An experimental pentaphonic-five loudspeaker-reproduction system is described. Correlation measurements were carried out, between ear-signals as received from a dummy head, to determine the homogeneity of the reproduced sound field. Specially recorded program material was used for subjective evaluation of directional properties and diffuseness in the listening area. The influence of interchannel crosstalk was investigated when using a three-channel matrix. The investigation, undertaken to contribute to development of surround sound systems, reveals that more accurate reproduction of orchestral music can be achieved compared to common quadrophonic (four loudspeaker) arrangements. A well spread frontal sound picture, up to 110°, and stable sound images are produced.
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