Klein + Hummel
Operating Manual KPA Series
English
7
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Installation and operation
Unpacking
Carefully open the shipping carton and check for any noticeable damage; the
figure 1
below shows the exploded
view of the packing. Every Klein + Hummel amplifier is completely tested and inspected before leaving the factory
and should arrive in perfect condition. If you find any damage, notify the shipping company immediately. Be sure
to save the carton and all packing materials for the carrier’s inspection.
Mains cable
Manual
Amplifier
figure 1
Mounting
All KPA amplifiers are previewed for the standard 19” rack mounting; there are four front panels holes and four
rear lateral holes. The amplifiers must be fixed into rack in both sides, back and frontal, to avoid mechanical
damages. 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 sink
temperature 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 fan
will force a very large volume of air through the heat sinks. If either heat sink gets too hot, its sensing circuit will
reduce the output power. If the amplifier overheats, another sensing circuit shuts down its circuit to cut off power
until it cools to a safe temperature.
