BOSS Audio Systems P156DVC Phantom Series 15 Inch Car Audio Subwoofer – 2500 Watts Max, Dual 4 Ohm Voice Coil, Sold Individually, For Truck Boxes and Enclosures, Hook Up To Amplifier
15" Competition grade Hand Built Subwoofer 8000rms (Super Team) - EM Audio Subwoofers
DS18 EXL-XX15.2DHE 4,000W Max Dual 2-ohm 15" Subwoofer