Classe Audio CP-700 Owner's Manual page 40

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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.