Vintage Pioneer subwoofer

Vintage Pioneer subwoofer. Condition is "Used". As I don’t know much about this. I’m not sure what what’s it is. Maybe someone will know. It was working fine last time. We haven’t been able to test it recently as I don’t have the wires to test. That’s why I’m saying the person who’s interested to buy they can test before they buy. You will need the amplifier to connect.