Professional stage sound equipment plays an important role in rendering the stage atmosphere, enhancing the visual and auditory stimulation of the audience, and enhancing the artistic expression plays an important role.

1. Mixer: with multiple channel input, each channel of sound can be processed separately, and  has a left, right channel, mix, monitor and other outputs of a sound mixing device.

2. Amplifier: the audio voltage signal into a fixed power signal for driving the speaker sound equipment. Amplifier power matching conditions are the output impedance of the amplifier is equal to the speaker load impedance, as well as the output power of the amplifier and the speaker nominal power to match.

3. Audio processor：also known as a digital processor, is the processing of digital signals, internal with a fixed processing module, such as crossover, delay, mixing, etc.. Used to connect the mixer to the amplifier between, to do signal processing purposes.

4. Crossover: The circuit or device to achieve crossover is called a crossover. There are many types of crossover, according to the different waveforms of its crossover signal, there are two kinds of sine crossover and pulse crossover. Its basic role is, according to the requirements of the combination of speakers, the full-band sound frequency signal into different frequency bands, so that the speaker unit to get the appropriate band excitation signal, working in the best state.

5. Equalizer：Equalizer is a different frequency boost, attenuation, adjust the ratio of bass, midrange, treble equipment.

6. Speaker：speakers are devices that convert electrical signals into acoustic signals. Speaker, also known as speaker box, is the speaker unit into the box device, it is not the pronunciation of parts, but to show and enrich the bass help sound components. Broadly speaking, they can be divided into three types: closed speakers, inverted speakers, labyrinth speakers. Speaker equipment is quite concerned about the location factor given to it when the stage is built.

7. Microphone：Microphone is an electro-acoustic converter of sound into electrical signals. It is a diverse unit in the sound system. According to its directivity can be divided into non-directional (round) directional (cardioid, supercardioid) and strong directional. Used for art stage and news interviews.

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