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 428F Professional High-Power Dual 18" 1600W Passive 4281F
JBL Power P1020D 10" Dual 2-ohm Component Subwoofer at Crutchfield