The reverberation time can be changed to a large extent by using electro-acoustical equipment. In a small theatre the reverberation time was raised from 0.75s to 1.2s, and in a concert hall from 1.5s to 3s. Exceeding these values with the help of a reverberation plate led, in the small theater, to distinct changes in the -coloring- of the sound. In the other test there was no coloring of the sound, but the reverberation time was felt to be too long. Using an artificial head with two built-in microphones the various ways in which the sound died away were recorded, and were evaluated via headphones in the laboratory. The radio transmission, which took place at the same time, was not affected as far as quality is concerned.
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