if its a dual 2 ohm sub, you can wire it 1 or 4 ohms...
https://jlaudio.zendesk.com/hc/en-us/articles/204374200-Dual-Voice-Coil-DVC-Wiring-Tutorial
tons of good stuff to know...
https://jlaudio.zendesk.com/hc/en-us/categories/200265750-Car-Audio-Support