Amazon.com: JBL Club WS1000 10" Shallow Mount subwoofer w/SSI (Selectable Smart Impedance) Switch from 2 to 4 ohm Bundled with Alphasonik Earbuds : Electronics
JBL GX Series 12" Single-Voice-Coil 4-Ohm Subwoofer Black GX1200 - Best Buy
Amazon.com: JBL Stage810 - 8" Car Audio Subwoofer, Black (STAGE810AM) : Electronics
Car Subwoofers | JBL
JBL CS1214 1000-watt, 12" Car Audio Subwoofer, Black - Walmart.com