The device is intended for sound coverage (voice acting) of residential and industrial development and other areas as part of various systems, packages, equipment, etc. It is used under conditions of increased ambient noise and under other severe conditions. It can be based on various vehicles (cars, helicopters, etc.), at watchtowers and tall buildings in cities, as well as in premises (port, shop, railway station and other premises). Main application area is EMERCOM divisions. Besides main application area, the device can be used during police and military operations, on coast defense ships, for the purpose of civil defense, protection of various territories, in rescue operations, at hazardous production facilities, etc.
AI-300 acoustic radiator ensures electric energy conversion into acoustic energy of direct effect and a possibility to develop high sound pressure required for message transmission for long distances. Its can be equipped with an additional horn. The device corresponds to requirements to stability, strength and resistance to external factors for versions 1.3 as per GOST RV 20.39.304-98 for macroclimatic areas with boreal climate (UKhL).
It provides for a possibility to adjust a radiator to each certain task. Installation of an additional horn makes it possible to do the following: – increase sound pressure level by 1.5 dB. – shift the lower frequency limit from 400 up to 350 Hz. – change directional diagram in a horizontal plane from 40° to 30°. Exclusion of an additional horn from the device configuration makes it possible to do the following: – decrease dimensions from 500х140х560 to 205х140х410 mm. – save extra 1.4 kg.
MAIN PARAMETERS AND CHARACTERISTICS OF AI-300 ACOUSTIC RADIATOR
PACKAGES (UNITS) OF AI-300 RADIATORS
On lateral surfaces of the acoustic radiator there are 16 holes (8 per each side) intended for radiator connection to each other.
Radiators assembled into packages form a united front of acoustic wave including interference attenuations. This is a fundamental advantage of AI-300 as compared to its competitors. It makes it possible to obtain a 5 dB gain for each duplication of the number of radiators. (A majority of usual loudspeakers have a spherical wave form, which in case of their number increase leads to significant interference and a gain of only 3 dB).
A number of radiators assembled into one unit and sound pressure level generated by them shall be restricted by their dimensions.
SIREN SIGNAL ATTENUATION WITH INCREASE OF DISTANCE
ATTENUATION DIAGRAM (RELATIONSHIP BETWEEN SOUND PRESSURE AND DISTANCE