Klein + HummelOperating Manual KPA Series English 8The exhaust cooling air is forced out through the rear of the chassis (figure 2), so make sure there is enough spacearound the sides of the amplifier to allow the air to escape. If it is rack mounted, make sure the exhaust air can flowwithout resistance. If you are using a rack with closed backs, there must be at least one standard rack space ofopening in the front of the rack for every four amplifiers. Amplifiers may be stacked directly on top of each other(no space needed between units), starting from the bottom of the rack.figure 2Operating PrecautionsMake sure the AC mains voltage is correct and is the same as that printed on the rear of the amplifier. Damagecaused by connecting the amplifier to improper AC voltage is not covered by the warranty. Make sure the powerswitch is off before making any input or output connections.Whether you buy them or make them, use good-quality input and speaker cables. Most intermittent problems arecaused by faulty cables. Use good-quality connectors and wire, along with good soldering technique, to ensuretrouble free reliability.AC Mains connectionsThe AC Main connection is made via the CPC type connector on the rear side of the panel. Thefigure 3 below showsthe connection to the amplifier. Be sure that your AC mains power source has the requirements indicated in thismanual. The KPA amplifier has an automatic power factor correction system for a perfect mains network interface.The amplifier is a resistive load for the mains network, minimizing the reactive power and the harmonic distortionon the current. The system allows performance to be maintained even in circumstances of varying the mainsvoltage.It is important to connect the ground for safety, do not use adapters that disable the ground.AC~ GND/ PEAC~figure 3
