Electrodynamic transducer with back cover for heat dissipation

An electrodynamic transducer, comprising:

• a motor assembly that provides a magnetic field across an air gap;
• a diaphragm disposed forward of the motor assembly, the diaphragm having a front surface and a rear surface;
• a voice coil operably connected to the diaphragm and supported in the air gap, wherein excitation of the voice coil causes movement of the diaphragm;
• and
• a back cover supporting the motor assembly and the diaphragm, the back cover having an internal surface and an external surface, the back cover creating an air cavity beneath the diaphragm rear surface, the back cover including a plurality of heat-conducting interior fins disposed on the internal surface and arranged to contact the motor assembly, the interior fins providing a heat transfer path from the motor assembly to the back cover, wherein the interior fins are arranged in concentric circles with an inner circle abutting an outer circle, wherein the fins of the inner circle have a first length and form a base of a motor support portion of the back cover, wherein the fins of the outer circle have a second length greater than the first length.

A loudspeaker system, comprising:

• an enclosure;
• a transducer mounted within the enclosure, the transducer including
• a motor assembly,
• a diaphragm disposed forward of the motor assembly, the diaphragm having a front surface and a rear surface, and
• a back cover supporting the motor assembly and the diaphragm, the back cover creating an air cavity beneath the diaphragm rear surface, the back cover including at least one heat-conducting member providing a heat transfer path from the motor assembly to the back cover;
• and
• a heat-conducting conduit mounted to an external surface of the back cover and spaced from the motor assembly, the heat-conducting conduit extending to a wall of the enclosure.