A loudspeaker includes an enclosure including a resonance chamber and an acoustic emission aperture for communication of the resonance chamber with the outside, and a plurality of speaker units including a first speaker unit arranged in a first direction and a second speaker unit arranged in a second direction, and the plurality of speakers being accommodated in the enclosure in a non-coaxial arrangement. Front slit spaces of the plurality of speaker units are in communication with the resonance chamber.

An in-ear device incorporating active noise reduction has a housing adapted for location in or adjacent to an auditory canal. The housing contains a driver and an acoustic path is provided from the driver to an outlet of the device. A microphone and an acoustic impedance are provided in the acoustic path. The impedance increases the stability of the device.

An acoustic device that has a neck loop that is constructed and arranged to be worn around the neck. The neck loop includes a housing with a first acoustic waveguide having a first sound outlet opening, and a second acoustic waveguide having a second sound outlet opening. There is a first open-backed acoustic driver acoustically coupled to the first waveguide and a second open-backed acoustic driver acoustically coupled to the second waveguide.

The present invention relates to a microphone assembly comprising a microphone unit for converting incoming acoustical sound to an electrical signal, and a rear volume comprising acoustically connected rear volume compartments, said acoustically connected rear volume compartments setting an effective acoustical impedance of said rear volume in order to reduce the sensitivity of the microphone assembly with respect to a resonance peak. The present invention further relates to a hearing device comprising a microphone assembly.

A loudspeaker includes an enclosure including a resonance chamber and an acoustic emission aperture for communication of the resonance chamber with the outside, and a plurality of speaker units including a first speaker unit arranged in a first direction and a second speaker unit arranged in a second direction, and the plurality of speakers being accommodated in the enclosure in a non-coaxial arrangement. Front slit spaces of the plurality of speaker units are in communication with the resonance chamber.

An acoustic device that has a neck loop that is constructed and arranged to be worn around the neck. The neck loop includes a housing with a first acoustic waveguide having a first sound outlet opening, and a second acoustic waveguide having a second sound outlet opening. There is a first open-backed acoustic driver acoustically coupled to the first waveguide and a second open-backed acoustic driver acoustically coupled to the second waveguide.

This application provides an electronic device, and relates to the field of electronic technologies. The electronic device includes a housing, a circuit board, a sealing hood, and a microphone. A first through hole is disposed on the housing. The circuit board includes a first surface and a second surface. A second through hole and a third through hole are disposed on the circuit board, and the second through hole is opposite to and communicated with the first opening. The sealing hood is located on a side that the second surface faces, the sealing hood and the circuit board enclose an air flow cavity, and the air flow cavity is communicated with the second through hole and the third through hole. The microphone is located on a side that the first surface faces, the microphone has a sound pickup hole that is opposite to and communicated with the third through hole.