... connected by speciall four-core line ModelPA1202PA1502Rated Output Power Continuous Average Power RMS,1KHz,THD≤1%4CH@ 4ΩLOW( ... ,output over current protection,mains fuses protection,turn-on/off muting,RF protectionDynamic LimiterIntelligentCoolingFour Variable-speed DC ... ,front-to-rear air flowLED Indicators Front panelPower-ON,Mode,Clip/Limit,Signal,ProtectionLED Indicators Rear panelNoInput ...