JBL Stadium 122SSI 12" High-Performance Car Audio Subwoofer A subwoofer that puts you in the driver's seat: JBL believes sound quality should never be compromised and the Stadium subwoofers make sure you don't have to compromise flexibility, either. That's because these high-performance subwoofers feature SSI™ (Selectable Smart Impedance), an exclusive impedance switch that lets you select the optimum impedance-2 or 4 ohms-providing multiple system configurations and flexibility. A special aero-cooling design keeps the voice coil cool even at high output levels. This feature coupled with oversized voice coils increases power handling and ensures long term reliability. More power, more reliability, more flexibility-and no compromises. When you're ready to step up, Stadium is your subwoofer. Product Highlights: SSI (Selectable Smart Impedance): Stadium subwoofers feature a dual impedance switch that lets you choose either load impedance option. This allows for a variety of system configu