The role of the resonance box
Here the horn is the sound source, and the sound waves it emits resonate due to the resonance of the speaker, and the sound is strengthened. This is like a violin. If there are only four strings and no hyacinth-shaped box, it is impossible to resonate, and it is impossible to make such a loud, melodious, sweet sound. The same is true for Hu Qin, which has a cylindrical bell-sounding resonance box.
Similarly, the top and bottom of the drum are cowhide, and the wooden barrel in the middle is the resonance box. I don't know if you have already thought of it. The sound of the drum is so thick and low that it has a lot to do with its thick resonance box. You can try and take the horn of the recorder out of its speakers, and the sound will change. The resonance box is also called a resonant cavity.
Solve the problem of acoustic short circuit
The sound of a single speaker is not ideal. Because at a certain moment, the paper cone moves forward, the air in front is compressed and the density increases, and the air density behind the paper cone must become smaller and become sparse. Therefore, the front and rear sound waves are just reversed. When the sound waves in the back are turned to the front, they will cancel out. This is called a short circuit. (That is, the phase difference is 180 degrees), especially for low frequency sound waves. Therefore, the general speaker bass effect is particularly poor.
If the speaker is placed in the speaker, the speaker board separates the sound waves before and after, or properly processes the two opposite sound waves to provide a normal path for the sound produced by the woofer, so that the low frequency sound waves radiate more effectively. Go out and get the most out of the performance of the woofer. For example, use sound absorbing materials to absorb the sound waves behind the cone to prevent it from interfering (this is the principle of closed speakers).
Or reverse the phase of the sound wave behind the paper cone so that it is in line with the front phase (the phase difference is 360 degrees) and then sent to the front, and the front sound is superimposed (this is the principle of the inverted speaker), so that It will not weaken but will increase the sound.
Improve sound quality
The scientific design of the volume and shape of the speaker can reduce or prevent the generation of standing waves, reduce sound distortion and improve sound quality.
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