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Troubleshooting System Noise
AC grounding becomes critical when connecting high-performance audio compo-
nents. 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 loud-
speakers. This often occurs when introducing a new component into a system.
If this happens when you place the Evolution 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.
How to Evaluate Amplifier Operation
The amplifiers ar
e pr
otected by a series of non-intr
usive cir
cuits that constantly
evaluate the amplifier
’
s operation. This circuitry protects against damaging DC
input or output, and short circuits. The protection circuitry in an Evolution amplifier
is designed to pr
event damage to the amplifiers or loudspeakers caused by other
defective components, faulty wiring, system mishandling, or amplifier failur
e.
SECTION SIX