JBL SR4718X Single 18" 1600W Program 3200W Peak Passive Subwoofer Un-Powered Sub | eBay
JBL CS1214 1000-watt, 12" Car Audio Subwoofer, Black - Walmart.com
Amazon.com: Pyle 12' Car Audio Speaker Subwoofer - 1600 Watt High Power Bass Surround Sound Stereo Subwoofer Speaker System - Non Press Paper Cone, 90 dB, 40 Ohm, 60 oz Magnet, 2