There are differences in the number of input channels (for example, the number of output channels such as 6, 8, 10, 12, 24, etc.), the number of panel function keys, and the output instructions of the mixer. There are even some adjustments. The sound console also has a power amplifier function. What are the main functions?

　　01

　　 One, signal amplification:

The function of amplifying program signals, such as microphones (microphones), radios, CD players, tuners, electronic musical instruments and other different program sources. After entering the mixer, different signals require different amounts of amplification , So the mixer must be able to handle different signals separately, such as the musical signal and the human voice signal of an instrument during a performance are not the same in amplitude.

In order to adapt to the different levels of the input signal, the mixer usually has two sockets at the input end of the mixer, high level (line input) and low level (microphone input). The former mainly accepts recorders, CD players, and tuners. The input signal can also accept the strong signal returned from the reverberator and other devices, and the latter accepts the weak signal from the microphone and performs sufficient amplification.

　　02

　　 2. Signal processing:

　　 The most basic signal processing is frequency equalization (that is, tuning). Each input channel of the mixer is equipped with a frequency equalizer (EQ). Different signals have different timbres due to their frequency spectrum and harmonic components. At the same time, the impact of buildings on the sound in different places will also have timbre changes. For example, we are in some closed spaces. For example, the sound of singing in the daily bathroom will be more reverberant than in an open place.

　　 The tuner should enhance or attenuate the different frequencies of the sound according to the requirements of the program content to beautify the timbre of the sound source. According to different sound reinforcement environments, the different sound signals entering the mixer are processed separately to make the sound as close to the original sound as possible.

　　 For example, input audio signals from microphones, recorders, CD players and other equipment into the mixer for mixing and synthesis, and individually adjusting the tone of any audio channel. There are functions such as gain, treble, midrange, bass, delay, reverb, left and right size, and equalization.

　　 Each channel of the mixer has the same processing methods, such as: 3-band equalization, gain controller, high-pass filter, etc. Setting these in the input channel can eliminate some noise in the program signal.