The present invention provides a speaker including a first frame, a second frame, a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system includes a first diaphragm and a first voice coil. The second vibration system includes a second diaphragm and a second voice coil. The magnetic circuit system includes a first main magnet, first auxiliary magnets, a second main magnet and second auxiliary magnets. A projection of the first voice coil along a vibration direction of the speaker is located out of the second voice coil, and the projection of the second voice coil along the vibration direction of the speaker is located on the first main magnet. In present invention, the BL of the second voice coil is increased, the sensitivity of the speaker is improved, and the loudness becomes larger.

The present invention discloses a speaker device and electronic equipment. The speaker device comprises a speaker body, an audio signal input terminal connected with the speaker body, and a DC voltage signal input terminal connected with the speaker body. The electronic equipment comprises the speaker device and a DC voltage signal output circuit. The present invention further discloses a method for reducing a low frequency distortion degree of the speaker of the electronic equipment, and the method is realized by additionally providing a DC voltage signal to the input end of the speaker. In the present invention, a distortion degree of the speaker device at a low-frequency working condition can be reduced, and inconsistency of low frequency distortion of the speaker device, caused by mass production, can be reduced.

A loudspeaker is provided with a magnet assembly with an overall length aligned along a longitudinal axis and a frame with a wall encircled around the magnet assembly with a length aligned along the longitudinal axis, wherein the magnet assembly and the wall define a voice coil gap. The loudspeaker is also provided with a voice coil disposed in the voice coil gap; wherein the magnet assembly is symmetrically aligned with the wall such that a halfway point of the overall length of the magnet assembly coincides with a midpoint of the length of the wall.

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers can be used at all audio frequencies, including subwoofer frequencies. The magnetic negative springs of the electroacoustic drivers can cancel, or partially cancel, the large pressure forces on a sound panel (of an audio speaker) so that substantial subwoofer notes can be efficiently and cost effectively produced in small/portable speakers. The electroacoustic drivers can include a stabilizing/centering mechanism to overcome the destabilizing forces of a MNS that are too large for a voice coil alone to produce.

The present disclosure application relates to a transducer, a loudspeaker, and an acoustic output device. The transducer comprises: a magnetic circuit system, including a magnet assembly and a magnetic conductive cover, the magnetic conductive cover being arranged at least partially around the magnet assembly; and a vibration plate, including a first vibration plate and a second vibration plate, the first vibration plate and the second vibration plate being respectively distributed on both sides of the magnet assembly along a vibration direction of the magnet assembly, and being used to elastically support the magnet assembly within the magnetic conductive cover, wherein a resonance peak frequency of the transducer is less than 300 Hz.

A loudspeaker is provided with a magnet assembly with an overall length aligned along a longitudinal axis and a frame with a wall encircled around the magnet assembly with a length aligned along the longitudinal axis, wherein the magnet assembly and the wall define a voice coil gap. The loudspeaker is also provided with a voice coil disposed in the voice coil gap; wherein the magnet assembly is symmetrically aligned with the wall such that a halfway point of the overall length of the magnet assembly coincides with a midpoint of the length of the wall.

In one embodiment, there is described a new transducer, and in particular an improved system and method for producing linear motion for a transducer such as used in voice coils converting from an electrical input to a mechanical linear motion input.

The invention relates to a system which comprises a loudspeaker, an amplifier, a position measuring device, a receiving device, and a sending device. The loudspeaker comprises a magnet system, a membrane movably mounted with respect to the magnet system, and a voice coil attached to the membrane. The position measuring device is configured to generate a position signal indicative of the current position of the membrane with respect to the magnet during operation of the loudspeaker. The sending device is configured to generate and to send a signal via the electric leads to the receiving device in response to the position signal. The signal comprises an information about the current position of the membrane with respect to the magnet, the receiving device is configured to extract the information from the signal, and the amplifier is configured to generate the electric signal in response to the extracted information.

The present invention discloses a speaker device and electronic equipment. The speaker device comprises a speaker body, an audio signal input terminal connected with the speaker body, and a DC voltage signal input terminal connected with the speaker body. The electronic equipment comprises the speaker device and a DC voltage signal output circuit. The present invention further discloses a method for reducing a low frequency distortion degree of the speaker of the electronic equipment, and the method is realized by additionally providing a DC voltage signal to the input end of the speaker. In the present invention, a distortion degree of the speaker device at a low-frequency working condition can be reduced, and inconsistency of low frequency distortion of the speaker device, caused by mass production, can be reduced.

An electro-acoustic transducer has an acoustic diaphragm and a voice-coil. The diaphragm defines a first major surface. A flange extends from the diaphragm in a direction opposite the first major surface. The voice-coil has a first plurality of windings positioned adjacent to the acoustic diaphragm and a second plurality of windings positioned distally from the acoustic diaphragm. The flange overlaps the first plurality of windings. The flange and the windings can be adhesively bonded with each other to form a lap joint. The lap joint can transfer force from the voice-coil to the diaphragm.