JBL S2-1224SS 12" SSI 12" SSI Subwoofer Enclosure with Slipstream Port S21224SS | eBay
Amazon.com: JBL Club WS1000 - 10” shallow mount subwoofer w/SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm : Electronics
JBL S3-1224 Series III 12" SSI Subwoofer • FREE Shipping • Audio Jam Inc. of Delaware
1 Pair (QTY 2) of JBL STADIUM122SSI 12” High Performance 1350 Watts Peak Power Car Audio Subwoofers with SSI (Selectable Smart Impedance) - Road Entertainment
JBL STADIUM122SSI 12" High Performance Automotive Audio Subwoofer with Selectable Impedance - Creative Audio
Amazon.com: JBL Club WS1200 - 12” Shallow mount subwoofer w/SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm : Electronics
JBL S2-1224 SSI Car Subwoofer
Amazon.com: JBL S2-1224 - 12” Subwoofer with enclosure and SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm, Black (S2-1224SS) : Electronics
JBL S2-1224 SSI Car Subwoofer
JBL S3-1024 Series III 10" component subwoofer with impedance switching at Crutchfield