Krell Industries 6 - Manual (Page 17)

Troubleshooting System Noise
Krell Showcase Amplifier 13
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
Showcase Amplifier into your system, follow these simple trou-
bleshooting 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 con-
nect 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 inter-
connect cable.
7. If all the interconnect cables appear to be sound, and you still
have hum, you may be experiencing a ground loop. Please
contact your authorized Krell dealer, distributor, or Krell for sug-
gestions on how to eliminate the hum.