 Planephones diffuse the sound according to specifications which depend on the structure of the material, on the geometry of the design, on the orientation and curvature of the surfaces, and on the plastic volumes occupied.Planephones differ from conventional sound diffusion systems in that the sound acquires the timbral quality of the material employed and, in addition, by diffusing the sound homogeneously along the surface, permits designing the acoustic space.according to the architectural space.