Diffusors are used to treat sound aberrations in rooms such as echoes. They are excellent alternatives or complements to sound absorption because they do not remove sound energy, but can be used to effectively reduce distinct echoes and reflections while still leaving a live sounding space. Compared to a reflective surface, which will cause most of the energy to be reflected off at an angle equal to the angle of incidence, a diffusor will cause the sound energy to be radiated in many directions, hence leading to a more diffusive acoustic space. It is also important that a diffusor spreads reflections in time. Diffusors can aid sound diffusion, but this is not why they are used in many cases; they are more often used to remove coloration and echoes.

QRD diffusors are designed to diffuse sound in either one or two directions. Fractal constructions can be used to extend bandwidth.

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