The public address Loudspeaker horn system is a systematic project, which requires the close cooperation of various disciplines such as electronic technology, electro-acoustic technology, acoustic technology and acoustic art. The sound effect of the public address system is not only related to the comprehensive performance of the electro-acoustic system, but also to Sound propagation environment Architectural acoustics is closely related to the use of on-site tuning, so the final effect of the public address system requires the best combination of correct and reasonable electro-acoustic system design and debugging, good sound propagation conditions and correct on-site tuning technology. The three complement each other and are indispensable. The above problems must be comprehensively considered in the PA loudspeaker system design. On the basis of selecting electro-acoustic equipment with good performance, through careful system design, careful system debugging and good acoustic conditions, the electro-acoustic pleasant and natural sound effect can be achieved.
Background music
Back ground music (BGM for short), its main function is to cover up the noise and create a relaxed and harmonious atmosphere. If the listener does not pay attention, they cannot identify the location of the sound source, and the volume is low, which is a way to create a relaxed and pleasant environment. Atmospheric music. Therefore, there are two effects of background music, one is to psychologically mask the ambient noise, and the other is to create an atmosphere that is compatible with the indoor environment.
The public address system includes background music and emergency broadcast functions, which are usually combined together. Its object is public places and is installed in corridors, elevator entrances, elevator cars, halls, shopping malls, restaurants, bars, banquet halls, community gardens, etc. Combined sound column or scattered speaker box, usually play background music, when an emergency occurs, it is strongly cut to emergency broadcast, and it is used to direct the evacuation of the crowd.
control function
The public address system has many control functions, such as constituency broadcast and all-call broadcast function, forced switching function and priority broadcast function. The loudspeaker load of the public address system is large and scattered, and the transmission line is long. In order to reduce the loss of the transmission line, 70V or 100V constant voltage high impedance transmission is generally used. The sound pressure requirements are not high, and the sound quality is dominated by mid-range and mid-high range. The microphone for broadcasting in this system is generally not in the same room as the loudspeaker for broadcasting to the public, so there is no problem of acoustic feedback.