Bose AM-500 Acoustimass Bass module hookup to new...

Question

The hookups for a sub woofer unit on the Sony Receiver are for RCA connectors. All other speaker connections are for the dual pair red and black speaker wires. My older model Bose AM-500 Acoustimass Bass module doesn't have any RCA connections so I don't know how to connect it and the bass sound is suffering on my surround system. Any ideas or tips would be greatly appreciated!!!