A loudspeaker includes a voice coil in a balanced state. In the loudspeaker, at least a first suspension element acts on a first side of the voice coil, and at least a second suspension element acts on a second side of the voice coil. The loudspeaker includes a symmetric magnet assembly. The voice coil aligns with the symmetric magnet assembly. The symmetric alignment contributes to the loudspeaker yielding substantially symmetric motor force (BL), suspension stiffness (K), and inductance (Le).

Example transducer assemblies are described here. An example transducer assembly may include a frame, a magnet carried by the frame, a voice coil operably coupled to the magnet, and a diaphragm. The diaphragm has an outer portion surrounding a central portion. The outer portion of the diaphragm has a generally concave shape, and the central portion of the diaphragm has a generally convex shape. The central portion of the diaphragm comprises a first surface facing toward the voice coil, and a second surface facing away from the voice coil. A coupler connects the voice coil to the first surface of the central portion.

Embodiments are provided for configurations of a loudspeaker. The loudspeaker may include a frame, a magnetic structure having a magnetic gap, a voice coil suspended within the magnetic gap, a first suspension element, a diaphragm, and a second suspension element. The first suspension element may have an inner rim and an outer rim attached to the frame. The diaphragm may have an outer portion and a continuous central portion attached to the voice coil via a first coupler. The outer portion of the diaphragm may be attached to the inner rim of the first suspension element. The second suspension element may have an inner rim and an outer rim attached to the frame. The inner rim of the second suspension element may be attached to the diaphragm via a second coupler along a circumferential middle section of the diaphragm between the continuous central portion and outer portion of the diaphragm.

Provided is a speaker device configured so that a time lag between a sound signal and a noise cancellation signal can be prevented, worsening of high-frequency characteristics can be avoided, and acoustic characteristics can be improved. A plane diaphragm 11 includes a flexible circuit board 20. A sound voice coil pattern 21 to which drive current corresponding to a sound signal is supplied and a noise cancellation voice coil pattern 22 to which drive current corresponding to a noise cancellation signal is supplied are formed on the flexible circuit board 20 and are formed corresponding to a formed magnetic field of a magnet 13.

According to an embodiment, a method of operating a microelectromechanical systems (MEMS) transducer that has a membrane includes transducing between out-of-plane deflection of the membrane and voltage on a first pair of electrostatic drive electrodes using the first pair of electrostatic drive electrodes. The first pair of electrostatic drive electrodes is formed on the membrane extending in an out-of-plane direction and form a variable capacitance between the first pair of electrostatic drive electrodes.

An acoustic device with an enclosure and a first passive radiator structure which includes a first passive radiator diaphragm. The first passive radiator structure has an effective radiating area and a first mass, and is mounted to the enclosure such that its diaphragm can vibrate relative to the enclosure. There is a second passive radiator structure which includes a second passive radiator diaphragm. The second passive radiator structure has substantially the same effective radiating area as the first passive radiator structure, and is mounted to the enclosure such that its diaphragm can vibrate relative to the enclosure. At least one active electro-acoustic transducer is mounted to the second passive radiator structure such that it moves when the diaphragm vibrates. The second passive radiator structure and the active transducer together have a second mass that is substantially greater than the mass of the first passive radiator structure. Passive radiators with the same effective radiating area results in force balancing of the device.

The object of the present invention is that the surplus vibration involved therewith simultaneously generating a sound wave by the vibration of the vibrating cone of the loudspeaker unit is generated in the loudspeaker system, which has impaired the sound quality of the loudspeaker system. The purpose of the present invention is to provide a technique for improving the sound quality by reducing the this surplus vibration which are the loudspeaker frame vibration and the cabinet vibration like a front baffle vibration. The present invention is characterized in being configured with a viscoelastic material layer upon rear portions such as the frame surface of the loudspeaker unit and inside and outside surfaces of each surface configuring the loudspeaker cabinet, and additionally suppresses vibration by addition of a heavy member or pressurization caused by constraint of a binding member.

A rubber voice diaphragm including distortion improving agent with mass percentage of 0.3% to 60%. The distortion improving agent is macromolecule polymer with hyperbranched structure, and has specific chemical crosslinking points with mass percentage of 0.01% to 15%. Branches of the macromolecule polymer with hyperbranched structure are long or short chain structures prepared by active polymerization. Each distortion improving agent molecule includes at least three long or short chain structures, and number-average molecular weight of the long chain structure or the short chain structure is 200 to 50000. The specific chemical crosslinking points are distributed at the outermost end of the hyperbranched structure, and the adjacent specific chemical crosslinking points are separated by at least six carbon atoms. The damping peak position, height, and width of the rubber voice diaphragm are controllable, thereby improving mechanical properties and ensuring stable performance and excellent processing performance of the rubber voice diaphragm.

A speaker includes: a frame, a vibration system fixed to the frame, including a diaphragm fixed to the frame and a voice coil driving the diaphragm to vibrate and emit sounds, and a magnetic circuit system fixed to the frame, wherein the diaphragm includes a dome and a suspension surrounding and connected with the dome, the dome includes a first metal dome with a through hole and a second dome covering the through hole, the first metal dome is located between the suspension and the second dome, and the first metal dome is fixedly connected with the suspension and the second dome. Compared with the related art, the speaker disclosed by the present disclosure has higher high frequency performance.

A system comprising a diaphragm having a first face and a second face, a roll surround disposed around a perimeter of the first face of the diaphragm, a modal coupling apparatus comprising a plurality of connecting arms and a central body, the modal coupling apparatus coupled to the second face of the diaphragm using the plurality of connecting arms, the central body having a shaped first end for receiving a voice coil former, a voice coil wound upon and secured to an outer surface on a first end of the voice coil former, a second end of the voice coil former placed within the shaped first end of the central body, and a positive electrical terminal and a negative electrical terminal, each terminal coupled to the voice coil for transmitting an electrical current through the voice coil upon receiving electrical power.