Hello. I'm looking at buying the Sennheiser hd558s, and people have suggested I buy a sound card for it. It was recommended I get a xonar dgx, but it doesn't have all the ports I'm looking for. My current setup is: Xbox (3.5mm jack) to line in on motherboard, routing to output with my windows sounds. Then I have a microphone to record with that doesn't route to my output. So, my question is: What's the cheapest, good soundcard for use with the hd558 that has an output 3.5mm jack, and a line in and microphone 3.5mm jacks?
If you want to get the best out of the Sennheiser headphones use an outboard digital to analog converter with headphone amplifier. This can connect with USB and bypass the soundcard completely. It will provide better power and quality of sound in almost any application. These range from $70 up.