If you really want to try using them, look up what receiver they came with and search eBay for one, contact Sony for the connector.
OK, so I did a little poking around the Sony website and found those speakers likely came with a complete Home-Theater-In a Box set, probably a HT-SS370 or HT-SS370HD. The receiver with either was an STR-KS370, and it appears the receiver uses a proprietary connector at the receiver end of each speaker lead (wire.) Unless you have all of those speaker wires, getting that receiver would be a waste.