When the two identical sound signals have a phase difference of 180 degrees, the vibration direction between the sounds of the sound box or the sound of the microphone under the same sound inversion also belongs to the opposite phase. The audio system has four kinds of speakers, such as inversion of the speaker in the array composed of left and right channels. Opposite phase, true phase opposite phase (that is, the phase between the input signal and the output signal), the phase inversion between the microphones, and the inversion of some of the speakers in the array of multiple speakers. Inversion can cause acoustic short-circuits (that is, the sounds cancel each other out, the volume decreases), the loss of localization of the sound image, and bass turbidity, which can damage the reproduced sound.
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