If you wanted to get subs to add to your computer, would you have to get them through the company you got your computer from? Or could you just go to WallyWorld or Best Buy and get some?
If you want more bass, you are better off buying a new computer speaker set for your computer that includes a seperate woofer. You can pick up a good set for less than 50 bucks from walmart, eventho the better sets will be a little bit more expensive.

edit: before I forget, depending on your stereo, you might be able to run the sound output of your PC right to your new system, so all you would have to do is buy some wire, and you know what you are getting for sound quality.
I wondered about the stereo thing'd be nice if I could get 2-4 more in every corner. :lol: