Horn provided with a pressure tube, a membrane and a tubular flag, the tube and the roof being connected to the membrane. The horn is characterized in that the membrane is stretched over the front face of the pressure tube, in that the flag is placed inside the coaxially pressure tube therewith, its front face being pressed against the central portion of the membrane, and in that an annular space is provided between the outer surface of the horn and the inner surface of the pressure tube, said gap being closed at the end opposite to that of the membrane, and a hole being formed in the wall of the pressure tube to permit the passage of sound.
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