my older Jensen 375 watt subwoofer came from an friend but i dont know if its supposed to be wired at 2 ohms or 4 ohms. it says precision dual voice coil on the woofer itself and i didnt get any specs with it. it's like a 3 year old sub so what should it most likely be wired at? will i screw it up if i wire it at the wrong load?