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Fixed Mounting
Note: Fixed mounting refers to installations that include permanent or semi-permanent mounting and
suspension as well as the hardware used for such mounting and suspension.
The fixed mounting of a loudspeaker requires determining that the methods, hardware, and structure
meet static, shock, dynamic, and any other load requirements for supporting the loudspeaker.
The fixed mounting of loudspeakers may be done with Alto Professional accessories or with load-
rated hardware available from a variety of third-party sources. Because of the hazardous nature of
such work, as well as the potential legal liability, engage with people or companies that specialize in
manufacturing hardware, designing installations, and installing fixed mounting systems whenever
possible.
Sound Level
Permanent hearing loss may be caused by
exposure to extremely high noise levels. The U.S.
Occupational Safety and Health Administration
(OSHA) has specified permissible exposures to
certain
noise
levels.
exposure to high sound pressure levels (SPL) in
excess of these limits may result in hearing loss.
When using equipment capable of generating
high SPL, use hearing protection while such
equipment is under operation.
According
to
OSHA,
Hours per day SPL (dB) Example
8
90
6
92
4
95
3
97
2
100
1.5
102
1
105
0.5
110
0.25 or less
115
Small gig
Train
Subway train
High-level desktop monitors
Classical music concert
Riveting machine
Machine factory
Airport
Rock concert
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