CAR SUB / SP SERIES SP sub’s built with extremely high efficiency NEO motor. The motor utilizes N38SH Neo (heat treated). The entire motor would need to be nearly 250 degrees F before the magnet is affected in any way. SP15 | 15" 6000 Watt Max Power Car SubwooferSP18 | 18" 6000 Watt Max Power Car Subwoofer