A compression driver for an omnidirectional loudspeaker includes a motor assembly and a dome diaphragm disposed coaxially above and operably connected to the motor assembly, the diaphragm having a convex surface and a concave surface. The compression driver includes a phasing plug having a top portion and a bottom portion having a concave bottom surface disposed adjacent the convex surface of the diaphragm and defining a compression chamber therebetween. The phasing plug includes a plurality of conduits extending through the bottom portion for sound waves to travel and converging to form an annular exit, the top portion including a plurality of radially expanding channels acoustically connected to the annular exit. Actuation of the diaphragm by the motor assembly generates sound waves within the compression chamber which travel through the annular exit and the radially-expanding channels to create a generally horizontal 360° radiation pattern of the sound waves from the compression driver.

A voice-controlled electronic device that includes an axisymmetric device housing having a longitudinal axis bisecting opposing top and bottom surfaces and a side surface extending between the top and bottom surfaces. The device can further include a plurality of microphones disposed within the device housing and distributed radially around the longitudinal axis; a processor configured to execute computer instructions stored in a computer-readable memory for interacting with a user and processing voice commands received by the plurality of microphones and first and second transducers configured to generate sound waves within different frequency ranges.

A phase plug for a loudspeaker having a driven diaphragm, wherein at least a portion of the surface of the phase plug disposed in use adjacent the diaphragm is generally annular in two orthogonal directions and has an axis in a third orthogonal direction, and wherein at least a portion of the said annular surface is shaped such that as successive radial cross-sections through the annular surface are generated by rotating a plane about the axis, the cross-sectional shape of the surface of the phase plug varies periodically as the angle of rotation increases.

In one embodiment of the present invention, a manifold composites sound from multiple drivers into a single aperture that includes multiple concentric rings. In operation, channels within the manifold isolate the sound generated by each driver from the sound generated by the other drivers. The channels within the manifold are intertwined to route the sound from each driver to a separate location in one of the multiple concentric rings. When the sound generated by each of the drivers is judiciously and deterministically delayed, the manifold generates a single point source of sound that may be fed into an acoustic horn. Notably, by isolating the sound generated by each driver, the manifold minimizes reflections and resonances that often degrade the sound fidelity of conventional horn loudspeakers. Consequently, the disclosed manifold enables an acoustic horn to project coherent sound for significantly longer distances than the acoustic horn would achieve using a conventional manifold.

Various implementations include loudspeakers and related waveguides. The loudspeakers can include an adjustable waveguide for modifying the coverage pattern of the audio output. In some particular aspects, a loudspeaker includes: a single speaker box with at least one driver; a waveguide having: a pair of opposing walls that are fixed with respect to the at least one driver; and at least one adjustable wall that is adjustable relative to the at least one driver; and at least one fin coupled to the waveguide for accommodating a gap between the pair of opposing walls and the at least one adjustable wall.

Disclosed is a reinforcing part for a speaker diaphragm. The reinforcing part includes a body layer, and the body layer includes through-holes penetrating surfaces of two sides of the body layer. The reinforcing part further includes fillers located within the through holes and configured for heat conduction. The fillers have a thermal conductivity higher than that of the body layer. The reinforcing part of the present invention improves the heat conduction capability between two sides of a support layer by providing through holes on the support layer and providing a heat-conducting filler within the through holes.

A loudspeaker device includes first and second diaphragms arranged co-axially in an opposed relation to each other and having a rear volume in-between, each diaphragm having a plurality of motors operatively coupled thereto, and a frame having first and second ends, and first and second rims provided at the first and second ends, respectively. The motors of the first and second diaphragms are arranged in the same plane, and the motors are provided on the frame around the periphery of the first and second diaphragms.

A voice-controlled electronic device that includes a device housing having a longitudinal axis bisecting opposing top and bottom surfaces and a side surface extending between the top and bottom surfaces. The device can further include one or more microphones disposed within the device housing and distributed radially around the longitudinal axis; a processor configured to execute computer instructions stored in a computer-readable memory for interacting with a user and processing voice commands received by the one or more microphones and first transducer and second transducers configured to generate sound waves within different frequency ranges.

A compression driver including an acoustic outlet duct, a magnetic assembly having a permanent magnet and an air gap, a vibrating membrane with a movable coil adapted and configured to move inside the air gap, where the vibrating membrane includes a first face facing a first chamber communicating with the outlet duct, where the first chamber is a compression chamber, a second face opposite to the first face and facing a second chamber communicating with the air gap and opposite to the first chamber, where the compression driver includes at least one acoustic connection duct which puts in communication the second chamber with the acoustic outlet duct.

A compression driver for an omnidirectional loudspeaker includes a motor assembly and a dome diaphragm disposed coaxially above and operably connected to the motor assembly, the diaphragm having a convex surface and a concave surface. The compression driver includes a phasing plug having a top portion and a bottom portion having a concave bottom surface disposed adjacent the convex surface of the diaphragm and defining a compression chamber therebetween. The phasing plug includes a plurality of conduits extending through the bottom portion for sound waves to travel and converging to form an annular exit, the top portion including a plurality of radially expanding channels acoustically connected to the annular exit. Actuation of the diaphragm by the motor assembly generates sound waves within the compression chamber which travel through the annular exit and the radially-expanding channels to create a generally horizontal 360° radiation pattern of the sound waves from the compression driver.