The QSC AD-C6T 6.5" 2-Way Ceiling Speaker is a passive loudspeaker designed for sound reinforcement applications in commercial environments. It's part of the QSC AcousticDesign Series, offering consistent audio quality across different installation types (ceiling, surface, and pendant mount). The "T" in the model name indicates it includes a multi-tap transformer for use in 70V or 100V constant voltage systems, which is typical for commercial background music and paging applications.