As per the title, can anyone recommend sound cards for the HD 598's?   I'm looking at the ASUS Xonar DG and DX cards, but I really don't want to spend too much, so I'm leaning toward the DG. Is the DG going to lack anything since it's PCI and not PCIe like the DX?

Hey guys. I just joined and am by no means an audiophile, but I have a few questions about my new HD 598s.   1. What type of headphones are they? They're not advertised as stereo or surround sound headphones anywhere on the box (from what I can see). They don't sound like stereo headphones...