JBL CSMA 280 Mixer Amplifier Utilizes Crowns DriveCoreTM technology providing excellent audio performance with high efficiency; Significantly reduced power consumption. Greater accuracy, reduced weight and best-in-class signal-to-noise performance Power efficiency and cost efficiency combine in a versatile, high-impedance system that allows one amp channel to drive multiple speakers without complex wiring and expands easily  just add to a speaker run. Euro-block type mic/line input and output connectors, and unbalanced RCA inputs for consumer connection; 8 inputs / 2 channels out. Supports 70V and 100V distributed audio systems without needing a separate transformer