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.