Patent ID: 7302076

Claim:
A speaker comprising a magnet structure comprising at least two permanent magnets, a pole assembly including at least one pole-forming element, and a shunt member disposed between said magnets, said shunt being connected between said permanent magnets and angling around to concentrate flux of said permanent magnets between pole faces forming a first flux gap positioned at a back end of said magnet structure, a first voice coil residing in the first flux gap, and a main diaphragm connected to the first voice coil such that a drive current applied to the first voice coil moves the diaphragm to generate sound, the main diaphragm being connected to the voice coil at a back portion and extending forward of the back portion, wherein the first voice coil and magnet structure are centered on the main diaphragm in a location ahead of said back portion, thereby forming a speaker of reduced depth.