Loudspeakers emit different sounds according to different material configurations. The paper of drum paper is not necessarily all paper, but also made of metal or synthetic materials. If there is drum paper of P carcass, PP carcass has two types of molding status, namely chip molding and injection molding. The English versions are Sheet and Injection respectively. Different drum papers produce different sound quality. We often use dynamic earphone speakers. The working principle of such speakers is simply the function of the energized conductor (coil) in the magnetic field.
When the AC audio current passes through the coil of the loudspeaker (in the loudspeaker, this is called the voice coil), a corresponding magnetic field is generated in the voice coil. This magnetic field interacts with the magnetic field generated by the built-in permanent magnet on the earphone loudspeaker. Therefore, this force makes the voice coil vibrate with the audio current in the magnetic field of the built-in permanent magnet on the loudspeaker. The diaphragm and voice coil of the earphone loudspeaker are connected together, so the diaphragm also vibrates, The vibration produces the same sound as the original audio signal waveform.