Abstract
The significance of early lateral reflections with regard to subjective acoustical quality (especially ‘spaciousness’) in concert halls has been discussed in several papers over the last four years. In this paper some criteria for the lateral sound energy described in these publications are compared with each other, then a simple measuring system is presented for evaluating the fraction of lateral reflections in real rooms as well as in 1:50 scaled models. On the basis of some experimental results, the influence of room shape on the lateral sound in ratio is discussed. The distribution of side-wall reflections turns out to be most well-balanced in rectangular rooms. In contrast there are areas of deficient lateral sound energy in all the halls examined which have trapezoidal or other non-rectangular shapes.
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