Loudspeaker

A coaxial loudspeaker comprising:

• a low frequency driver configured to generate low frequency sounds, the low frequency driver including
• a first voice coil,
• a first collar on which the first voice coil is mounted,
• a first diaphragm frusto-conically shaped and connected to the first collar such that motion of the first voice coil causes motion of the first diaphragm,
• a first surround configured to reduce radial motion of the first diaphragm, and
• a first spider configured to reduce radial motion of the first collar,
• a high frequency driver coaxially aligned with the low frequency driver and configured to generate high frequency sounds relative to the low frequency driver, the high frequency driver including
• a second voice coil,
• a second collar on which the second voice coil is mounted,
• a second diaphragm dome shaped and connected to the second collar such that motion of the second voice coil causes motion of the second diaphragm, and
• a second surround configured to reduce radial motion of the second diaphragm and the second voice coil;
• and
• a magnetic circuit shared by the low frequency driver and the high frequency driver, the magnetic circuit including
• a cup including a hollow cylindrical side wall and a circular bottom wall connected to one end of the side wall,
• a first magnet configured to generate a first magnetic field, the first magnet positioned within the cup in contact with the bottom wall,
• a second magnet configured to generate a second magnetic field, the second magnet positioned within the cup axially spaced apart from the first magnet,
• a pole piece positioned within the cup, the pole piece including a central ring and a lower flange connected to the central ring and extending radially outward, the central ring positioned radially inward from the second magnet,
• a plate having a ring shape and positioned within the cup in contact with the second magnet and radially outward from the central ring,
• a first magnetic gap in which the first voice coil is positioned, the first magnetic gap located between the lower flange and the side wall of the cup, and
• a second magnetic gap in which the second voice coil is positioned, the second magnetic gap located between the central ring and the plate.