QSC PLD 4.5 2000 Watt Four Channel Power Amplifier Four channels of full function onboard loudspeaker DSP with crossover and parametric EQ filters 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 PowerLight universal switch mode power supply with PFC for highest efficiency, improved audio performance, and low weight Four input XLR connectors and six NL4 output connectors