When the speaker vibrates, the density (or air pressure) of the air in front of and behind the cone (or diaphragm) changes exactly and the direction is opposite, that is, the phase difference is 180 degrees. When the frequency is low, the compressed air in front of the cone bypasses the speaker to fill up the sparse air in the cone, and the two front and back parts cancel each other out, weakening the radiation ability and causing an acoustic short circuit. In order to avoid short circuits, a large plate can be used to separate the front and rear speakers, so that the sound from the front and back of the cone does not interfere with each other. This board which isolates the front and rear sounds of the speaker is a baffle.
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