Troubleshooting System Noise - Krell Industries Evolution e series Owner's Reference Manual

SIX
SECTION

Troubleshooting System Noise

AC grounding becomes critical when connecting high-performance audio components.
When you mix and match high-performance audio components, each with its own ground
potential, a low frequency hum may occur in one or both loudspeakers. This often occurs
when introducing a new component into a system.
If this happens when you place the Evolution e Series amplifier into your system, follow
these simple troubleshooting steps.
Note
During these steps, the back panel power breaker switch remains in the on position.
1.
Check that all input and output connections are of sound construction.
2.
With the amplifier in stand-by mode, remove the interconnect cables, then turn the
amplifier on. If the hum disappears, turn the amplifier into stand-by mode again, and
reinsert one of the interconnect cables. Turn the amplifier back on. Repeat this process
for each cable.
3.
If the hum reappears with one or both interconnect cables reinserted, the cable needs
to be checked.
4.
If the interconnect cables are sound, you may be experiencing a ground loop. Please
contact your authorized Krell dealer, distributor, or Krell for suggestions on how to
eliminate the ground loop.
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