Managing the acoustic comfort in a room, means to know sound absorption characteristics of materials that can be used for finishes the inside surfaces (walls, floors, ceilings) of the room. Tests in reverberation room must be done for determine the phono-absorption characteristics. In many research projects, laboratory experiments were carried out on several types of materials, classic types and also different modern, ecological materials. The results of the studies are compared, considering the influence of the characteristics (dimensional, etc.) of the materials from which there are manufactured.
