Part Number is RMP101AG-T45
MTX ThunderForm RMP101AG-T45 Gray Ranger/B-Series Amp/Sub/Box
This MTX Audio ThunderForm is LOADED and AMPLIFIED.Amplified ThunderForm models feature a proprietary woofer design thatincludes a long excursion voice coil, and presents a very low ohm load to theamplifier. This design takes full advantage of the efficiency of Class Damplifier design while delivering powerful, low frequency extension. Add all ofthese features up, along with over voltage, over current, and voice coil shortprotection, and you have a unit that looks and operates like it came as anoriginal part of the vehicle.