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Audio in any human language, music and other sounds, including natural environment noise, animal sounds, machine tool sound, action sends a voice. Audio power amplifier, probably including Zhoubian equipment (including limiter, effects, equalizer, VCD, DVD etc.), speaker ( speaker, speaker) mixer, microphone, add up to a set of display device and so on. The speaker 's voice output device, speakers, subwoofer and so on. A speaker includes high and low, three speakers, three but not necessarily three.