Acoustic scale models are useful not only in the design of concert halls but also in the design of sound control rooms. In a model it is possible to study in advance at relatively low cost the impulse responce, for examples, of the room and the influence of the shape of the room, certain surfaces, loudspeaker location etc, on the loudspeaker response in order to achieve good listening conditions in the final room. General principles of modelling are dealt with and some practical matters such as how to get the right kind of model absorbers and loudspeakers are discussed. Practical results of a 1/10 model of a music control room are given.
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