I have a rather unique situation here. I have obtained a racing simulator from the UK which is used for running racing simulation programs on a high end home computer. Problem is, it has a built in sound system using car stereo speakers from Pioneer (2 small tweeters, 2 6-inch, along with a special designed subwoofer) but no amplifier was provided. The builders of this setup seem to be unavailable atm... and I'm not sure what the minimum I would need for an amp... that can then be hooked up to my pc. What should I be looking for?