Troubleshooting System Noise
AC grounding becomes critical when connecting high-performance audio compo- nents. 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 loud- speakers. This often occurs when introducing a new component into a system.
If this happens when you place the Evolution amplifier into your system, follow these simple troubleshooting steps.
Note
During these steps, the back panel power breaker switch remains in the on position.
1.Check that all input and output connections are of sound construction.
2.With the amplifier in stand-by mode, remove the interconnect cables, then turn the amplifier on. If the hum disappears, turn the amplifier into stand-by mode again, and reinsert one of the interconnect cables. Turn the amplifier 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 checked.
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.
How to Evaluate Amplifier Operation
The amplifiers are protected by a series of non-intrusive circuits that constantly evaluate the amplifier’s operation. This circuitry protects against damaging DC input or output, and short circuits. The protection circuitry in an Evolution amplifier is designed to prevent damage to the amplifiers or loudspeakers caused by other defective components, faulty wiring, system mishandling, or amplifier failure.
