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14 Krell Showcase Amplifier
Q. Should I turn the Showcase Amplifier off (unplug the amplifier)
when not playing music?
A. No. Leave the Showcase Amplifier in the stand-by mode when
not playing music. The stand-by mode avoids cold starts as well
as minimizes heat output and power consumption. Turn the
amplifier off if you plan to be away for a period of time, for
example, on vacation. See Amplifier Operation, on page 12.
Q. When I turn the amplifier on there is a loud hum through the
loudspeakers. What should I do?
A. When a new component is introduced, a low frequency hum
may occur in one or both loudspeakers. Check that all input
and output connections and cables are of sound construction.
See Troubleshooting System Noise, on page 13. If the con-
nections and cables are sound, you may be experiencing a
ground loop. This can often be easily eliminated. Please contact
your authorized Krell dealer, distributor, or Krell for suggestions.
Q. When I connect the amplifier to my system using the single-
ended inputs, a loud buzz comes from my loudspeakers. What
is it?
A. Check that the shorting pins for the Showcase Amplifier are
inserted into the XLR inputs (the unit is shipped with the pins in
place). When using the single-ended inputs, shorting pins must
be inserted between pins 1 and 3 to keep external noise from
corrupting the signal. For more information, see Connecting
the Showcase Amplifier to Your System, on page 10.
Q. I cannot turn the amplifier on. Why not?
A. Make sure the stand-by LED is not flashing. If the stand-by LED
is flashing, unplug the amplifier from the AC wall receptacle and
then plug it back into the AC wall receptacle. If the stand-by
LED continues to flash, contact your Krell-authorized dealer or
distributor, or Krell. If no LEDs are illuminated, check the power
cord and check the AC mains fuse. To remove the fuse, unplug
the power cord from the amplifier and slide out the fuseholder.
Q. I get no signal from one of the amplifier channels when the unit
is on. Why not?
A. Make sure you are not connected to channels 6 or 7 on a
Showcase 5, or to channel 7 on a Showcase 6. If you are using
the single-ended input, make sure the shorting pin is inserted
between pins 1 and 3, and not between pins 2 and 3.