Abstract: A horn driver includes a driver body and pole piece positioned therein. A throat extends through the pole piece along a longitudinal axis through the horn driver. A housing, attached to the driver body, is positioned above an upper portion of the pole piece and spaced therefrom to define a diaphragm chamber. A disk-shaped diaphragm in the diaphragm chamber is above and spaced from the pole piece and below and spaced from the housing. The diaphragm is attached to the housing solely at a central support area. The diaphragm has a ring-like and vibratable diaphragm portion extending radially outward from the central support area to an outer peripheral edge and a voice coil connected to a cylindrical voice coil support along the diaphragm's outer peripheral edge. The diaphragm portion includes an inner diaphragm segment extending upwardly and outwardly from the central support area to a peak point and an outer diaphragm segment extending downwardly and outwardly from the peak point to the outer peripheral edge.