A speaker is a device that can transform audio signals into sound. In simpler terms, it refers to a speaker enclosure or subwoofer enclosure that comes with its own amplifier, which amplifies the audio signal and outputs the sound directly from the speaker, making the sound louder.

The speaker is the terminal of the entire audio system. Its function is to convert audio electrical energy into corresponding sound energy and radiate it into space. It is an extremely important component of the audio system and is responsible for converting electrical signals into audible sound signals for direct human listening.