actually you can set up any of the auxillary items that you want, to a computer...it is dependent upon the sound card that you have installed.
This can be accomplished by either a stereo mini plug or RCA plugs or an Svideo plug.

You will need to have the auxillary equipment self powered and in some cases ran through a pre-amp but again....depending on the sound card...as some can receive straight through and filter themslves.

Check your computer for the sound in plug and go from there. Most installed sound cards today have 3 plugs:
sound in
Mic in
sound out

Newegg.com - M-AUDIO US41077 24-bit 96KHz PCI Interface Sound Card - Sound Cards

This is one of the better cards out there and highly recommended. It comes with a set of 6 rca dongles to connect up to 8 channels....

You would need to make sure it will install to your computer specs!