Speaker having dual-coil, dual-gap, electromagnetic transducer with enhanced saturated pole tips

A speaker comprising:

• a magnetic assembly including an annular central portion and an annular sleeve portion, the sleeve portion concentrically surrounding the central portion with an air gap spacing therebetween, the central portion including a first pole piece having a first pole tip, the sleeve portion including a second pole piece having a second pole tip, the pole tips being opposed across a first air gap that is a first part of the air gap spacing, each pole piece other than the pole tip of the pole piece has a flat profile and the pole tip of the pole piece has a triangular shape including a first tip portion that extends along the first air gap in a first direction from the pole tip and a second tip portion that extends along the first air gap in an opposite second direction from the pole tip;
• a voice coil assembly including a bobbin having a first voice coil arranged thereon, the bobbin being movable relative to the magnetic assembly with the voice coil being positioned at least partially within the first air gap;
• and
• a diaphragm coupled to the bobbin to move as the bobbin moves.

A dual-coil, dual-gap, electromagnetic transducer for a speaker, comprising:

• a magnetic assembly including an annular central portion and an annular sleeve portion, the sleeve portion concentrically surrounding the central portion with an air gap spacing therebetween, the central portion and the sleeve portion having a common center axis extending in an axial direction;
• the central portion including a first top pole piece, a first top permanent magnet, a first central pole piece, a first bottom permanent magnet, and a first bottom pole piece that are stacked on one another in the recited order along the axial direction;
• the sleeve portion including a second top pole piece, a second top permanent magnet, a second central pole piece, a second bottom permanent magnet, and a second bottom pole piece that are stacked on one another in the recited order along the axial direction;
• each pole piece having a pole tip, the pole tips of the top pole pieces being opposed across a top air gap that is a first part of the air gap spacing;
• the pole tips of the bottom pole pieces being opposed across a bottom air gap that is a second part of the air gap spacing;
• and
• a voice coil assembly including a bobbin having a first voice coil and a second voice coil arranged thereon, the bobbin being movable relative to the magnetic assembly with the first voice coil being positioned at least partially within the top air gap and the second voice coil being positioned at least partially within the bottom air gap.