Amazon.com: JBL 12" Car Audio Subwoofer : Electronics
JBL GX Series 12" Single-Voice-Coil 4-Ohm Subwoofer Black GX1200 - Best Buy
JBL STADIUM122SSI 12” High Performance 1350 Watts Peak Power Selectable Impedance Car Audio Subwoofer Bundle Combo with Class D 1500 Watts Peak Power Car Audio Mono Amplifier and Amp Wiring Kit - Road Entertainment
JBL GT-BassPro12 Ported powered subwoofer with 12" sub and 150-watt amp at Crutchfield
JBL GT-BASSPRO12 - Superior 12 Inch Ported Powered Car Subwoofer - Amplified sub boxes - Online Car Audio & Stereo Store