The basic conception of loudspeakers remains unchanged for decades. In particular, the shape of the diaphragm is nowadays designed as the association of a spherical cap and a truncated cap. The present work focuses on the influence of the shape of the diaphragm on the sound radiation. A temporal model based on spatial impulse response has been developed to predict the sound radiation of an axisymetric source subjected to an impulse. It is shown that non-planar sources are less subject to off-axis amplitude and phase variations than planar sources. The comparison between convex and concave geometries is also studied. It is shown that transients are more accurately reproduced by convex structures.
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