Loudspeaker magnet and earphone assembly

A loudspeaker driver assembly comprising:

• a magnet including an axially magnetized first dipole portion and an axially magnetized second dipole portion, wherein the first dipole portion is adjacent to the second dipole portion at a first boundary, and wherein the first and second dipole portions have opposed polarities at the first boundary;
• a first diaphragm assembly including a first voice coil and a first diaphragm;
• a first diaphragm support configured to locate the first voice coil from the first diaphragm assembly coaxially with the magnet and adjacent to a first surface of the magnet at the first boundary, wherein the first diaphragm support bounds a portion of a first airspace cavity behind the first diaphragm;
• a second diaphragm assembly including a second voice coil and a second diaphragm;
• and
• a second diaphragm support configured to locate the second voice coil from the second diaphragm assembly coaxially with the magnet and adjacent to a second surface of the magnet at the first boundary, wherein the second surface of the magnet is opposite to the first surface of the magnet, and wherein the second diaphragm support bounds a portion of a second airspace cavity behind the second diaphragm;
• wherein at least one of the first and second diaphragm supports includes a vent that couples a respective one of the first and second airspace cavities with a third airspace adjacent to the loudspeaker driver assembly.

A headphone assembly with left and right loudspeaker drivers provided in respective left and right ear cups, wherein each ear cup comprises an ear-facing acoustic chamber that abuts an ear when the headphone assembly is worn by a listener and a low frequency acoustic chamber, wherein each of the left and right loudspeaker drivers comprises:

• a magnet including an axially magnetized first dipole portion and an axially magnetized second dipole portion, wherein the first dipole portion is adjacent to the second dipole portion at a first boundary, and wherein the first and second dipole portions have opposed polarities at the first boundary;
• a first diaphragm assembly including a first voice coil and a first diaphragm;
• a first diaphragm support configured to locate the first voice coil from the first diaphragm assembly coaxially with the magnet and adjacent to a first surface of the magnet at the first boundary, wherein the first diaphragm support bounds a portion of a first airspace cavity behind the first diaphragm and bounds a portion of the ear-facing acoustic chamber on an opposite side of the first diaphragm;
• a second diaphragm assembly including a second voice coil and a second diaphragm;
• a second diaphragm support configured to locate the second voice coil from the second diaphragm assembly coaxially with the magnet and adjacent to a second surface of the magnet at the first boundary, wherein the second surface of the magnet is opposite to the first surface of the magnet, and wherein the second diaphragm support bounds a portion of a second airspace cavity behind the second diaphragm and bounds a portion of the low frequency acoustic chamber on an opposite side of the second diaphragm;
• and
• a first port configured to couple the ear-facing acoustic chamber with the low frequency acoustic chamber.