Evolution Technologies 222 - Manual (Page 43)

43
Troubleshooting System Noise
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.
If this happens when you place the Evolution 222 preamplifier into your system,
follow these simple troubleshooting steps.
1. Check that all input and output connections are of sound construction.
2. With the preamplifier off, remove the interconnect cables, then turn the pream-
plifier on. If the hum disappears, turn the preamplifier off and reinsert one of
the interconnect cables. Turn the preamplifier 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 replaced.
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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