JBL Stadium 102SSI Stadium Series 10" component subwoofer with switchable 2- or 4-ohm impedance at Crutchfield
Amazon.com: JBL SUBBP12AM - 450 Watts (150W RMS) 12” Amplified 12 in. Ported Subwoofer with Sub Level Control and Distortion Free Bass with Gravity Magnet Phone Holder Bundle : Electronics
JBL GX1200 High Performance 1000 Watts 12" 4 Ohm SVC Car Subwoofers SUB | eBay
Amazon.com: JBL S2-1224 SSI Car Subwoofer : Electronics
New JBL® Aftermarket Subwoofers Offer Deep Accurate Bass for Drivers | HARMAN
Amazon.com: JBL 12" Car Audio Subwoofer, Black : Electronics
JBL® Expands Aftermarket Subwoofer Line-up with Additional Audio Solutions for Every Vehicle | Business Wire
JBL CLUB1224AM Club Series 12 Inch Subwoofer with SSi Selectable Impedance - 2 or 4 Ohm - Creative Audio
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 Stadium 122SSI
Dual JBL Club 1024 Subwoofer in L-Ported Box BASS TEST - YouTube