... PA, P series Bi-amp and DP series processors... Pro Amplifier: PA seriers 4CH audio power amplifiers combine all matched ... of heat-sinks and transformer,output short protection,output DC protection,output over current protection,mains fuses protection,turn ... -on/off muting,RF protectionDynamic LimiterIntelligentCoolingFour Variable-speed DC fans,front-to-rear air flowLED Indicators Front panelPower ...