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QSC KS212C dual 12-inch, active cardioid subwoofer
QSC KS212C Cardioid 3600W Powered Subwoofer with Soft Cover | PSSL ProSound and Stage Lighting
QSC Triple LA112 2,400W 12-inch Active Line Array Speaker and Dual KS212C Cardioid 3600W Dual 12 inch Powered Subwoofer Ground Stack System | Sweetwater
QSC K12.2 Active PA Speakers with KS212C Cardioid Subwoofer at Gear4music
QSC KS212C Powered PA Subwoofer CABLE KIT | KraftMusic.com