HOW DO U KNOW WEN A ORION HCCA IS A 2 OHM OR 4 OHM SUB?

[fishies19]

I BOUGHT A 12 INCH ORION OF A FRIEND..BUT I WANT TO KNOW IS ITS 2 OHMS OR 4 OHMS...HOW CAN I CHECK PLZ LET ME KNOW THANXS.....