11
Installation Instructions
Description, Specifications, and Installation Manual
Federal Signal
www.fedsig.com
DSA6 Wiring Options
A DSA6 speaker requires 600 W of power or two UV400 amplifiers with one at 100% and
the other at 50%. Equip a UV Controller with six UV400 amplifiers to power four DSA6s.
Use the remaining two UV400 amplifiers for two DSA4s or other combinations up to
800 watts. See “Figure 20 Wiring Options Continued.”
Mixing DSA Speakers Wiring Options
DSA4 speakers always use a single UV400 amplifier. You can mix DSA2 and DSA6 to use
the UV400 amplifiers efficiently. When wiring different DSA speakers together, be careful
to follow the wiring diagrams to ensure drivers are always in series or series/parallel
arrangement. See Figures 19 and 20 for wiring examples.
Installation Instructions
Determine a Suitable Location
The information in this section provides guidelines to aid you in selecting installation sites
that make the best possible use of the speaker array siren.
SOUND HAZARD: The sound output level of some DSA sirens is capable of
causing permanent hearing damage. To prevent excessive exposure, carefully
plan the placement of the sirens and post warnings.
Do not expose personnel to sound levels above 123 dBC.
When the sirens are used out of doors, people indoors may not be able to hear the
warning signals. You may need separate warning devices or procedures to warn
people indoors effectively.
Careful consideration of the factors affecting the propagation of sound from the siren and
the response of the human ear to the sound will optimize the ability of the siren to warn
the community effectively.
The reduction of signal intensity as distance from the siren increases and the minimum
desired signal level at the fringe of the area to be covered are important considerations
when choosing a siren installation site. As the distance from the siren increases, sound
level losses accumulate. These losses result from weather conditions, the terrain,
obstructions in the sound path, and the pitch of the sound and the height of the siren.
Optimum sound propagation conditions occur when no obstructions exist in the sound
path, the terrain is hard and flat, and the air is blowing away from the source. Under these
conditions, you can expect a 6 dB loss per distance doubled. A loss per distance doubled
of 10 dB is typically experienced because the atmosphere is rarely calm, terrain may not
be flat, and buildings or other obstructions are frequently present in the sound path.
