A speaker box includes a housing having a receiving space; a sound generator having a diaphragm received in the receiving space for vibrating along a vibration direction; a sound aperture formed in the housing for s communicating the sound generator with an outside of the speaker box; a dustproof member positioned by the housing and covering completely the sound aperture. The dustproof member includes a first dustproof element fixed to the housing and completely covering the sound aperture; a second dustproof element fixed to the housing; a gasket plate sandwiched between the first and second dustproof elements. The gasket forms a through hole aligned with the sound aperture and completely covered by the second dustproof element.

A playback device comprises an acoustic waveguide having a bounding surface, the bounding surface delimiting an opening. A drainage channel extends from the opening and is arranged to direct liquid from inside the waveguide toward a drainage outlet.

A playback device comprises an acoustic waveguide having a bounding surface, the bounding surface delimiting an opening. A drainage channel extends from the opening and is arranged to direct liquid from inside the waveguide toward a drainage outlet.

A wearable speaker includes: a pair of speaker boxes that are attached on both ends of an attached band; and a speaker unit and a passive radiator that are attached on each of the speaker boxes.

Phase plugs (70) and related audio devices (100, 105) and methods comprise various compression members (2), and guides (120) extending from the compression members (2) to tips (84), are configured such that central axes (93, 99) defined perpendicular to compression members (2) and/or diaphragms (94) are asymmetric and/or non-axisymmetric to the central axes (93, 99).

Phase plugs (70) and related audio devices (100, 105) and methods comprise various compression members (2), and guides (120) extending from the compression members (2) to tips (84), are configured such that central axes (93, 99) defined perpendicular to compression members (2) and/or diaphragms (94) are asymmetric and/or non-axisymmetric to the central axes (93, 99).

A playback device comprises an electroacoustic transducer; an acoustic waveguide in fluid communication with the transducer; and a housing delimiting an opening of the waveguide, the opening extending around an axis passing through the transducer. The opening may have a radial distance from the axis that varies with an azimuthal angle about the axis. An acoustic path length within the waveguide, between the transducer and the opening, is substantially constant and independent of azimuthal angle about the axis.

A playback device comprises an electroacoustic transducer; an acoustic waveguide in fluid communication with the transducer; and a housing delimiting an opening of the waveguide, the opening extending around an axis passing through the transducer. The opening may have a radial distance from the axis that varies with an azimuthal angle about the axis. An acoustic path length within the waveguide, between the transducer and the opening, is substantially constant and independent of azimuthal angle about the axis.

A playback device comprises an electroacoustic transducer; an acoustic waveguide in fluid communication with the transducer; and a housing delimiting an opening of the waveguide, the opening extending around an axis passing through the transducer. The opening may have a radial distance from the axis that varies with an azimuthal angle about the axis. An acoustic path length within the waveguide, between the transducer and the opening, is substantially constant and independent of azimuthal angle about the axis.

A playback device comprises an electroacoustic transducer; an acoustic waveguide in fluid communication with the transducer; and a housing delimiting an opening of the waveguide, the opening extending around an axis passing through the transducer. The opening may have a radial distance from the axis that varies with an azimuthal angle about the axis. An acoustic path length within the waveguide, between the transducer and the opening, is substantially constant and independent of azimuthal angle about the axis.