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2. List of sirens built by Alerting Communicators of America

   en.wikipedia.org/wiki/List_of_sirens_built_by...

   8/8, 8/10, 8/12, 10/10, 10/12, 12/12 1967-1972 (square horn) 1972-1981 (round horn) Rotating 130 dB at 100 ft. Started off using a direct drive 25HP Roots blower with a square horn, redesigned to a belt drive 30 HP blower with round horn. All known recordings are 8/10 port ratio. This siren is similar to Federal Signal's Thunderbolt series ...

3. Vehicle horn - Wikipedia

   en.wikipedia.org/wiki/Vehicle_horn

   György Ligeti's opera Le Grand Macabre features two "Car Horn Preludes" scored for 12 bulb horns, each one tuned to a specific pitch. [12] The hornophone consists of a set of bulb horns tuned to a chromatic scale and arranged as a musical keyboard on a frame like a xylophone. The klaxophone is a similar musical instrument using a set of klaxons.

4. Siren (alarm) - Wikipedia

   en.wikipedia.org/wiki/Siren_(alarm)

   In Germany and some other European countries, the pneumatic two-tone (hi-lo) siren consists of two sets of air horns, one high pitched and the other low pitched. An air compressor blows the air into one set of horns, and then it automatically switches to the other set. As this back and forth switching occurs, the sound changes tones.

5. Car alarm - Wikipedia

   en.wikipedia.org/wiki/Car_alarm

   Frequently, false alarms occur because car alarm owners use high sensitivity settings. This may be the main reason why loud bass frequency sound (loud music, other cars or motorcycles with loud exhaust systems, thunderstorms, etc.) can set off car alarms. The second possible reason is that some parts of the alarm system may be improperly installed.

6. Vuvuzela - Wikipedia

   en.wikipedia.org/wiki/Vuvuzela

   The vuvuzela / v uː v uː ˈ z ɛ l ə / is a horn, with an inexpensive injection-moulded plastic shell about 65 centimetres (2 ft) long, which produces a loud monotone note, typically around B♭ 3 [2] (the first B♭ below middle C). [3] Some models are made in two parts to facilitate storage, and this design also allows pitch variation.

7. Can you blow your horn at other drivers for any reason? What ...

   www.aol.com/blow-horn-other-drivers-reason...

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