High efficiency class D power unit with four independent 120 W channels in one mainframe. It occupies 2 units high in 19’’ standard Rack cabinet. Four electronically balanced 0 dB inputs abd four loudspeakers outputs for 100 V line. Signal inputs connection through removable strip. Rear selectors for input signals sharing/splitting. Protection against peaks, short-circuits, over-heating and over-loading. Front led indicators of power supply, signal, peak and protection. Cooling function by means of fan blowers. Power supply at 230 Vac. Frequency response 80 to 18,000 Hz, SNR> 85 dB and THD <0.1%. Dimensions 484 x 88 x 400 mm. Weight of 8.5 kg. Approximate consumption of 600 W. Finished in black. OPTIMUS model ref. DA-120D4.