You can run some RCA terminated coax for as long as you want to enable using your desktop.

I have been using an external creative labs sound card with great success. The initial calibration check of the SC comes back dead flat compared to my PC on board SC which takes a nose dive at 70hz and lower.

http://www.soundblaster.com/products/product.asp?category=1&subcategory=208&product=17751

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70