EN4Rack MountingOptional handles shown. Use four screws and washers to mountthe amplifier to the equipment rack rails. To use theamplifier outside a rack, attach the self-adhesiverubber feet to the bottom.CoolingAir flows from the rack, into the back of the amplifier,and out the front. This keeps the rack cool. The fanautomatically runs faster when the amp is workinghard.Do not block the front or rear air vents!AC Mains ConnectionConnect AC power to the IEC socket on the back of the amplifier. NOTE: Turn off the AC power switch before connecting AC power. TheAC Switch must be turned on to use remote control systems or the Standby function.The correct AC line voltage is shown on the serial number label, on the rear panel. Connecting to the wrong line volt-age may damage the amplifier or increase the risk of electric shock.Air flow in QSC amplifiers: Cool air is drawninto the rear of the amplifier by the cooling fan.Warm air exits the front of the amplifier.1- CH1 Terminal Block Input Connectors2- DataPort Connector3- CH2 Terminal Block Input Connectors4- Mode Switches5- Barrier Strip Output Connectors6- Cooling Air Inlet Vents7- Mode Switch Setting Diagrams8- IEC Power ConnectorRear Panel(CX404 shown, other models similar, 2-Ch. models equipped with XLR inputs as well)