Classe Audio SSP-300 - Manual (Page 58)

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6. There is a hum coming from the unit.
✓ This symptom suggests you have a lot of DC offset or other
artifacts 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 surround processor, as they can be the cause
of hum in power supply transformers.
Care & Maintenance
To remove dust from the cabinet of your surround processor, use a feather
duster or a lint-free soft cloth. To remove dirt and fingerprints, we recommend
isopropyl alcohol and a soft cloth. Dampen the cloth with alcohol first and then
lightly clean the surface of the surround processor with the cloth. Do not use
excessive amounts of alcohol that might drip off the cloth and into the surround
processor.
Caution! At no time should liquid cleaners be applied directly to the
surround processor, as direct application of liquids may
result in damage to electronic components within the unit.