Its a dual voice coil woofer. Can either be used in parallel or series, depends on what ohm load you want.
Parallel both positive tied together, both negative tied together. 2 ohm load
Series one positive from one coil jumped to the negative on the other coil. Then you hook your leads to the empty terminals. 8 ohm load
What does a dual coil sub mean?
Subwoofers have a single voice coil or dual voice coil. (DVC) subwoofers use two separate voice coils, each with its own connections, mounted on one cylinder, connected to a common cone.