Development of two miniature loudspeaker for acoustic scale model

An ideal acoustic source for acoustic scale model test needs to meet the following conditions:small size, omnidirectional radiation, relatively flat high-frequency response, adequate signal-to-noise ratio for test, and stably sending controlled signals. In this paper, two miniature omnidirectional acoustic sources (Conduit Point Acoustic Source and Hexahedral Source) with a size of less than 15mm are developed, and their directivities and high frequency responses are tested in a semi-anechoic room respectively. The test results show that with a scale of 1:10, the signal-to-noise ratio of the two miniature omnidirectional acoustic sources can reach more than 35dB, and their directivities all meet the requirement of omnidirectional radiation according to the "JJF 1468-2014 omnidirectional acoustic source calibration specification". The high frequency response of the Conduit Point Acoustic Source is more flat, but the Hexahedral Source has a greater signal to noise ratio at rated power. Both acoustic sources can be used for acoustic scale model experiments.