QSC AD-C820R SYSTEM 
Features
8-inch low-frequency woofer
1.4-inch diaphragm compression driver
200 watt continuous power rating
70V/100V multi-tap transformer included (system can operate in distributed or low-impedance mode)
AD-C820 transducer/baffle assembly for separated backcan installation
AD-C820 is sold in the following system packages:
AD-C820R SYSTEM AD-C820 speaker baffle
AD-C800BB Backcan assembly
AD-C800RG Round gril