Abstract: The present invention discloses a loudspeaker driver comprising a magnet system having at least one gap where in each gap a voice coil assembly is arranged for movement in the gap, wherein either two distinct coils are arranged on the voice coil assembly, one above the other, and the magnet system comprises two pole pieces, one above the other, creating a pair of magnetized areas between said pole pieces and a yoke, such that a magnetic flux field is created between each pole piece and the yoke.

Abstract: An electromagnetic drive unit for a loudspeaker of the type where an air gap is arranged in a magnet system such that magnetic flux lines are substantially linear across the air gap, and that a voice coil is arranged in said air gap, wherein the magnet system comprises a central yoke separated by said air gap from a ring-shaped magnet system, which magnet system at least comprises a bottom plate connected to said central yoke, and a magnet and a top plate, characterized in that at least a section of the central yoke corresponding to the extent of the air gap and at least a corresponding section of the top plate is made from a soft magnetic composite material.

Abstract: An electromagnetic drive unit for a loudspeaker of the type where an air gap is arranged in a magnet system such that magnetic flux lines are substantially linear across the air gap, and that a voice coil is arranged in said air gap, wherein the magnet system comprises a central yoke separated by said air gap from a ring-shaped magnet system, which magnet system at least comprises a bottom plate connected to said central yoke, and a magnet and a top plate, characterised in that at least a section of the central yoke corresponding to the extent of the air gap and at least a corresponding section of the top plate is made from a soft magnetic composite material.