RCF MC4040, Руководство пользователя

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ENGLISH
10. There are numerous mechanical and electrical factors to be considered
when installing a professional audio system (in addition to those which are
strictly acoustic, such as sound pressure, angles of coverage, frequency
response, etc.).
11. Do not point microphones at near loudspeakers (in order to avoid
feedback).
12. Hearing loss
Exposure to high sound levels can cause permanent hearing loss. The
acoustic pressure level that leads to hearing loss is different from person
to person and depends on the duration of exposure. To prevent potentially
dangerous exposure to high levels of acoustic pressure, anyone who is
exposed to these levels should use adequate protection devices. When
a transducer capable of producing high sound levels is being used, it is
therefore necessary to wear ear plugs or protective earphones.
13. Microphones are to be connected in phase, in order to guarantee a
proper sound reproduction, especially when microphones are adjacent
one another.
14. To prevent inductive effects from causing hum, noise and a bad system
working, microphone cables should be shielded, balanced and not be
laid together with other electric cables (mains) and loudspeaker lines.
15. Keep the microphone far from any excessive heat source. Do not use
solvents, alcohol, benzene or other volatile substances for cleaning the
external parts.