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Amplifier Operation
IMPORTANT
ON/OFF AND STAND-BY
OPERATION
Note
16
Full Power Balanced amplifiers are easy to install and operate. How-
ever, it is important to exercise care during operation, due to the
amplifiers' enormous power output. Switching between active
sources (such as a CD player, tape monitor, or VCR) without muting
the preamplifier output, or bumping or miscuing a source can gener-
ate large transients at low frequencies. Full Power Balanced ampli-
fiers may generate enough power with these transients to damage
loudspeakers.
Always mute or fully attenuate the preamplifier level when switching
sources.
Do not change input connections to the amplifier when the amplifier
is on.
Use care when setting high playback levels. Because of their tremen-
dous reserves of clean power, Full Power Balanced amplifiers can
safely drive speakers to higher sound pressure levels than other
amplifiers. Lower the volume level at the first sign of loudspeaker dis-
tress.
When powering on any system, turn on amplifiers last. Turn off ampli-
fiers first.
1.
Move the back panel power breaker switch (15) to the up position
to engage the input circuitry and place the amplifier into the
stand-by mode. The front panel blue power stand-by LED (1) illu-
minates.
2.
Press the silver power button (3) on the amplifier front panel. The
blue regulator LED (6) illuminates. Once the regulator provides
power to the output stage, the blue bias LED (2) illuminates. The
Sustained Plateau Bias III system is now engaged. After the pro-
tection circuitry has confirmed that safe operating conditions exist,
the input relays engage. You hear a click. The amplifier is ready for
operation.
If the Krell CAST input is being used, the Krell CAST red LED (5)
illuminates and remains illuminated at all times during stand-by or
on modes.
3.
With the preamplifier muted or volume control completely low-
ered, select a source. Increase the volume control to the desired
listening level.
4.
To turn the amplifier off, place the Full Power Balanced amplifier
in the stand-by mode by pressing the power button on the front
panel. It is now safe to turn off the rest of the system.
For best Full Power Balanced amplifier performance, leave the back
panel power breaker switch on at all times.
Krell Full Power Balanced X Series Power Amplifiers
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