JBL Power P1220D 12" Dual 2-ohm Component Subwoofer at Crutchfield
Amazon.com: JBL Club WS1200 12" Shallow Mount subwoofer w/SSI (Selectable Smart Impedance) Switch from 2 to 4 ohm Bundled with Alphasonik Earbuds : Electronics
JBL IRX115S 1300 Watt 15" Powered Subwoofer Pro Audio PA Sub+(4) Wireless Mics - 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
4)JBL 6.5" Coax Car upgrade Speakers & 4 Channel Class D 1600 Watt Amplifier | eBay