A speaker diaphragm includes a substrate. The substrate includes a resin matrix and fibers. The resin matrix contains a thermoplastic resin as a main component. The fibers are dispersed in the resin matrix. The fibers are polyparaphenylenebenzobisoxazol fibers. An average length of the fibers is 0.5 mm or more and 3.0 mm or less.

A non-dispensing manufacturing process includes forming a paper cone; engaging the paper cone with a voice coil to form a vibration assembly; fixing a yoke, a magnet set, and a washer to form a magnetic circuit assembly; engaging a basket with the magnetic circuit assembly; and engaging the basket with the vibration assembly to form a speaker, where no glue is used in the manufacturing process. A speaker includes a paper cone; a voice coil engaged with the paper cone to form a vibration assembly, where a junction between a bobbin of the voice coil and the paper cone has a first welding layer; a magnetic circuit assembly including a yoke, a magnet set, and a washer that are integrally fixed; and a basket engaged with the magnetic circuit assembly and the vibration assembly.

A liquid-resistant module can be formed as a laminated construct having a housing, a cap, and a port membrane to inhibit liquid from passing across the membrane. The housing defines an internal duct extending from an inlet port to an outlet region. The cap defines an acoustic port and extends across the outlet region of the housing. The port membrane is attached to the cap and extends across the acoustic passage. The port membrane inhibits passage of liquid water through the membrane at differential pressures across the membrane less than a threshold pressure differential, and yet is gas permeable. The module can provide a liquid-resistant seal with an enclosure of an electronic device, and an enclosed microphone transducer or an enclosed loudspeaker transducer can be attached to the cap such that a port opening to or from the transducer is aligned with the acoustic port.

A loudspeaker diaphragm (12) comprising a woven fibre body supports damping material (25), for example PVA polymer, on a rearward-facing surface (24). The woven fibre body may be formed of lengths (14) non-metallic fibre material (for example glass fibre) coating with a thin metal coating (32). The mass of the layer of damping material (25) may be less than the mass of the woven fibre body. An attractive sparkly looking loudspeaker diaphragm (12) may thus be provided which damps undesirable vibration whilst providing a flatter frequency-response curve (50).

A speaker diaphragm includes a plurality of highly rigid layers and a porous layer. Each of the plurality of highly rigid layers includes a first resin matrix, and wood fibers and highly rigid fibers dispersed in the first resin matrix. The porous layer includes a second resin matrix comprising independent pores, and fibers comprising wood fibers and highly rigid fibers dispersed in the second resin matrix. Both outermost layers are the highly rigid layers. A percentage content of the wood fibers in the highly rigid layers is 10% by mass or more and 65% by mass or less. A percentage content of the highly rigid fibers in the highly rigid layers is 5% by mass or more and 40% by mass or less. A percentage content of total fibers in the porous layer is 15% by mass or more and 40% by mass or less.

Water impermeable, air permeable membrane assemblies are described herein. In some embodiments, the assemblies include a polymer membrane and at least one support layer. Certain assemblies are configured to provide an acoustic impedance having phase angle of +45 degrees to 45 over a frequency range of 50 to 20,000 Hz.

An audio amplified combustion system is described that has a fuel injector a positioned proximate to a speaker so that a flame moves in concert with audio emitted from the speaker. A projection column and projection top can be positioned above the cone of the speaker to define a volume for the combustion. Various apparatuses, methods, and systems for keeping the speaker cool are also described. Coating on various parts of the system to increase or decrease emissivity or absorptivity of various parts can keep the speaker cool. In addition, a control unit can cause the speaker to pant or vibrate at a low or high frequency to induce convective and keep the speaker cool. These and other features of the audio amplified combustion system are described herein.

A vibration component for loudspeakers includes a base layer, an intermediate layer, and a coating layer. The base layer has a front face and a rear face, has a first density, and is formed of a paper body containing a plurality of fibers. The intermediate layer has a first face joined to the front face of the base layer, and a second face on a reverse side of the intermediate layer from the first face, has a second density higher than the first density, and includes a plurality of cellulose fibers as a main component. The coating layer is provided on the second face of the intermediate layer, and includes an inorganic powder formed of a plurality of inorganic fine particles.

A transducer in which electrical connections between electrode sheets and leading wires can be secured via an approach other than soldering or welding is provided. In a sheet body portion, a dielectric layer and a first electrode sheet are joined by a first main fusion layer formed of a fusion material. A first conductive portion of a first leading wire is fixed to the sheet body portion by a first clamp. The first clamp includes a plurality of first leg portions that penetrates the sheet body portion in a thickness direction, a first coupling portion that couples the proximal ends of the plurality of first leg portions and is disposed across the first conductive portion, and a plurality of first bent-back portions that is formed by bending the respective distal ends of the plurality of first leg portions and is locked with a second surface of the sheet body portion.

A dome material, a diaphragm and a speaker are provided. The speaker includes the diaphragm made of the dome material. The dome material includes an intermediate layer, an adhesive layer, a film layer, and a surface layer. The adhesive layer, the film layer, and the surface layer are sequentially stacked on the intermediate layer in a direction away from the intermediate layer. The intermediate layer is formed by a foamed material. A thickness of the adhesive layer is 3-20 m. The film layer is adhered to the intermediate layer via the adhesive layer. A thickness of the film layer is 2-20 m. The surface layer adopts fiber prepreg including fiber and resin, the fiber is unidirectionally arranged, and a weight percentage of the fiber is 20%-50%. A surface density of the fiber prepreg is 10-100 g/m.sup.2.