JBL S2-1024SS Series II 10 Inch Subwoofer with SSi Selectable Impedance - 2 or 4 Ohm - Creative Audio
JBL Professional - JBL CONTROL SB-210 Dual 10" 400-Watt Indoor/Outdoor High Output Compact Subwoofer - Black - PSS Audiovisual Equipment
Amazon.com: JBL Stadium 1024 - 10” Subwoofer w/SSI™ (Selectable Smart Impedance) switch from 2 to 4 ohm : Electronics
JBL Club A600 High Performance Compact Class D Car Audio Mono Subwoofer Amplifier Bundle with JBL Club 1024 10" 1000 Watts Peak Power Selectable Impedance Car Audio Subwoofer and Amplifier Wiring Kit -
JBL - Two STAGE102 10" Car Audio Subwoofers - Creative Audio