Klein + HummelOperating Manual KPA Series English 7■ Installation and operationUnpackingCarefully open the shipping carton and check for any noticeable damage; thefigure 1 below shows the explodedview of the packing. Every Klein + Hummel amplifier is completely tested and inspected before leaving the factoryand should arrive in perfect condition. If you find any damage, notify the shipping company immediately. Be sureto save the carton and all packing materials for the carrier’s inspection.Mains cableManualAmplifierfigure 1MountingAll KPA amplifiers are previewed for the standard 19” rack mounting; there are four front panels holes and fourrear lateral holes. The amplifiers must be fixed into rack in both sides, back and frontal, to avoid mechanicaldamages. Your KPA amplifier uses a forced-air cooling system to maintain a low, even operating temperature.Drawn by an internal fan, air enters through the slots in the front panel and courses over and through components.The KPA series amplifiers feature an ”intelligent” variable-speed DC fan which is controlled by heat sinktemperature sensing circuits: the fan speed will increase only when the temperature of either heat sink requires it,which keeps fan noise to a minimum and helps cut dust accumulation inside. Under extreme thermal load, the fanwill force a very large volume of air through the heat sinks. If either heat sink gets too hot, its sensing circuit willreduce the output power. If the amplifier overheats, another sensing circuit shuts down its circuit to cut off poweruntil it cools to a safe temperature.
