-produce stronger and further reaching sound than electronic sirens while providing far better reliability.
-can target the alerting signal to the most at risk population.
-are more reliable, longer lasting, durable and cost effective than electronic sirens.
-do not rely on a person's ability to understand as well as hear the signal. "Speaker" systems may not be intelligible in every place that it is audible due to echoes, language barriers, and garbling due to the multiple arrival effect.
-are MUCH less susceptible to lightning strikes and power surges than electronic sirens.
-“..present a distinct advantage.. over rotational devices,” according to FEMA’s warning system guide. It says “a rotational device will have an overall lower dB level when assessed across a given time period than an Omni-directional device operating at the same frequency. Additionally, because sound has a reinforcing effect, Omni-directional devices can act as sound “boosters” with adjacent audible devices." (4.4.5 FEMA OWS Technical Bulletin 2.0)
- Further, the guide states: “Omni-directional sirens provide a greater area of coverage than do rotating or directional devices. They provide a more constant signal that improves public alerting, therefore Omni-directional sirens can be used to good advantage in areas with high population density and in areas with high ambient noise levels.” (4.4.5 FEMA OWS Technical Bulletin 2.0)
Sentry Siren, Inc.
2812 N. 9th St.
P.O. Box 386
Canon City, CO 81212