Legacy Ultra MonoBloc Owner's Manual - page 6
Manual is about: Legacy Audio Amplifier System
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If you wish to clean your Ultra MonoBloc, use diluted ammonia based
window cleaner. Do not use any abrasive cleaners or chemical solvents.
Take care not to damage the aluminum faceplate, since aluminum is a
medium hardness metal and can be scratched by the careless use of tools
during the installation.
The Ultra MonoBloc may overheat and the finish may fade if exposed to
direct sunlight or intense heat sources for prolonged periods.
Save your box and packing material; they may be necessary for moving or
shipping the unit for servicing by the factory.