QSC KSub Dual 12" 1000 Watt Active Subwoofer for K Series Speakers KSub Dual 12" 1000 Watt Active Subwoofer for K Series Speakers , Internal 1000 Watt Amplifier, Dual 12" Drivers, Lightweight and Portable, DEEP Signal Processing, DMT Directivity Matched Transition, Conical Wave Guide, XLR Inputs and Outputs, KSUB, Live Sound Speakers