I have a pair of Logitech speakers that came with the Logitech X-530 surround system. I'm not using the 2 back speakers for surround and wish to use them with another computer. I was wondering the cheapest way I could go about doing this? I believe that I would need to power the speakers in some way, and wonder if I need a woofer to do this? I don't mind not having a woofer. a solution would be greatly appreciated!