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The Q2B siren is an electromechanical siren that has one of the most noticeable sounds in the world. The Q2B or "Q-siren" is famous for its sound, which is trademarked, and the look of the siren. It is produced by the Federal Signal Corporation.


The siren was used on police vehicles, ambulances, fire apparatus and other emergency vehicles before there were electronic sirens which have widely replaced the Q-siren, except on fire apparatus and similar emergency vehicles large enough to handle the Q's current draw. In the early 1950s the only siren sound were the ones made by the electromechanical sirens. The siren had its beginnings in World War II when similar designs and similar sounding sirens were used as air raid sirens. After the war was over, Federal Signal Corporation began to sell the siren to different police departments and fire rescue departments. The siren quickly became popular as one of the most effective traffic clearing devices.

Present day

Today Federal Signal's Q2B siren is still in wide use. The majority of users of the Q Siren are fire departments, although some ambulances and heavy rescue squads have employed the Q-siren. The Q-siren produces 123 decibels at 10 feet at an operating current of 100 amps @ 12vdc (1.2kw).http://www.fedsig.com/products/111/q_siren The Q-siren's manual and the Federal Signal website state that "this product produces LOUD sounds for requesting the right of way". Hearing...
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