An omnidirectional loudspeaker based on a ring-radiator

Several (standardized) measurements require an omnidirectional sound source. Traditionally used sources offer either high power and flat frequency response, but limited omnidirectionality, or excellent point source characteristics with very irregular frequency response and limited power. In this paper, the development and performance of a different kind of source, consisting of two broadband speakers in face-to-face configuration, each with smooth conical enclosure, are presented. The proposed source, radiating the sound from a ring-like area, has a useable frequency range of 150 Hz–10 kHz, with 106 dB sound power and good uniformity of pressure with angle. Data from two commercial sources is presented for comparison.