Car audio systems rely on powerful bass for great sound. System designers look for configuration flexibility. The Club Series 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. These subwoofers feature SSI™ (Selectable Smart Impedance), an exclusive impedance switch that lets you select the optimum impedance—2 or 4 ohms—for your system. So you get the powerful JBL bass you want, in the configuration you choose.