Krell Industries S1500 manual Troubleshooting System Noise, Krell S-1500 Multi-channelAmplifier

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 S–1500 Multi-channel 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 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.

16 Krell S–1500 Multi-channel Amplifier