There are two speakers in the front and back of the speaker. One speaker is connected to the amplifier, and the other is connected to the speaker. The phase hole is located at the rear of the speaker. The working principle is different from that of the empty cone speaker. When one speaker vibrates and sounds, the cone of the other speaker also vibrates, and its voice coil vibrates in the magnetic field to generate an audio current. This current act on the self-aligned sound circle and pushes the cone. A small vibration is produced. The sound produced by this vibration is slightly delayed from the original sound for a certain period of time, forming a kind of “reverberation effect”. The sound is specially modified, the sound effect is pure and thick, and the effect of beautification is obvious, but not for big dynamic music.
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