Patent ID: 7218749

Claim:
A pillar loudspeaker intended for sound reproduction indoors and outdoors, which pillar loudspeaker includes an essentially closed chamber with a passage to free space to allow air to pass from the chamber to the free space, a cabinet construction supporting a diaphragm at one side of the chamber, at least one operating device for driving the diaphragm, which is operationally a straight, unified, and relatively stiff single component, which is tall vertically and narrow horizontally in such a way that the height H of said diaphragm is at least three times greater than its width W, and in which the diaphragm is arranged to vibrate mechanically by means of the force of said operating device to produce a sound in the free space, the cabinet construction being arranged to prevent acoustic feedback by enclosing one side of said diaphragm within it, the other side having an air connection to the free space, and a facade board that includes one elongated, narrow, non-circular opening opposing the diaphragm in the chamber, the opening being high vertically and narrow horizontally.