But as we all know, the horn speakers themselves don't make sound. The current signal is converted into a sound signal only when the signal current is energized. Therefore, it is realized by energy conversion, and the speaker refers to the electro-acoustic transducer that converts electrical signals into sound signals. The fidelity of loudspeaker energy transfer depends on the performance of the loudspeaker.
The sound of the PA loudspeaker is different according to the configuration of the material. The paper of the drum paper is not all paper, it can also be metal or synthetic material. If there is a drum paper of a PP carcass, then the PP carcass has two molding states, namely sheet molding and injection molding. Different drum papers have different sound quality.
We usually use dynamic headphone speakers. The working principle of this kind of speaker is simply the action of the current-carrying conductor (coil) in the magnetic field.
When AC audio current passes through the coil of the speaker (speaker, this is called the voice coil), a corresponding magnetic field is generated in the voice coil. This magnetic field interacts with the magnetic field created by the permanent magnets built into the headphone speaker, so this force causes the voice coil to vibrate with the audio current in the magnetic field of the permanent magnets built into the speaker.