The plug is a Cinch or Jones plug. Radio Shack had them (cat#274-001) or they are online. You need the two conductor version as they have them in 2,4,6,8,10 and so on. Then just solder two conductor (speaker) wire to each of the connectors and plug it in!
Here ya go $2.65 each: http://www.mcmelectronics.com/product/CINCH-P-302-CCT-/P-302-CCT
ET
Here ya go $2.65 each: http://www.mcmelectronics.com/product/CINCH-P-302-CCT-/P-302-CCT
ET