Today my father-in-law gave me a couple of gigantic old sony ss-u45 speakers. I was thinking about trying to hook it all up to my fta system, but I've never fiddled with ancient speakers like these before and am unsure what sort of a connector I need to get to make them work. The speakers have two screws in the back with a + and - ... what sort of a connecter do I need to get from radio shack or elsewhere that will let miniplugs or similar type of newer speaker wires convert over in to speakers like this?