Multi-channel processing amplifier. Flexible Amplifier Summing Technology (FAST) drives most any loudspeaker system or configuration by distributing total amplifier power across one, two, three or all four channels. Full function onboard loudspeaker processing DSP with crossover and parametric EQ Filters, limiting and alignment delay eliminate the need for outboard loudspeaker processors. PowerLight universal switch-mode power supply with PFC for highest efficiency, improved audio performance, and low heat dissipation. Powerful Intrinsic Correction processing maximizes the sonic performance of QSC loudspeakers. 20 factory preset configurations that can be modified and stored in the 50 user presets. Integrated front panel with channel select and mute buttons, input and output LED metering, 400 x 240 LCD, intuitive navigation buttons, LED power button and indicator, and cast aluminum handles. GPIO for additional functionality including a heartbeat output for life-safety supervision. Four Input XLR connectors and six NL4 output connectors. Frequency response: 20 Hz - 20 kHz. Output power: 4 x 1250 W - 4 ohm. AC power input: Universal Power Supply 100 - 240 VAC, 50 - 60 Hz. Dimensions: 89 x 482 x 406 mm. Weight: 9,5 kg.