The amplification process by the first part of the sound source, and then through the mixer, assembled the newsletter, then sent to the amplifiers, the amplifier for the processing of signal amplification, finally sent to the speaker. Amplification system is put some tiny voice up to can give hundreds of thousands of people have heard.

A basic amplification system to have more equipment is unassailable, and such a system is a very basic, in general it's not a requirement of the case is ok. But in a different environment, sound source, the amplification of sound request these factors exist, public address system shall attach some equipment to help to achieve the whole process of amplification can be perfect. These basic equipment, is the so-called peripheral equipment.

(1), compressors, limiter

This is a kind of the amplifier gain change with the size of the signal. Its role is to carry on the dynamic range of the audio signal compression or extension, so as to achieve beautification signals, to prevent distortion, or noise, such as a variety of different purposes.

(2), the noise gate

Most used in drum group, for prevent the radio receiver, the crosstalk between the other application range are also quite a lot. Noise gate is an electronic circuit, when the input signal level over the threshold of adjustable, through the circuit, signal by then.

(3), the equalizer

Based on different frequencies or frequency signal for ascension, decay, or removal, in order to achieve sound processing beautification and the purpose of improving channel transmission quality.

(4), frequency divider,

In order to improve the work efficiency of the power amplifier, reduce the frequency of the sound distortion degree, improve the quality of sound. Divider audio distribution, the signal to power amplifier amplification of each frequency band.

(5), the effect is

By mechanical or electronic method of analog closed indoor voice signal characteristics of time delay and reverb, make music more rich and, and can make some special sound effects.

6, delayer

In some large, need more than one set of speakers for amplification system, often need it to be delayed. Because the sound of different location of the speaker to the listener's ears is the absolute successively, so in order to improve the sound quality, does not have the feeling of different images and sound. The delayer signal as delay processing, set due order.

All landowners, actuator,

In the original music signal of intermediate frequency region to join the appropriate harmonic component, to simulate the environment reflection when live performances, the signal is more distinct presence and fine feeling, and the more penetrating.

Today, feedback suppressor

Feedback of the main reason is that the sound transmission gain of the receiver is too big, too close to the distance of the microphone and speakers, or sound field in the state of certain frequency of sound reflection too active, causing the circularity of amplification of sound. Signal input feedback suppressor, generally can be any feedback frequency of 50 hz to 15 KHZ into phase shifter, phase shift processing, then the input audio signal into is machine, the audio signal will filter out the noise frequency feedback.