The QSC AD-C821 is a high-output, 8-inch ceiling-mount loudspeaker system from QSC's AcousticDesign Series, designed for installed applications requiring high output and pristine audio quality. It is a fully integrated, blind-mount system engineered for versatility and trouble-free operation in various environments, including high-ceiling applications. The loudspeaker features an 8" ferrite woofer and a 1.4" neodymium compression driver for superior full-range performance and 90° axisymmetric coverage. It is equipped with a custom low-distortion, multi-tap transformer that allows operation in 70V/100V distributed systems or in low-impedance mode.