PA sound system, also known as a professional sound system. There is a misunderstanding that the sound reinforcement system is very simple, as long as the microphone (and other sound source), mixer, power amplifier and speaker box will be able to link the composition of a sound reinforcement works. This caused many owners to understand as much of the money invested, could be the language of PA is that the sound vague, feedback啸叫interference can not be opened so that sound great, music playback sound quality when listening to the insipid tone.

sound reinforcement system is a systematic project involving electronic technology, electro-acoustic technology, construction technology and the acoustic sound of a variety of artistic disciplines, but also with the video system at the same time (multi-media projection and camera systems), the stage or disco lighting system , fire radio system, radio paging systems and subsystems such as security system, close cooperation and coordination. Not only the sound effects sound reinforcement system with electro-acoustic system performance, but also the spread of the sound environment - architectural acoustics and is closely related to the use of the site mixer. The use of sound reinforcement system functions and sound effects involved in the correct and reasonable audio system design and debugging, the voice of the dissemination of good conditions and the right technology at the scene three tuning the best combination. Like electro-acoustic systems in vehicles on highways, building the sound as if the road conditions, as if the tuner drivers. If the safety performance of motor vehicles is a necessary condition for fast driving, then the quality of road surface is a balance, an important basis for fast driving, automobile driving skills and experience to ensure that the basic guarantee for safe driving. Three mutually reinforcing, and both are indispensable.

sound reinforcement system as a system, system design must be considered in the above-mentioned problems. Good performance in the selection of the basis of electro-acoustic equipment, through careful system design, detailed system debugging, and good conditions to build the sound to pleasant, natural sound effects.

a sound reinforcement system of classification

PA sound system and sound reinforcement system includes two major categories aloud system:

1. Sound reinforcement system: speakers and a microphone out in the same venue, there is the sound caused by feedback and room resonance啸叫, distortion and oscillation. To ensure stability and normal operation of the system, the maximum available gain of the system than the occurrence of acoustic feedback self-excitation of low threshold gain 6dB.

2. Burst system: the system, only tape drives, CD-ROMs and other sound source, there is no microphone, there is no acoustic feedback possible, acoustic feedback coefficient is 0, is a special case of sound reinforcement system.

sound reinforcement sound system by end-use can be divided into the following categories:

1) outdoor sound reinforcement system

sound reinforcement system is mainly used for outdoor stadium, railway stations, parks, art squares, fountains and other music. Its service area is characterized by large, wide space, large background noise; sound to direct sound-based dissemination; required high sound pressure level, if high-rise buildings surrounded by objects, such as acoustic, speaker layout and is not quite rational, sound waves by formed by multiple reflections of more than more than 50ms delay, give rise to double or multiple acoustic sound, and there will be serious issues such as echo, voice clarity and audio-visual orientation. Outdoor sound system is also affected by climatic conditions, such as wind direction and the impact of environmental interference.

2) indoor sound reinforcement system

indoor sound reinforcement system is the most widely used system, including various types of theaters, gymnasiums, dance halls and so on. Its highly professional, both non-verbal reinforcement, while the use of theatrical performances for all kinds of high quality requirements. System design should not only consider the issue of electro-acoustic technology, but also involves the issue of architectural acoustics. Factors such as room shape has a greater impact on sound quality.

3) mobile performance systems

fixed installation sound reinforcement system in addition to mobile systems also outside the system. Commonly used in a variety of large venues [such as the stadium (Museum), art radio and a large banquet hall, etc.] of non-theatrical performance of the system with the installation of said temporary mobile performance systems. Mobile performance stereo equipment must be compact, easy to carry, transport and installation, high reliability and can adapt to the use of a variety of harsh environment. Investment in large-scale flow system in large, usually to the use of professional audio rental company.

4) the public address system

public address system for hotels, commercial buildings, ports, airports, subways, schools with background music and radio programs. In recent years, the public address system is also taking emergency radio, fire alarm systems can be linked. Public Broadcasting System more control functions, such as broadcasting and the entire constituency called radio function, forced to switch functions and features, such as the priority right to broadcast. Speaker load and more dispersed, long transmission lines. In order to reduce transmission line loss is generally determined using 70V or 100V voltage high-impedance transmission. Sound pressure level do not require high quality alt-oriented in tone.