Elaborate on the four major components of the public address system

The public address system is generally used in large-scale venues. The improvement of functions has greatly increased the utilization rate of the public address system. Here are four major components of the public address system.

The public address system is basically divided into four parts: program source equipment, signal amplification and processing equipment, transmission lines and speaker systems.

1. Program source equipment: The program source is usually provided by radio broadcasting, CD, DVD player and recording deck, etc.

Second, signal amplification and processing equipment: including mixers, preamps, power amplifiers and various controllers and audio processing equipment; the most important of these equipments is signal amplification, followed by the choice of signal source, mixer and The functions of preamplifiers are very important. Their basic function is to complete signal selection and preamplification. In addition, they are responsible for various adjustments and control of volume and sound effects; sometimes in order to better frequency equalization and timbre beautification, In addition, the equalizer is separately invested, which is the control center of the entire broadcast sound system; the power amplifier amplifies the signal sent by the preamplifier or mixer, and then pushes the speaker to play through the transmission line.

Third, the transmission line has different requirements according to the system and transmission method: for the auditorium, theater, etc., because the distance between the power amplifier and the speaker is not far away, the direct transmission method of low resistance and large current is generally used, and the transmission line requires a dedicated speaker line For public broadcasting systems, due to the wide service area and long distance, in order to reduce the loss caused by the transmission line, high-voltage transmission is often used. Because the transmission current is small, the requirements on the transmission line are not high.

Fourth, the speaker system: the speaker system requires the entire system to be matched, and the choice of its location must also be realistic. Auditoriums, theaters, and sound quality requirements are high, and speakers are generally used in the development direction of modern public broadcasting technology. For public address systems, because they are not so high in timbre requirements, generally use 3W-6W ceiling speakers.