CDi series amplifiers are professional tools designed and built for installed sound applications. Amplifiers are extremely versatile, rated for 2/4/8 Ohms loads and 70V and 140V outputs. Switch-mode universal power supply. Onboard DSP includes crossovers, EQ filters, delay and output limiting. Up to 20 user defined DSP presets are available. Accurate, uncolored sound with very low distortion for the best in music and voice reproduction. Intuitive front-panel LCD screen for quick, easy configuration. Advanced protection circuitry guards against, shorted outputs, open circuits, DC, mismatched loads, general overheating, high-frequency. overloads and internal faults. The series includes four models which are identical except for output power CDi 1000, CDi 2000, CDi 4000, and CDi 6000. All are rugged and lightweight.