12
Installation Instructions
Directional Speaker Array (Models DSA2, DSA4, and DSA6)
Federal Signal www.fedsig.com
Using a 10 dB per distance doubled loss factor, the following sound levels are predicted
for the DSA6:
• 100 feet (30.5 m) the sound level is 121 dB
• 200 feet (61 m) the sound level is 111 dB
• 400 feet (122 m) the sound level is 101 dB
• 800 feet (244 m) the sound level is 91 dB
FEMA studies indicate typical ambient sound levels vary by location as follows:
• Industrial Areas: 70+ dBC
• Urban Areas: 60 dBC
• Rural Areas: 50 dBC
Optimum warning is obtained when the warning signal is at least 10 dB above ambient.
Do not expose personnel to sound levels above 123 dBC.
Wind speed and direction often affect the propagation of sound from the siren.
Consequently, prevailing wind direction may be a significant factor to consider when
selecting the installation site(s) of a small, one or two site siren system. For example, if the
prevailing wind is from the west, it may be desirable to install the siren toward the western
edge of the area to be covered.
Other factors to consider when selecting the installation site(s) include the availability
of suitable electrical power, the access to and ease of installation and maintenance, the
height of surrounding obstructions, and security against vandalism.
Installing the Sirens
SHOCK HAZARD: Electrocution or severe personal injury can occur when making
electrical connections, drilling holes, or lifting equipment. Therefore, installation
should be performed by experienced electricians following national and local
codes.
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 sirens and post warnings.
Most DSA siren installations are on poles. The arrays may also be installed on elevated
vertical surfaces, such as walls or flat horizontal surfaces, such as roofs.
