What is Compression?

Compression in audio refers to the process of reducing the dynamic range of a sound signal. Dynamic range is the difference between the loudest and quietest parts of an audio signal. By controlling this range, compression helps make quiet sounds louder and loud sounds more controlled, resulting in a more balanced and consistent audio level.

A compressor works by automatically lowering the volume of a signal once it passes a certain level called the threshold. Additional controls such as ratio, attack, and release determine how strongly and how quickly the compression is applied. For example, compression can smooth out vocal performances, tighten drum sounds, or help instruments sit better together in a mix.

Compression is widely used in recording, mixing, mastering, and live sound. It helps improve clarity, control peaks in volume, and make audio sound more polished and professional. When used carefully, compression enhances the overall balance of a track while preserving the natural character of the sound.