There are especially two parameters of eidophonic transmission with great influence on quality of reproduction. The shape of the patterns of the two rotating microphones is found to be important for the impression of a sound source far away. The number of the speakers should be smaller than 2 x 6. This experience is confirmed by charts of constant phase. Such charts can be made easily with the aid of a computer. Each configuration of loudspeakers can be set up if one tries to get a good quality with less expenditure.
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