A loudspeaker enclosure including: - a box at least partially spherical and including a spherical zone , - a plurality of loudspeakers having convex mobile membranes , the convex side being turned toward the outside of the enclosure , the loudspeakers being substantially identical and installed in a wall of the box, and - the box surrounding each mobile membrane and including an outer surface bounded by an inner edge (Γ') situated facing each mobile membrane , each mobile membrane including a peripheral edge (Γ) situated opposite the inner edge (Γ) of the box and forming a closed loop, - over a continuous portion (Γ") of the peripheral edge (Γ) representing at least 25%, preferably at least 50%, still more preferably at least 90%, of the length of the peripheral edge (Γ), for any first point (M) of the continuous portion (Γ") and any second point (M') situated on the inner edge (Γ') at a location such that the distance between the first point (M) and the second point (M') is minimal, each membrane has, at the first point (M), a first tangent plane (P M ), and the outer surface of the box has, at the second point (M'), a second tangent plane (P' M ), the first tangent plane (P M ) and the second tangent plane (P' M ) being substantially coincident with one another, - the mobile membranes are in the form of a solid spherical cap with the same curvature as the curvature of the spherical zone of the box , the mobile membranes substantially extending the spherical zone of the box to form, in the idle position of the mobile membranes , a substantially continuous spherical surface, and - the loudspeakers have stationary parts secured together rigidly, the loudspeakers being distributed angularly around a distribution axis (Z-Z) so as to successively form angles (γ) between them substantially equal to 360° divided by N, N being the number of loudspeakers . - a box at least partially spherical and including a spherical zone , - a plurality of loudspeakers having convex mobile membranes , the convex side being turned toward the outside of the enclosure , the loudspeakers being substantially identical and installed in a wall of the box, and - the box surrounding each mobile membrane and including an outer surface bounded by an inner edge (Γ') situated facing each mobile membrane , each mobile membrane including a peripheral edge (Γ) situated opposite the inner edge (Γ) of the box and forming a closed loop, - over a continuous portion (Γ") of the peripheral edge (Γ) representing at least 25%, preferably at least 50%, still more preferably at least 90%, of the length of the peripheral edge (Γ), for any first point (M) of the continuous portion (Γ") and any second point (M') situated on the inner edge (Γ') at a location such that the distance between the first point (M) and the second point (M') is minimal, each membrane has, at the first point (M), a first tangent plane (P M ), and the outer surface of the box has, at the second point (M'), a second tangent plane (P' M ), the first tangent plane (P M ) and the second tangent plane (P' M ) being substantially coincident with one another, - the mobile membranes are in the form of a solid spherical cap with the same curvature as the curvature of the spherical zone of the box , the mobile membranes substantially extending the spherical zone of the box to form, in the idle position of the mobile membranes , a substantially continuous spherical surface, and - the loudspeakers have stationary parts secured together rigidly, the loudspeakers being distributed angularly around a distribution axis (Z-Z) so as to successively form angles (γ) between them substantially equal to 360° divided by N, N being the number of loudspeakers . <EOS>