Classe Audio CP-500 - V2.4 Owner's Manual page 34

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6. There is a mechanical hum coming from the unit.
• This symptom suggests you have a lot of electrical noise on your AC mains
line. Try connecting to another AC circuit (not merely a different plug, but a
different circuit).
• Check to see if you have any halogen lighting or dimmers on the same
circuit as the preamplifier, as they can be the cause of hum in power supply
transformers.
7. There is a noticeable change in volume between one input and another,
even though the volume was not adjusted.
• You may need to adjust the input offset setting to compensate for differences
in output level between source components. Conversely, the input offset
setting may have been adjusted inappropriately. Either way, you can correct
the problem by going to the following location in the menu system:
Menu ➝ system setup ➝ input ➝ input name ➝ offset
where input name is the input which needs to be adjusted.
• If the input that seems incorrect is the phono input, make sure you are using
the proper gain setting for the type of cartridge you are using. If in doubt,
consult with your authorized Classé dealer.