Shorting rings in dual-coil dual-gap loudspeaker drivers

A loudspeaker drive motor, comprising,

• a first pole piece;
• a second pole piece;
• a magnet in between the first and second pole pieces;
• a yoke;
• a first magnetic gap formed between the first pole piece and the yoke;
• a second magnetic gap formed between the second pole piece and the yoke;
• a gap extending between the first and second magnetic gaps, wherein the first and second magnetic gaps are adapted to receive dual-voice coils,
• a magnetic flux loop formed through the magnet, the first pole piece, the first magnetic gap, the yoke, the second magnetic gap, and the second pole piece;
• a first shorting ring fixedly adjacent to one of the first and second magnetic gaps to oppose changes in intensity or location of the magnetic flux from the magnet, thereby reducing distortion, where the first shorting ring is positioned proximate the yoke and at least entirely within the magnetic flux loop or at least entirely outside of the magnetic flux loop.

A loudspeaker driver, comprising:

• a yoke;
• a magnet comprising a first pole and a second pole, where the first pole is positioned relative to the yoke to define a first gap and the second pole is positioned relative to the yoke to define a second gap;
• a first coil positioned in the first gap;
• a second coil positioned in the second gap, where the first coil and the second coil are configured to set up a magnetic flux loop, the magnetic flux loop defines a center line, and the center line separates a magnetic flux loop interior from a magnetic flux loop exterior;
• and
• a shorting ring positioned proximate the first gap and the second gap and within one of the magnetic flux loop interior and the magnetic flux loop exterior.

A loudspeaker driver, comprising:

• a yoke;
• a magnet comprising a first pole and a second pole, where the first pole is positioned relative to the yoke to define a first gap and the second pole is positioned relative to the yoke to define a second gap;
• a first coil positioned in the first gap;
• a second coil positioned in the second gap, where the first coil and the second coil are configured to set up a magnetic flux loop, the magnetic flux loop defines a center line, and the center line separates a magnetic flux loop interior from a magnetic flux loop exterior;
• and
• a shorting ring having a first edge and a second edge, where the shorting ring defines a ring center line between the first edge and the second edge, and the shorting ring is positioned proximate the first coil and the second coil so that the center line of the magnetic flux loop passes approximately through the ring center line.

A loudspeaker driver, comprising:

• a yoke;
• a magnet comprising a first pole and a second pole, where the first pole is positioned relative to the yoke to define a first gap and the second pole is positioned relative to the yoke to define a second gap;
• a first coil positioned in the first gap;
• a second coil positioned in the second gap, where the first coil and the second coil are configured to set up a magnetic flux loop, the magnetic flux loop defines a center line, and the center line separates a magnetic flux loop interior from a magnetic flux loop exterior;
• and
• a shorting ring embedded in one of the magnet so as to span between the first pole and the second pole and a recess of the yoke so as to span between the first gap and the second gap.