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Amplifier Operation
It is easy to understand the operation of the
KAV-250a amplifier. However, great care
needs to be exercised when operating a sys-
tem that includes the KAV-250a, because of
the amplifier’s enormous power output.
Switching between active sources without
muting the preamplifier output, or bump-
ing/miscuing a cartridge, can generate large
transients at low frequencies. The KAV-250a
amplifier may generate enough power with
these transients to damage most loudspeak-
ers. All switching of sources should be done
with the preamplifier level either muted or fully
attenuated. Do not change inputs to the ampli-
fier while the amplifier is On.
NOTE: Care must be taken when setting
high playback levels. Because of their
tremendous reserve of clean power, Krell
amplifiers can safely drive speakers to high-
er sound pressure levels than other ampli-
fiers. Always turn the level down at the first
sign of speaker distress.
On~Off and Standby Operation
When powering up any system, amplifiers
should always be turned on last and turned off
first.
1. Press the power button on the front panel
of the amplifier. You will hear a click. The
amplifier is ready for operation.
2. With the preamplifier in the Mute position,
or ’the volume control fully attenuated,
select a source. Turn the volume control
up to the desired listening level.
3.
When turning the system off, lower the
volume of the preamplifier completely or
place it into the Mute or Stand-by posi-
tion. Switch the amplifier to Stand-by by
pressing the power button. It is now safe
to turn off the rest of the system.
System Noise Considerations
AC grounding becomes critical when con-
necting high performance audio components.
When mixing and matching audio compo-
nents, each with their own ground potential, a
low frequency hum may occur in one or both
speakers. This often occurs when introducing
¯ a new component into a system.
If there is a low frequency hum emanating
from the speakers when the KAV-250a
amplifier is placed into the system, follow
these simple trouble-shooting steps before
contacting your authorized Krell dealer, dis-
tributor, or Krell®:
1.
Check all input and output connections,
making sure they are of sound construc-
tion. With the amplifier Off, remove the
interconnect wiring and turn the amplifier
On. If the hum disappears, turn the ampli-
fier Off and reinsert one of the intercdn-
nect cables. Then turn the amplifier back
On. If the hum reappears with one or both
interconnects reinserted, there may be a
defective cable. Have the interconnect
cabling checked before proceeding.
2. If the interconnects prove to be sound,
you may be experiencing a ground loop.
This can often be easily eliminated. Con-
tact your authorized Krell dealer, distribu-
tor, or Krell
®.
English Page 7 of 12 KRELL
®
KAV-250a