DS18 EXL-XXB15.4D 4,000W Max Dual 4-ohm 15" Subwoofer
Amazon.com: DS18 SLC12S Car Subwoofer Audio Speaker - 12" in. Paper Glass Fiber Cone, Black Steel Basket, Single Voice Coil 4 Ohm Impedance, 500W MAX Power and Foam Surround for Vehicle Stereo
DS18 HOOL-X15.4DHE HOOLIGAN 15" High Excursion Car Subwoofer 4000 Watt – G2 Dynamics, LLC
DS18 HOOL-X15.1DSPL HOOLIGAN 15" SPL Car Subwoofer 4000 Watts RMS 4" 1 – Droppin HZ Car Audio