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Reverberation Room

The perfect reverberation room has walls made of a very hard material, so that the sound is reflected with as little energy absorption as possible and sounds for a long time after the sound emitter has been turned off. In order to avoid flutter echo in the resulting sound field, the limiting surfaces of the reverberation room are at no point parallel to each other.
For the better diffusion of individual reflections reflectors are distributed throughout the reverberation room. From the perspective of music production the reverberation room has the disadvantage that the reverberation time and the sound of the reverberation can only be slightly manipulated by putting up absorbers. On the other hand, it has not been possible to create an equally high reflection density in real time with any other reverberation generator, yet. The acoustic counterpart to the reverberation room is the   anechoic chamber.

The reverberation room at the »SIM« was designed as a measuring room for researchers and for music productions in the first place. For that reason, it was designed as a spring stored house-in-house construction to avoid the transmission of airborne and structure-borne sound and to keep the basic noise level as low as possible. The basic level of NH 10 rises to 20 NH when operating the air-conditioning system. The reverberation room has a total space of 147 cubic metres - 47 cubic metres more than the permissible minimum volume but 53 cubic metres less than the recommended minimum volume. This might slightly affect any research activity. In order to create the desired diffuse sound field, the floor, the ceiling and the walls are all non-parallel. Furthermore, 12 cylinder-shaped reflectors are put up throughout the chamber; each is 1,25m in length and 1,25m in width and has a reflective surface. Cast-in channels in the ceiling and along the walls allow for a flexible mounting of reflectors, measuring devices or microphones. The whole chamber is painted with reverberant paint.