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Alarm Horn Sounds

Unlike mechanical sirens, pneumatic alarm sirens can create a two-tone sound. Pneumatic sirens with horns are typically used on ships. The bigger the ship, the lower the sound of the horn. The Sounddogs Archive features some very nice recordings of ship horn sounds and pneumatic sirens. Below you will find an impressive example of a big ship's signal horn.

Alarm Horn Siren Sounds

Pneumatic alarm sirens can create enormous sound pressure and spread it across big distances thanks to the horns mounted on the top of the siren. The construction of pneumatic alarm sirens is different from mechanical sirens. While the mechanical siren creates the airstream with the help of centrifugal forces, the pneumatic alarm siren uses a compressed air canister to pump the airstream into the siren head.

Alarm Horn Siren

The air-powered alarm siren (pneumatic siren) is easily identified by the horns mounted to the siren's head. Similar to a mechanical siren, the air-powered alarm sirens create their signal by interrupting the air-stream cycle with the help of a perforated disc. The spinning disc inside the siren's head is called a rotor; it is electrically powered. The air-stream is directed through the holes in the rotor and external vents. The spinning motion of the rotor either opens or closes the holes, which creates the sound of the siren that is then directed to several horns. The air-stream that is needed for the operation of the siren is created by an Aerosol canister underneath the siren.

The main benefit of this type of siren is the extremely high sound level it creates. Pneumatic sirens can reach a sound pressure level of 130db (!) at a distance of 20 meters. The other benefit is the use of pressurised air. With the help of compressed air from a tank, these sirens can create a very high sound level almost immediately, which is very important for the proper operation of a siren. Pneumatic sirens also need less electrical power than mechanical sirens (but they do require more maintenance).
Many of these high-performance sirens were de-installed after the Cold War because they were no longer used. You can still see the pylons that those big old sirens used to be attached to (although nowadays they are more likely to house a mobile antenna than a siren).

Two-tone Horns Sounds

Unlike mechanical sirens, pneumatic alarm sirens can create a two-tone sound. Pneumatic sirens with horns are typically used on ships. The bigger the ship, the lower the sound of the horn. The Sounddogs Archive features some very nice recordings of ship horn sounds and pneumatic sirens. Below you will find an impressive example of a big ship's signal horn.

1 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Squeak,Rubber Duck,Ala Sound Effects Waveform Horn,Squeak,Rubber Duck,Ala.wav 1.70* Alarm, Horn: Horn Squeak Rubber Duck Alarm 2.0

