The present invention relates to a sound diffusion device (300) comprising a single box (310) and, in this single box (310), at least two superimposed high frequency acoustic sources (320), and several medium frequency sources and / or low frequency (330) superimposed and arranged to the left and / or right of the high frequency acoustic sources (320), the high frequency acoustic sources (320) being individually coupled to a waveguide (340) so as to generate a vertical wavefront with fixed non-constant curvature. Such a device (300) makes it possible to minimize the discontinuities between the acoustic sources offering a high quality of sound diffusion (no parasitic lobe), to considerably reduce the weight and the manufacturing cost and also a rapid installation not requiring the angular adjustment. of each of the acoustic sources one against the other unlike current devices.
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