I've used Xion the last 2-3 years and I've been very happy with it until I bought my new computer.
I recently (um, 4 months ago..) bought a new computer, and the thing is, the sound is simply bad when using xion. There's no bass, no nothing. I've tried making my own EQ settings, tried with all presets, tried to activate and deactivate my soundcards EQ, and...well, everything. Other players such as WMP works fine, but I want xion x)
I use the integrated soundcard of the EVGA 780I SLi motherboard. (I'm getting a new card this evening so it's kind of stupid to ask you now, I agree

I don't really know what to say, and it's unnecessary to say too much if you have an easy solution.
If you want to know anything more I'll gladly support you with it.
Thanks
(just noticed that winamp sounds a bit weird as well)