Electrodynamic loudspeaker cone shape mostly , dome -shaped ; cone speaker (cone speaker) structure.

Speaker cone structure can be divided into three parts:
1 > vibration system Bluetooth Speaker including the diaphragm , voice coil, dampers , dust cover , etc.
2 > of the magnet system comprises a magnetic plate , magnetic columns, the magnetic plate , a magnet , etc.
3 > auxiliary systems including frames, blank , wiring racks, phase plug strip .
According to Faraday 's law , when a current-carrying conductor through the magnetic field , an electromotive force Multimedia Speaker will be in a direction in line with Fleming 's left hand rule , force and current, the magnetic field direction perpendicular to each other , and the current size of the force , the length of the wire , a magnetic flux density proportional . When the voice coil audio input alternating current, alternating coil is subjected to a driving force alternating movement, led cone vibration, repeatedly pushing the air and sound.

Speaker Classification

Piezoelectric Speaker : using the inverse piezoelectric effect of piezoelectric materials and working speaker called a piezoelectric speaker . A dielectric ( such as quartz, crystalline sodium potassium tartrate , etc. ) occurs under pressure so that the Multimedia Speaker polarization potential difference between the both end surfaces of the phenomenon called " piezoelectric effect ." Its inverse effect, that is placed in the electric field of the dielectric elastic deformation may occur , known as " reverse piezoelectric effect" or " electrostrictive ."
Piezoelectric speakers compared with electrodynamic loudspeaker does not require magnetic and electrostatic speakers do not need to bias compared to a simple , cheap , big drawback is distorted and unstable.
Ion Speaker: In normal state , the molecular weight of the neutral atmosphere , it is not charged . But after a high-voltage discharge after becoming charged particles , a phenomenon known as ionized . The ionized air vibrations using an audio voltage , the resulting sound waves , which is the principle of ion speaker .
For ionization , it is necessary to 20MHz high frequency voltage , the piezoelectric overlapping audio signals thereon . Seen by the high-frequency oscillation section ion speaker , an Multimedia Speaker audio signal modulating section , the discharge chamber and horn components.
Discharge chamber using quartz rod diameter of 8mm hole in the center , open into a quartz tube , which is inserted an electrode and another electrode , the cylindrical sleeve in a quartz tube outside, thanks to the silent discharge form, only the center needle electrodes loss center electrode can be replaced periodically . Ion speaker that differs from other speakers at no diaphragm, so the transient characteristics and frequency characteristics are good, but the structure is too complex.
Fire Speaker : When the air and gas flame burning through the electrode , the electrode plus a DC voltage and high-frequency signals , fire and sound by audio signal modulation . Flame almost massless , dynamic sound excellent . But it has a fatal drawback : unsafe , inconvenient.
Airflow modulation Speaker : also known as airflow speaker. It is the use of compressed air as an energy source , the use of current modulation airflow sound audio speakers. It consists of the chamber , a modulation valve , horn and magnetic components. Compressed air from the air chamber through the valve , the external audio signal is modulated by that flow fluctuations vary according to the applied audio signal while being modulated by the air horn coupled to improve the efficiency of the system. It is mainly used as source or remote radio noise environments such as high-strength tests .

Car Speakers

One, easy to damp Mifengbuyan: Although the internal speaker is closed, but if Mifengbuyan wash the interior space into a mist or water vapor in the air, moisture vapor can easily lead to contacts does not work.
Second, the electromagnetic coil terminal bad: Some speakers inside the solenoid wire terminal connectors are Multimedia Speaker crimped aluminum rivet connections, non-reliable solder connection, if the insulating paint on the handle end wire without a net or a rivet crimping insecure easily produce virtual connection failure, resulting in poor horn work. Such failure is the speaker quality reasons, can not be repaired, only replaced with new parts.
Third, contact ablation: If prolonged honk the horn contact ablation and could easily lead to an impedance, the current flowing through the solenoid weakened, unable to attract the armature electromagnetic bookshelf computer speaker suction decline driven by the normal vibrations of the diaphragm, resulting pronunciation husky, do not even ring . But constantly honk if strong electric moment

In the traffic laws, the use of the car horn, made ​​such Speaker

1, motor vehicle approaching sharp bends, etc. affect the safety of the top of the ramp sections and overtaking sight or the event of an emergency, should slow down and honk to indicate.
2, the front of the vehicle in case the vehicle is parked or driving slowly while waiting in line, waiting or turn driving bookshelf speaker not enter non-motor vehicle lanes, sidewalks driving, urging shall honking vehicles and pedestrians.
In other words, the role of car horns, is a special section of the advance warning, the warning of some emergency Multimedia Speaker, in order to ensure traffic safety.

