Amazon.com: JBL Club 1024 - 10” Subwoofer w/SSI (Selectable Smart Impedance) switch from 2 to 4 ohm, Black : Electronics
Amazon.com: Infinity REFERENCE-1270 Reference 12 Inch Subwoofer with SSI (Selectable Smart Impedance) : Electronics
BIETE Subwoofer und Rearfill für Smart 450 : Biete Smart
Smart Subwoofer fortwo 1 aktiv XCar-Style
Amazon.com: JBL Club WS1200 - 12” Shallow mount subwoofer w/SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm : Electronics
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
Smart 453 JBL Sound System Subwoofer Speaker Genuine SMART A4538201200