Questions And Answers - Krell Industries KRC-HR Owner's Reference Manual

QUESTIONS AND ANSWERS
Q. When I turn up the volume on the KRC-HR, a loud hum is present from the
loudspeakers. What could this be?
Ao
Hum can be caused by several different disturbances. Check to make sure
that all of the cables, (in and out of the KRC-HR) are sound and making
proper contact. Make sure that there are no power supplies or hum
inducing components on top of or directly below the KRC-HR.
You could also be experiencing a ground loop in the system. Put a 3-prong
to 2-prong AC adaptor, (cheater plug), on the KRC-HR power cord. The hum
should go away. You may also need to float ground on other system
components, if the hum remains. Please contact your dealer or the product
manufacturer before a non-KRELL component's ground is lifted. Remember
to always keep at least one component grounded. If these suggestions do
not lead to a solution, please consult your dealer or KRELL.
Q. Can the KRC-HR be used to control more than one system?
A. Yes, the KRC-HR has both single-ended
and balanced outputs that can be
used simultaneously to control two different systems, but both systems will
play from the same input, at identical volume settings.
Q. When I select the B-1 input on the KRC-HR, one channel seems to have less
gain than the other. Is something wrong with the preamp?
A. Probably not. The balanced
input or output internal cable terminals could
be attached incorrectly. Locate the channel that appears to have less gain.
Switch the cable connected to that channel's input to the other channel and
vice versa, to determine whether a cable is defective. If there is no difference
in level, do the same thing at the output of the KRC-HR. If the problem is
not the cable, check to make sure that the input and output connections
are connected at the correct locations on the preamp. There should be no
LEDs illuminated in the Balance control section of the front panel
(indicating a level imbalance).
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