An illustrative hearing device may be at least partially inserted into an ear canal and may include an acoustic transducer having a membrane configured to generate sound waves, a housing enclosing a first chamber and a second chamber acoustically coupled by the membrane, a sound outlet configured to release sound waves from the first chamber into the ear canal, an acoustic port acoustically coupling the second chamber to an ambient environment outside the ear canal, and a mechanical resonator configured to resonate with sound waves at a resonance frequency. The second chamber may be acoustically coupled to the mechanical resonator.

A speaker apparatus includes a pair of left and right speaker blocks that respectively have acoustic output sections and that are arranged inside a backrest. The pair of speaker blocks are arranged horizontally side by side relative to a headrest located on a front surface side of the backrest, and at least part of the headrest is located within a range of a nominal directivity angle of acoustics output from the acoustic output sections. This ensures that, of the acoustics output from the acoustic output section of the speaker block on the left side, at least some acoustics that head for the right ear are blocked by the headrest and that, of the acoustics output from the acoustic output section of the speaker block on the right side, at least some acoustics that head for the left ear are blocked by the headrest.

Disclosed is an open headphone, comprising a front cover, a loudspeaker unit and a rear housing. A front headphone chamber is formed between the front cover and the loudspeaker unit. A rear headphone chamber is formed between the loudspeaker unit and the rear housing. The front cover is provided with several sound output holes. The loudspeaker unit has a middle loudspeaker hole which is through in a front-rear direction. The rear housing is also provided with a sound guide tube. The rear end of the sound guide tube is in communication with the external space of the headphone. The front end of the sound guide tube is inserted in the middle loudspeaker hole and at a distance from a vibrating diaphragm, and the distance is larger than a maximum vibration displacement of the vibrating diaphragm. The open headphone of the present disclosure has high-quality bass performance, and other advantages, such as that the sound field is open and natural, that the user is not easy to become fatigue after long-term use, and that it will not cause damage to people's hearing. By inserting the front end of the sound guide tube in the middle loudspeaker hole, which is able to reduce the volume of the rear headphone chamber, so as to make the whole headphone small and easy to carry.

A vehicle and a method of controlling the same maintain a constant resonant frequency of an enclosure even when the external and internal temperature of the vehicle changes by changing the length or cross-sectional area of a port of an enclosure provided in the vehicle. The vehicle includes a first sensor that measures an external temperature of the vehicle, a housing, and a speaker that is provided inside the housing and arranged to face an opening formed at one surface of the housing. A pipe is provided in the housing and arranged to have an opening thereof face a hole formed at the one surface of the housing. A driving part changes a volume of the pipe and a controller operates the driving part to change the volume of the pipe based on the external temperature of the vehicle.

An electronic device can include a housing defining an aperture and a display positioned in the aperture. The display and the housing can define an internal volume in which a speaker assembly is positioned. The speaker assembly can include a speaker module and a speaker enclosure in fluid communication, with the speaker enclosure at least partially defining a speaker volume.

An acoustic variable porting system includes an acoustic element and an acoustic variable porting element forming a port into the acoustic element. The acoustic variable porting element is adjustable between at least an open position, in which the port is generally open, and a closed position, in which the port is generally closed. The acoustic element may be at least one of: a sub-kick, a ported drum, and a speaker.

Provided in the present invention is a stereo sound box, including: a box body. Two sets of sound generating units are provided on a surface of the box body, correspondingly for a left sound channel and a right sound channel. Each set of sound generating units includes a low sound unit and at least one high sound unit. The low sound units of the two sets of sound generating units are arranged to mirror each other so as to neutralize the inertia of vibrations. The high sound units are arranged outside each low sound unit. In the described stereo sound box, high-fidelity low sound can be maintained even while the box body is kept light.

The electronic device may include: a housing; a printed circuit board (PCB) disposed in the housing, the PCB including a first board surface facing a first direction and a second board surface opposite to the first board surface, and having an opening penetrating through a surface thereof, a sound module disposed in the opening so that a front thereof faces the first direction, and electrically connected to the PCB to generate a sound, a shield can connected to the second board surface to cover the opening, in a state in which the second board surface is viewed, and a frame disposed to face the first board surface.

An acoustic enclosure includes a housing at least partially defining an acoustic chamber for an acoustic radiator. The housing further defines an acoustic opening from the acoustic chamber to a surrounding environment. The acoustic enclosure also has a first acoustic resonator and a second acoustic resonator. The first acoustic resonator and the second acoustic resonator are acoustically coupled with the acoustic chamber in parallel relative to each other. Each of the first acoustic resonator and the second acoustic resonator modifies a frequency response of the acoustic chamber. Loudspeakers can include such an enclosure acoustically excited or driven by an electro-acoustic transducer. As well, an electronic device can include such a loudspeaker.

A speaker unit is provided. The speaker unit may include a frame; a yoke elongated on the frame along a front-to-rear direction; a first magnet disposed on one side of the yoke; a first plate disposed on one side of the first magnet; a first diaphragm disposed on one side of the first plate; a first coil fixed to the first diaphragm; a second magnet disposed on the other side of the yoke; a second plate disposed on the other side of the second magnet; a second diaphragm disposed on the other side of the second plate; a substrate disposed on the frame; a microphone electrically connected to the substrate; and a second coil fixed to the second diaphragm, wherein the first magnet and the second magnet are both in contact with the yoke, the frame includes a seating portion, and the microphone is disposed in the seating portion.