Car audio systems rely on powerful bass for great sound. System designers look for configuration flexibility. Series II subwoofers deliver both. Designed to suit a range of applications, these 10- and 12-inch subwoofers produce signature JBL bass performance in sealed or vented enclosures. But the flexibility doesn’t end there. Series II subwoofers feature SSI™ (Selectable Smart Impedance), an exclusive impedance switch that lets you select the optimum impedance—2 or 4 ohms—for your system General Specifications Woofer: 12" (300mm) Impedance: 2 or 4 ohms, switch-selectable Cutout Diameter: 11-1/4" (285mm) Mounting Depth: 6-1/2" (165mm) Audio Specifications Sensitivity: 93 dB Power Handling (Peak): 1100 W Frequency Response: 25Hz – 175Hz Power Handling (RMS): 275 W