Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers can be used at all audio frequencies, including subwoofer frequencies. The magnetic negative springs of the electroacoustic drivers can cancel, or partially cancel, the large pressure forces on a sound panel (of an audio speaker) so that substantial subwoofer notes can be efficiently and cost effectively produced in small/portable speakers. The electroacoustic drivers can include a stabilizing/centering mechanism to overcome the destabilizing forces of a MNS that are too large for a voice coil alone to produce.

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers can be used at all audio frequencies, including subwoofer frequencies. The magnetic negative springs of the electroacoustic drivers can cancel, or partially cancel, the large pressure forces on a sound panel (of an audio speaker) so that substantial subwoofer notes can be efficiently and cost effectively produced in small/portable speakers. The electroacoustic drivers can include a stabilizing/centering mechanism to overcome the destabilizing forces of a MNS that are too large for a voice coil alone to produce.

An apparatus includes a vibration member, a housing at a rear surface of the vibration member, a connection member between the vibration member and the housing, and a vibration apparatus configured to vibrate the vibration member, the vibration member includes at least one flat portion and at least one flexural portion adjacent to the at least one flat portion.

A balanced armature receiver includes a gas permeable barrier located on a portion of the receiver defining a back volume to provide barometric relief. The barrier can be located in a wall portion or diaphragm of the receiver to vent the back volume to an exterior of the receiver directly, via a front volume, or via a nozzle. The gas permeable barrier is impermeable to liquid infiltration and can be configured to influence the low frequency response of the receiver.

A balanced armature receiver includes a gas permeable barrier located on a portion of the receiver defining a back volume to provide barometric relief. The barrier can be located in a wall portion or diaphragm of the receiver to vent the back volume to an exterior of the receiver directly, via a front volume, or via a nozzle. The gas permeable barrier is impermeable to liquid infiltration and can be configured to influence the low frequency response of the receiver.

A diaphragm for a balanced armature receiver and combinations thereof. The diaphragm includes a paddle having an area of concentrated mass located at or near a central portion of the paddle, the area of concentrated mass having an area density greater than an area density of other portions of the paddle, wherein the area of concentrated mass shifts a bending-mode frequency of the paddle to a lower frequency compared to a bending-mode frequency of the paddle in the absence of the area of concentrated mass.

Provided is a balanced armature type speaker. The balanced armature type speaker includes a housing, a driving assembly and a diaphragm. The housing includes an upper inner cavity and a lower inner cavity, the lower inner cavity and the upper inner cavity are through from top to bottom, the driving assembly is located in the lower inner cavity, and the driving assembly includes a magnet, a coil, an armature and an ejector pin. The armature is inserted into the magnet and the coil sequentially, the ejector pin is fixedly connected to the armature and the diaphragm, and the diaphragm is located in the upper inner cavity. The housing is shaped to be wide at the upper part and narrow at the lower part, and in the horizontal direction, a width of the upper inner cavity is larger than a width of the lower inner cavity.

Provided is a balanced armature type speaker. The balanced armature type speaker includes a housing, a driving assembly and a diaphragm. The housing includes an upper inner cavity and a lower inner cavity, the lower inner cavity and the upper inner cavity are through from top to bottom, the driving assembly is located in the lower inner cavity, and the driving assembly includes a magnet, a coil, an armature and an ejector pin. The armature is inserted into the magnet and the coil sequentially, the ejector pin is fixedly connected to the armature and the diaphragm, and the diaphragm is located in the upper inner cavity. The housing is shaped to be wide at the upper part and narrow at the lower part, and in the horizontal direction, a width of the upper inner cavity is larger than a width of the lower inner cavity.

The present disclosure relates to a bone conduction speaker and its compound vibration device. The compound vibration device comprises a vibration conductive plate and a vibration board, the vibration conductive plate is set to be the first torus, where at least two first rods inside it converge to its center; the vibration board is set as the second torus, where at least two second rods inside it converge to its center. The vibration conductive plate is fixed with the vibration board; the first torus is fixed on a magnetic system, and the second torus comprises a fixed voice coil, which is driven by the magnetic system. The bone conduction speaker in the present disclosure and its compound vibration device adopt the fixed vibration conductive plate and vibration board, making the technique simpler with a lower cost; because the two adjustable parts in the compound vibration device can adjust both low frequency and high frequency area, the frequency response obtained is flatter and the sound is broader.

The present disclosure relates to an apparatus. The apparatus may comprise two ear-hook assemblies configured to be hung outside of two ears of a user respectively, and a rear-hook assembly in a curved shape configured to connect the two ear-hook assemblies and wrap around a rear side of the head of the user. The rear-hook assembly may include an elastic metal filament, wires, and an elastic covering body covering the elastic metal filament and the wires.