Diffusion refers to the process of uniformly spreading sound energy within an environment. In the context of acoustic treatment, diffusion acts as the functional opposite of absorption. While absorption removes sound energy to reduce reverberation time and "dry out" the room, diffusion preserves this energy but reflects it back into the environment in a dispersed and fragmented manner in various directions.

The use of diffuser panels, which have surfaces with mathematically calculated varying depths and angles, serves to break up strong direct reflections that would cause unwanted echoes. The result is a more homogeneous and immersive sound field, where the sound seems larger and more natural. It is an essential technique in studios to maintain the vitality of the room's sound without the problems of standing waves or metallic echoes, ensuring that the environment does not sound excessively dead.