Abstract
This paper presents a study for the optimum design and construction of an omnidirectional point source. The point source model of theoretical acoustics is used as an elementary unit for electroacoustic measurements in the area of room and free-field acoustics. The spherical radiation requirement for the entire acoustic spectrum and the finite dimensions of the point source model contradict the construction in practice. This is because of high-frequency beaming and the existing dimensions of radiators. A new design approach of using horn loaded cone loudspeakers and properly placed high-frequency diffusers was used to minimize these problems. Twelve radiators loaded on pentagon-shaped horns were placed in a dodecahedron topology to build a practical point source with a useful frequency response of 80–16<th>000 Hz and an omnidirectional radiation pattern up to 12<th>000 Hz. The results display improvement in the radiation pattern compared to those of the already existing point sources, due to the use of horns and diffusers. Increase in the sound pressure level is also displayed because of the obvious increase of the directivity index of each individual radiating element.
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