A computer program for cluster design will be presented. It avoids distortions caused by spherical mapping and it is based on the concept of surrounding a loudspeaker with an isobar surface intersecting the listening planes. The intersection curves will be displayed in 3D. Direct, diffuse, and total sound pressure levels will be calculated as well as the ALC, STI, and permitted background noise levels. A scaled drawing on a plotter and an unscaled printout on a dot matrix printer will be presented. The program includes an open loudspeaker database.
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