kinghippoThey will take an RCA input, or a 3.5mm input. If you have a line out vs your standard "headphone" port on the sound card, use that to avoid double amping. Unless you prefer that sort of thing!
...I run my A2's through my Lyr's preouts via my Bifrost. Adds some very nice tubey goodness :) I am excited to hear the A5+'s, especially with the Auralex pads I bought for them. To be honest the DS1 stands transfer a noticeable amount of vibrations through my wooden desk when listening at fairly moderate-loud levels. I've heard good things about Auralex so I figured I'd just do it, not too much more expensive than the official stands anyway.
/ramble