Acoustic range

To select the correct product to be installed the sound spectrum of the siren must be superimposed upon the sound spectrum of the ambient noise. The differential dB level and the differential frequencies Hz are therefore immediately recognized.
Additional factors to be considered when selecting an audible warning device.

Electric Motor Sirens are suitable for short duty cycle and not for continuous operation. They produce a single tone sound and reach their specified operating frequency quickly. A single sound is very effective but can be easily accustomed to and looses its effectiveness after a short time: to improve the sound output a modulated or intermittent tone can be obtained by using a modulator.

Horns and Bells produce distinct sounds which are easily distinguishable. These products have low frequencies and are suitable for a variety of signalling applications especially long distance, short call signals or danger signals. They produce a continuous sound that can be changed to intermittent by using a modulator.

Piezoelectric audible warning signals have very distinct sound frequencies often over 2000 Hz used for signalling in restricted areas. These high-pitched frequencies make them extremely distinguishable.

Electronic Sirens. Magneto dynamic and exponential horn electronic sirens have a high frequency sound output suitable for short distance use. In general, electronic sirens have the following advantages over electric motor sirens:
- Low power consumption
- Greater sound output with volume adjustment
- Variable tone in the sound frequency
- Progressive sound
- Continuous operation
- Combined audible/visual signal