Introductorily premises are listed up for optimum sound technology and sound quality in large multipurpose halls. Essential dates are given on a new large multipurpose hall in the GDR, with a short information of the different main sound systems. A new sound system (DELTA-STEREOPHONY-SYSTEM) is described which works so that coincidence of optical and acoustical directional impressions can be assured and which overcomes the shortcomings of other methods (as intensity stereophony etc.).
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