The quality of reproduced music depends not only on the true reproduction of the complete spectrum and the absence of spurious sounds (noise and distortion products), but also on the distribution of the sound over the listening room. Stereophonic reproduction can simulate the directions of the direct sound and thus can imitate, for instance, an orchestra in a satisfactory manner. This is not sufficient, as the room acoustics of the concert hall are essential. The diffuse character of the reverberated sound cannot be reproduced by a single loudspeaker or group of loudspeakers, and only in a limited way by stereophony. It can, however, be reconstructed, even from a single channel, by feeding several loudspeakers distributed over the hall, with different and aleatory delays, repeated many times at decreasing levels.
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