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Krell KAV–2250 and KAV–3250
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 all loudspeakers. If this
happens when you place the amplifier into your system, follow these simple
troubleshooting steps:
1. Check that all input and output connections are of sound construction.
2. With the amplifier off, remove all the interconnect cables, then turn the amplifier
on. If the hum disappears, turn the amplifier off and reinsert one of the
interconnect cables. Turn the amplifier back on.
3. If the hum reappears with the interconnect cable reinserted, the cable may need
to be replaced. Turn the amplifier off and connect a different interconnect cable to
the same location. Turn the amplifier back on.
4. If the hum disappears with the interconnect cable reinserted, that cable most
likely is sound.
5. Turn the amplifier off, disconnect the interconnect cable, and re-connect one of
the other interconnect cables.
6. Repeat steps 3 through 5 until you have checked each interconnect cable
individually.
7. If all the interconnect cables appear to be sound, and if you still have hum, you
may be experiencing a ground loop. Please contact your authorized Krell dealer,
distributor, or Krell for suggestions on how to eliminate it.