Amazon.com: JBL S2-1224 - 12” Subwoofer with enclosure and SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm, Black (S2-1224SS) : Electronics
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 S2-1224 SSI Car Subwoofer : Amazon.com.au
S2-1224 | 12" car audio subwoofers
Amazon.com: JBL - Two CLUB1224AM Club Series 12" Subwoofers with SSI Selectable Impedance - 2 or 4 Ohm : Electronics
Amazon.com: JBL S2-1224 - 12” Subwoofer with enclosure and SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm, Black (S2-1224SS) : Electronics
S2-1024 | 10" car audio subwoofers
Amazon.com: JBL Club 1224 - 12” Subwoofer w/SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm, Black : Electronics
JBL S2-1024SS 1000 Watts Peak 10" SSI Subwoofer Enclosure with Slipstream Port 50036326759 | eBay
Subwoofer JBL Club 1024
Amazon.com: JBL - Mobile Stadium Marine Series 10" Premium Free Air Subwoofer w/SSI RGB Lighting White (STADIUMMW1000AM) : Electronics