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Once the amplifiers are in place and turned off, connect the speaker
and interconnect cables. The preamplifier should be on at this point,
with level fully attenuated; all other sources should be off. Connect
the AC last.
OPERATION
When turning on the system, the amplifiers should always be last.
The KMA-160 on/off switch is actually a circuit breaker that is
involved in several protection circuits. Upon turn-on the amplifiers’
outputs are not connected to the speaker. After the protection
circuits have determined that the unit has completely stabilized, the
speaker relays will be engaged. You will hear a click when at this
point. The amplifiers are now ready to use. The amplifiers will be at
temperature and sound their best after approximately 15 minutes.
Operating the amplifiers is, obviously, very easy. Equally important
is an understanding of the care that should be exercised when
operating the system as a whole, in relation to the enormous power
output of the KMA-160. Simple mistakes, such as switching between
active sources without muting the preamplifier output, or
bumping/miscuing a cartridge, can generate large transients at low
frequencies. With this type of transient the KMA-160 can generate
enough power to damage most loudspeakers. All switching of sources
should be done with the preamplifier level either muted or fully
attenuated. Also, the inputs to the amplifiers should not be changed
while they are on.
Care must be taken when setting high playback levels. Because of
their tremendous reserve of clean power, KRELL amplifiers safely
drive speakers to higher sound pressure levels than other amplifiers.
This also means driving them to their limit. Always turn the level
down at the first sign of distortion.
When turning the system off, the amplifiers should be first. This
avoids the possibility of a turn-off transient from some other
component getting to the speakers.