JBL-STADIUM82SSIDescription A subwoofer that puts you in the drivers seat. JBL believes sound quality should never be compromised and the Stadium subwoofers make sure you dont have to compromise flexibility, either. Thats because these high performance subwoofers feature SSI (Selectable Smart Impedance), an exclusive impedance switch that lets you select the optimum impedance2 or 4 ohmsproviding multiple system configurations and flexibility. A special aero cooling