Krell Industries 222 manual Troubleshooting System Noise, Section Eight

SECTION EIGHT

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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