Klein + Hummel
Operating Manual KPA Series
English
8
The exhaust cooling air is forced out through the rear of the chassis (
figure 2
), so make sure there is enough space
around the sides of the amplifier to allow the air to escape. If it is rack mounted, make sure the exhaust air can flow
without resistance. If you are using a rack with closed backs, there must be at least one standard rack space of
opening 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 2
Operating Precautions
Make sure the AC mains voltage is correct and is the same as that printed on the rear of the amplifier. Damage
caused by connecting the amplifier to improper AC voltage is not covered by the warranty. Make sure the power
switch 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 are
caused by faulty cables. Use good-quality connectors and wire, along with good soldering technique, to ensure
trouble free reliability.
AC Mains connections
The AC Main connection is made via the CPC type connector on the rear side of the panel. The
figure 3
below shows
the connection to the amplifier. Be sure that your AC mains power source has the requirements indicated in this
manual. 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 distortion
on the current. The system allows performance to be maintained even in circumstances of varying the mains
voltage.
It is important to connect the ground for safety, do not use adapters that disable the ground.
AC~ GND/ PE
AC~
figure 3
