Amazon.com: Pyle 10" Car Audio Speaker Subwoofer - 1000 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 4 Ohm, 50 oz Magnet, 2
STLF-1504-8 | 15" 450W Raw Subwoofer Replacement w/ 4" Voice Coil, 8-ohm – Sound Town
HIPPOXL152R - 15 inch Subwoofer | 3000 Watts RMS Dual 2 Ohm 4" V.C. Mega 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