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A driver unit for a square planar diaphragm type loudspeaker system in which a voice coil bobbin attached to the square planar diaphragm is supported by a corrugated damper the other end of which is attached to a heat conducting support whereby heat generated within the voice coil of the speaker can be readily dissipated. A square magnetic circuit is provided including a plurality of straight magnetic circuit sections positioned along corresponding sides of the square planar diaphragms. Each of these straight magnetic circuit sections includes a pair of parallel plate members along inner walls of which opposite plurality magnets are disposed and with a yoke connecting the opposite ends of the plate members. The voice coil which is attached to the voice coil bobbin is disposed in the air gap between oppositely disposed magnets. The damper support is mounted on the outer plate member with a flange portion extending over the upper edge of the outer plate member and having an upper flange portion to the upper surface of which the damper is attached. The damper is formed of a corrugated section of treated cloth which has no elasticity in its longitudinal direction but which is free to move in a direction perpendicular to the plane of the diaphragm.

A voice coil bobbin construction for a planar diaphragm loudspeaker including plural bobbin frames joined together to form the composite voice coil bobbin. In one embodiment, the bobbin frames each have a coupling member at each end thereof which are bonded together in a planar contact. Reinforcing ribs may be provided extending parallel to the planar diaphragm. In another embodiment, a mounting flange intimately bonded to the planar diaphragm and a voice coil flange upon which the voice coil is mounted are provided. A damper fastening portion can also be formed by leaving a portion free of through-holes in the bobbin frames. The feeder wires to the voice coil can be run through the through-holes in the bobbin frames.

A coaxial multi-way planar diaphragm loudspeaker system having inner and outer frames rigidly coupled to each other. An inner peripheral edge portion of a planar diaphragm for the bass-range and an outer peripheral edge portion of a planar diaphragm for the mid-range are commonly supported by a common edge supporting member which is rigidly coupled to the front surface of the inner frame. A single backchamber is provided for the mid-range and higher-range speaker units to separate them from the rear chamber of the bass-range loudspeaker unit. The backchamber has an inclined surface portion extending toward the the rear-side of the bass-range loudspeaker unit. The driver units for the treble-ranges are attached to the frame through a mounting bracket having an oblong screw hole so that they can first be assembled then accurately positioned.