Car amplifier bass

Due to space limitations, car bookshelf speaker bass placed to achieve stability and good heat dissipation, the best choice is, of course, the car trunk. This inevitably brings two problems, one is how to reduce the volume of equipment to the trunk occupation and the function, the second is how to in as little as possible to destroy the car interior conditions to minimize the audio signal transmission line loss. Car stereo effect is inevitably affected by the engine sound, external airflow noise interference, these effects mainly focused on the bass drum and bass, so the car install bass speaker is particularly necessary. Just a mount and inferior bass, feel better than before, but listen to a period of time will feel, bass vague, bosom frowsty, mind after listening to get confused. This is because under the Multimedia Speakers of distortion into noise, the noise can damage the brain damage the body. Advice for sound of friends here, and don't covet is cheap sell junk, modified again found problems in the future, will abolish many equipment, spend more than necessary. Do not think that running must be expensive, both lobster and Fried potatoes. But the taste is worth tasting, here are even cheap packages, equipment quality guaranteed, and can enjoy the first-class installation technology and good after-sales service, will have the feeling of the value.

The working principle of the car horn

Auto electric horn is to rely on the Multimedia Speaker of the metal diaphragm to sound. Automobile electric horn by core, magnetic coil, contact, armature, diaphragm, etc. When the driver presses the horn switch, electricity flows through the contact through the coil, a coil magnetic suction under the armature, mandatory move diaphragm, armature move off contact, interrupt current, coil magnetic disappeared, diaphragm armature on bookshelf speaker own flexibility and spring leaf restored with in situ, contact closure reclosing circuit, current pass through magnetic coil, contact the repeat the action. So circular diaphragm vibration unceasingly, thus two sound. Soundboard and diaphragm rigid connection, can make the vibration smooth sounds more pleasing to the ear (namely electromagnet principle).

Digital audio

I speak here of the acoustical theory, the main is to make all aspects of a sound guy can understand acoustic, rather Multimedia Speaker the acoustic study, acoustic thesis or master, doctor, so I speak in this book in 1915, an American named e. supachai panitchpakdi ridham to a phone to listen to at that time set on a play sound horn, and the voice can give a group of people listening to celebrate Christmas in the city of San Francisco, electroacoustics was born. After the end of world war I, in the United States President Harding (Harding) his inauguration, the telephone bell companies in the United States of moving coil to connect at the time of the horn on the record player, will be able to pass the sound to watch the inauguration of a bookshelf computer speaker group of people, thus creates a lot of professional audio research and development the amplification engineering this science. The stereo sound researchers not only hard equipment was improved, also experimented with all kinds of different sound to understand human reaction to hearing. But the highest sound human with all know learning is to the overall research, understanding the each link, audio equipment and human physiological reaction to hearing, they made a great contribution.

Sound effects

To enjoy the concert. Multimedia Speaker spirits, this is not only due to the beautiful music melody? But important is that the scene of playing and singing sense of reality. Through the sound system and pored over recorded shows, however, will often make people feel monotonous and boring. This in addition to other factors, an important reason is that, in the process of program of record, put all the music signal through a signal channel caused by signal "crowded" and interfere with each other. So. In the modern hi-fi stereo systems? Besides using bookshelf computer speaker channel stereo system, and multi-channel stereo, surround sound, and to enhance the presence of various site digital delay circuit and sound processing circuit. These circuits in addition to restore the scene effect. Part of additional effect. But whether to restore the effect or add new effect. The goal is always to make maximum through sound system broadcast recording program, approach and to achieve the effect of a live performance, singing.

Speakers of miniaturization, digitalization, specialization, film and television

Miniaturization, digitalization, specialization, film and television is the inevitable trend of the development of home electronics. The stereo miniaturization. Multimedia Speaker desktop music center has a long history, more than 10 years ago has been advanced bookshelf computer speaker combined sound. But as a result of listening speakers, stereo gramophone, recording booth is not very good solution, so has been stay on the lower class. In order to create a small sound world, not only from the amplifier, control parts, left and right speakers, have to from the aspects of the tuner, CD player and recording booth together. Digital audio. Digital technology is a new technology, so the digital audio development in solving the problem of distortion of simulation of the acoustic noise. Sound using the digital technology, digital signal from the sampling frequency to the quantitative characteristics of records, has a clear resolution, no color dithering, get the image is very clear. And you can swap and the upper machine, the analog playback as equipment cannot match. Digital recording may take the time, name, address, entry, using tiny keyboard to complete the cataloging work, change the track number, coupled with the function of remote control, allows you to automatically search need to track, easy to use. The film and television equipment integration. Digital stereo as electroacoustic technology, film and television technology,