JBL 12" Inch 1000w Car Audio Subwoofer Driver Bass STAGE SPL Sub Woofer New 6925281927072 | eBay
JBL Club Series 12" 1100 Watts Selectable 2 or 4 Ohm Subwoofer CLUB 1224 - Walmart.com
JBL Stadium 122SSI Stadium Series 12" component subwoofer with switchable 2- or 4-ohm impedance 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 Grand Touring Series GTO1204D 12" subwoofer with dual 4-ohm voice coils at Crutchfield