I currently own a pair of 668Bs which I use through a Creative Sound Blaster X-fi HD (USB one, though using it on a desktop). And boy are they hissy on highs. And I believe that the Sound Blaster might be part of the problem. The highs can really be annoying, and cymbal sounds for example come forward too much. I tried fixing that with EQ but that kind of messes with other sounds, and I can only EQ on my player (Foobar 2k) because the SB drivers don't come with an EQ. Meaning the highs continue to kill my ears through sounds not coming out of Foobar. I also heard about burn-in but some say it does nothing. Because of this, I came here to get advice on a good but not too expensive soundcard to pair up with the 668Bs which will fit their sound and impedance (heard too much impedance can be bad for the 668B's 56 ohms). EAX or some sort of emulation of it is required as I play quite a few games. Yeah, I'm not too good with all that stuff, but I really want some decent sound and I don't have much money to throw around.