A speaker is a device that converts electrical signals into sound, mainly composed of components such as a diaphragm, magnetic ring, and conductive coil. An electrical signal generates a magnetic field in a conductive coil, which causes the diaphragm to move and produce sound.

A Professional Compression Driver Unit is commonly used for tweeters in audio equipment, mainly composed of conductor coils, diaphragms, and magnetic sections.

A subwoofer is a speaker used in a sound system to play low-frequency sound effects, usually also known as a subwoofer or subwoofer. The bass speaker mainly consists of components such as diaphragm, magnetic ring, and wire coil.