Alarm

Alarm Horn

0:01 16 Bit / 48000 kHz 90880 Sounddogs Sound Library
2 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Boat,3,Short,Even,Echo Sound Effects Waveform Horn,Boat,3,Short,Even,Echo.wav 2.60* Alarm, Horn: Horn Boat 3 Short Even Echo 1.0 Alarm Alarm Horn 0:06 16 Bit / 48000 kHz 90857 Sounddogs Sound Library
3 Sounddogs Sound Library Sounddogs Alarm Category, Horn,GrandAm,2 Honks,Static Sound Effects Waveform Horn,GrandAm,2 Honks,Static.wav 1.70* Alarm, Horn: Horn GrandAm 2 Honks Static 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90868 Sounddogs Sound Library
4 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Shaman,Hoots,Buzz Sound Effects Waveform Horn,Shaman,Hoots,Buzz.wav 1.70* Alarm, Horn: Horn Shaman Hoots Buzz 2.0 Alarm Alarm Horn 0:03 16 Bit / 48000 kHz 90879 Sounddogs Sound Library
5 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Truck,Doppler,Long,Awa Sound Effects Waveform Horn,Truck,Doppler,Long,Awa.wav 2.60* Alarm, Horn: Horn Truck Doppler Long Away 1.0 Alarm Alarm Horn 0:06 16 Bit / 48000 kHz 90890 Sounddogs Sound Library
6 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Boat,Tug,5,Short,Even Sound Effects Waveform Horn,Boat,Tug,5,Short,Even.wav 3.40* Alarm, Horn: Horn Boat Tug 5 Short Even 2.0 Alarm Alarm Horn 0:17 16 Bit / 48000 kHz 90861 Sounddogs Sound Library
7 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Harley,Honk,Quick,Once Sound Effects Waveform Horn,Harley,Honk,Quick,Once.wav 1.70* Alarm, Horn: Horn Harley Honk Quick Once 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90872 Sounddogs Sound Library
8 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Squeaks,Rubber Duck,Hi Sound Effects Waveform Horn,Squeaks,Rubber Duck,Hi.wav 1.70* Alarm, Horn: Horn Squeaks Rubber Duck High 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90883 Sounddogs Sound Library
9 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Boat,1,Short,1,Huge,De Sound Effects Waveform Horn,Boat,1,Short,1,Huge,De.wav 1.70* Alarm, Horn: Horn Boat 1 Short 1 Huge Deep 1.0 Alarm Alarm Horn 0:05 16 Bit / 48000 kHz 90854 Sounddogs Sound Library
10 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Doppler,Grand,Honk By Sound Effects Waveform Horn,Doppler,Grand,Honk By.wav 3.40* Alarm, Horn: Horn Doppler Grand Honk By 2.0 Alarm Alarm Horn 0:23 16 Bit / 48000 kHz 90865 Sounddogs Sound Library
11 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Party,Blow,Up Down,Lon Sound Effects Waveform Horn,Party,Blow,Up Down,Lon.wav 1.70* Alarm, Horn: Horn Party Blow Up Down Long 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90876 Sounddogs Sound Library
12 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Toot,Honk,Low Sound Effects Waveform Horn,Toot,Honk,Low.wav 1.70* Alarm, Horn: Horn Toot Honk Low 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90887 Sounddogs Sound Library
13 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Boat,Steam,3,Raspy,BG Sound Effects Waveform Horn,Boat,Steam,3,Raspy,BG.wav 2.60* Alarm, Horn: Horn Boat Steam 3 Raspy BG 2.0 Alarm Alarm Horn 0:06 16 Bit / 48000 kHz 90858 Sounddogs Sound Library
14 Sounddogs Sound Library Sounddogs Alarm Category, Horn,GrandAm,Honk,Med,Stati Sound Effects Waveform Horn,GrandAm,Honk,Med,Stati.wav 1.70* Alarm, Horn: Horn GrandAm Honk Med Static 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90869 Sounddogs Sound Library
15 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Truck,Single,Long,Nasa Sound Effects Waveform Horn,Truck,Single,Long,Nasa.wav 1.70* Alarm, Horn: Horn Truck Single Long Nasal 1.0 Alarm Alarm Horn 0:03 16 Bit / 48000 kHz 90891 Sounddogs Sound Library
16 BBC Sound Effects Library BBC Alarm Category, Horns.BBC.EC3W2 Sound Effects Waveform Horns.BBC.EC3W2.wav 3.40* Alarm, Horn: Sirens And Bells: Air Horn 2.0 Alarm Alarm Horn 0:34 16 Bit / 44100 kHz 26415 BBC Sound Effects Library
17 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Doppler,By,GrandAm,Lon Sound Effects Waveform Horn,Doppler,By,GrandAm,Lon.wav 3.40* Alarm, Horn: Horn Doppler By GrandAm Long 2.0 Alarm Alarm Horn 0:24 16 Bit / 48000 kHz 90862 Sounddogs Sound Library
18 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Harley,Honk,Twice,Med Sound Effects Waveform Horn,Harley,Honk,Twice,Med.wav 1.70* Alarm, Horn: Horn Harley Honk Twice Med 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90873 Sounddogs Sound Library
19 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Squeaks,Rubber Duck Sound Effects Waveform Horn,Squeaks,Rubber Duck.wav 1.70* Alarm, Horn: Horn Squeaks Rubber Duck 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90884 Sounddogs Sound Library
20 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Boat,2,Fast,1,Slow,Ech Sound Effects Waveform Horn,Boat,2,Fast,1,Slow,Ech.wav 2.60* Alarm, Horn: Horn Boat 2 Fast 1 Slow Echo 1.0 Alarm Alarm Horn 0:07 16 Bit / 48000 kHz 90855 Sounddogs Sound Library
21 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Doppler,Honking By,Hap Sound Effects Waveform Horn,Doppler,Honking By,Hap.wav 3.40* Alarm, Horn: Horn Doppler Honking By Happy 2.0 Alarm Alarm Horn 0:17 16 Bit / 48000 kHz 90866 Sounddogs Sound Library
22 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Party,Metal,Blow,Long Sound Effects Waveform Horn,Party,Metal,Blow,Long.wav 1.70* Alarm, Horn: Horn Party Metal Blow Long 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90877 Sounddogs Sound Library
23 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Toots,Honks,2,High Sound Effects Waveform Horn,Toots,Honks,2,High.wav 1.70* Alarm, Horn: Horn Toots Honks 2 High 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90888 Sounddogs Sound Library
24 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Boat,Tug,1,Airy,Echo Sound Effects Waveform Horn,Boat,Tug,1,Airy,Echo.wav 2.60* Alarm, Horn: Horn Boat Tug 1 Airy Echo 2.0 Alarm Alarm Horn 0:09 16 Bit / 48000 kHz 90859 Sounddogs Sound Library
25 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Harley,By,Fast,Annoyin Sound Effects Waveform Horn,Harley,By,Fast,Annoyin.wav 2.60* Alarm, Horn: Horn Harley By Fast Annoying 2.0 Alarm Alarm Horn 0:09 16 Bit / 48000 kHz 90870 Sounddogs Sound Library
26 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Squeak,Rubber Duck,Hig Sound Effects Waveform Horn,Squeak,Rubber Duck,Hig.wav 1.70* Alarm, Horn: Horn Squeak Rubber Duck High 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90881 Sounddogs Sound Library
27 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Blast,NBA,Time Out,Cro Sound Effects Waveform Horn,Blast,NBA,Time Out,Cro.wav 1.70* Alarm, Horn: Horn Blast NBA Time Out Crowd 2.0 Alarm Alarm Horn 0:03 16 Bit / 48000 kHz 90852 Sounddogs Sound Library
28 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Doppler,By,GrandAm,Too Sound Effects Waveform Horn,Doppler,By,GrandAm,Too.wav 3.40* Alarm, Horn: Horn Doppler By GrandAm Toots 2.0 Alarm Alarm Horn 0:26 16 Bit / 48000 kHz 90863 Sounddogs Sound Library
29 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Party,Blow,Single,Long Sound Effects Waveform Horn,Party,Blow,Single,Long.wav 1.70* Alarm, Horn: Horn Party Blow Single Long 2.0 Alarm Alarm Horn 0:01 16 Bit / 48000 kHz 90874 Sounddogs Sound Library
30 Sounddogs Sound Library Sounddogs Alarm Category, Horn,Steam Boat,Mid,Lazy,Re Sound Effects Waveform Horn,Steam Boat,Mid,Lazy,Re.wav 1.70* Alarm, Horn: Horn Steam Boat Mid Lazy Reverb 1.0 Alarm Alarm Horn 0:05 16 Bit / 48000 kHz 90885 Sounddogs Sound Library