Today's studies about horns are actually based almost completely upon directivity control. In fact, while a good power response is finally recognized as important in professional loudspeaker systems engineering, the directivity behavior of horns represents certainly a useful tool to get it. The directional properties of these devices are governed by the wavefront's shape presented at the mouth. An analysis of the sound pressure's magnitude and phase distribution across the horn's mouth can certainly be helpful in understanding how the wavefront is shaped there. Moreover, this can help to understand what happens in some particular circumstances. For example, midrange beaming or high-frequency mouth diffraction phenomena are two well-known obstacles to overcome when designing a broadband constant directivity horn. A method to perform such an analysis is shown through graphic illustrations. This paper presents the results obtained performing measurements on real devices and the correlation to the polar plots.:
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