Can I plug in my Polk Audio AMR1 speakers without the subwoofer?

I have a set of Polk Audio AMR1 computer speakers that originally came with a subwoofer which I no longer have. Is there a way to plug the speakers into my Dell Demsion 4400 computer without the subwoofer? The back of the small main small speaker says Left Speaker Output, Subwoofer Output and Input signal, and I have plugs for these. What I don't have is the plug that says 13.5 VDC which may have been where the subwoofer should go. Anyway to hook up them up directly into the computer without the subwoofer?