used one of the devices for a longer while, going to the other one always results in a refreshing sound experience. It's like they both use completely different approaches. The X-Fi uses the whole membrane-surface and to a significant degree the backgrounds resulting in a very earthy, relatively balanced sound, whereas the Fiio E10 uses only the middle membrane, but to a more powerful degree, resulting in great clarity in some midranges. I'm currently leaning towards the X-Fi because I'm less often reminded of its limitations, which seem to be always present with all the qualities of the E10. But if the E10 is any indicator of a better use of midranges, I'll be tempted to take the E17 although that was initially much too expensive for me.
50 Ohm of Sennheiser HD 595. Noise is probably the wrong term, I just tried to describe clarity and differentiation accuracy in a certain way. I've found it called "muddy" and that gives a better idea, though it is not all that bad.
Edited by Phelix - 12/2/12 at 11:29pm