Embodiments relate to a diaphragm having high rigidity and high internal loss. The diaphragm may comprise: a matrix-shaped structure including a plurality of through-holes; and a graphene layer disposed in at least a part of the plurality of through-holes and coupled to the structure.

One embodiment provides an acoustic transducer including a diaphragm connected to an upper portion. A first voice coil is connected to a first side of the diaphragm. A second voice coil is connected to a second side of the diaphragm. A first magnetic motor assembly is connected to a first side of a lower portion. A second magnetic motor assembly is connected to a second side of the lower portion. An electronics system is connected to the lower portion and disposed behind the diaphragm and between the first magnetic motor assembly and the second motor assembly. The first voice coil is at least partially disposed within a gap of the first magnetic motor assembly, and the second voice coil is at least partially disposed within a gap of the second magnetic motor assembly.

The invention relates to a speaker diaphragm. The speaker diaphragm is composed of a dome portion located in the center and a circle of outer arc portion connected to the circumferential outer side of the dome portion. An outer diameter of the diaphragm is 38.9 mm to 39.95 mm. The dome portion has a dome height of 3.0 mm to 3.4 mm. The outer arc portion has an arc top height of 1.6 mm to 1.8 mm. An effective height between the dome portion and the outer arc portion is 0.8 mm to 1.0 mm. According to the speaker diaphragm of the invention, by increasing the effective height of the diaphragm and the dome height and by changing an outer arc shape and a pattern shape, the overall strength of the diaphragm is improved, the frequency peaks and valleys in a frequency response curve are reduced, and the high frequency is raised. In addition, a layer of PU damping material is also compounded between two different materials (PAR layer+PEEK layer) to increase the damping of the diaphragm.

A sound system is provided with a headphone that includes a transducer and at least one microphone. The sound system also includes an equalization filter and a loop filter circuit. The equalization filter is adapted to equalize an audio input signal based on at least one predetermined coefficient. The loop filter circuit includes a leaky integrator circuit that is adapted to generate a filtered audio signal based on the equalized audio input signal and a feedback signal indicative of sound received by the at least one microphone, and to provide the filtered audio signal to the transducer.

A loudspeaker assembly includes: a chassis; a loudspeaker, including a drive unit and a diaphragm. The diaphragm includes a body portion and inner and outer suspension portions, wherein the body portion extends between the inner and outer suspension portions. The drive unit moves the body portion along a movement axis. The body portion has a front face facing forwards and a rear face facing rearwards parallel to the movement axis. The outer suspension portion is integral with the body portion, and is attached to the chassis at a first attachment location such that the body portion is suspended from the chassis. The inner suspension portion is integral with the body portion, and is attached to the chassis at a second attachment location such that the body portion is suspended from the chassis. The first and second attachment locations have separate first and second positions along the axis, respectively.

A loudspeaker for hearing devices including a diaphragm arranged in a housing to form a back volume and a front volume acoustically coupled to a sound port is disclosed. A surface of a first magnet in the front volume faces an opposing surface of a second magnet in the back volume, and the opposing surfaces of the magnets are separated by a gap and have the same magnetic polarity. An electrical coil assembly coupled to the diaphragm has a radial difference dimension to thickness dimension ratio greater than 1, wherein the diaphragm and the electrical coil assembly are movable in the gap between the magnets in response to an electrical audio signal applied to the electrical coil assembly.

An audio demonstration kit encourages understanding of audio concepts by enabling children to construct and study speaker performance. In a particular embodiment, the audio demonstration kit includes a paper speaker and instructions. The paper speaker includes a backplate, a suspension, and a diaphragm cut from a single sheet of paper. The demonstration kit may feature an amplifier that is configurable to accommodate various hardware additions as a child is ready for more progressively challenging construction. For example, the amplifier of an embodiment allows single and dual mode operation, as well as drives a rotary motor and is coordinated with a strobe light. The amplifier of an embodiment is synchronized with the strobe light and a moveable platform to create the impression of that jiggling figures attached to the table are dancing. Interfaces with smart phone, recording, and other technologies further enhances and encourages the learning experience.

A loudspeaker diaphragm includes resin and hollow glass member particles contained in the resin. Further, a loudspeaker includes the above-described loudspeaker diaphragm, a magnetic circuit, a frame connected to the magnetic circuit, and a voice coil body having one end connected to the loudspeaker diaphragm and the other end disposed inside a magnetic gap in the magnetic circuit.

A display apparatus includes a display module including a display panel configured to display an image, a rear cover on a rear surface of the display module, and a sound generating module at the rear cover and configured to vibrate the display module to generate sound, and a rear surface of the sound generating module is covered by the rear cover.

A loudspeaker diaphragm includes a main material containing molecules each having a hydroxyl group, and a diamondoid derivative. The diamondoid derivative contains molecules each having two or more hydrogen-bonding functional groups. Each of the two or more hydrogen-bonding functional groups in each of the molecules of the diamondoid derivative is bonded to the hydroxyl group in each of the molecules of the main material.