Speaker the type of speaker
The loudspeaker is a kind of transducer that converts the current into an acoustic signal into an acoustic signal. The performance of the loudspeaker has a great influence on the sound quality.
(A) the type of speaker
There are many types of speakers, according to their conversion principle can be divided into electric (ie, moving coil), electrostatic (ie, capacitive), electromagnetic (ie, reed), piezoelectric (ie crystal) , The latter two are used for rural cable network; according to the frequency range can be divided into low-frequency speakers, intermediate frequency speakers, tweeter, which often used as a combination of speakers in the speaker.
(1) low frequency speakers
For a variety of different speakers, the low-frequency speaker quality factor - Q0 value requirements are different. For the closed box and inverted box, Q0 value is generally between 0.3 to 0.6 the best. In general, the lower frequency of the low-frequency speakers, magnets and voice coil diameter larger, low-frequency playback performance, the better the transient characteristics, the higher the sensitivity. The structure of the woofer is mostly cone-type, there are a small amount of flat. Bass diaphragm of a wide range of diaphragm, aluminum alloy diaphragm, aluminum-magnesium alloy diaphragm, ceramic diaphragm, carbon fiber diaphragm, bullet-proof cloth diaphragm, glass fiber diaphragm, propylene diaphragm, paper diaphragm, and so on. The use of aluminum alloy diaphragm, glass fiber diaphragm of the bass unit is generally smaller caliber, to withstand the power is relatively large, and the use of reinforced cone, glass fiber diaphragm of the bass unit replay music sound more accurate, the overall balance is good.
(2) intermediate frequency speakers
In general, IF speakers as long as the frequency response curve is flat, the effective frequency response range is greater than it in the system to bear the width of the sound band, impedance and sensitivity and low frequency unit can be consistent. Sometimes the midrange power capacity is not enough, you can also choose a higher sensitivity, and impedance higher than the bass unit of the midrange, thereby reducing the actual input power of the midrange unit. Alto units are generally cone and dome two. But its size and bear the power than the tweeter large and suitable for playing audio only. Alto unit diaphragm to the cone and silk film and other soft substances, and occasionally a small amount of alloy ball dome film.
The tweeter is the name of the loudspeaker unit in order to play back the high frequency sound. Its structure is mainly the number of decks, cone-type, the top of the ball and aluminum belt and other categories.
(B) the structure and working principle of electric speakers
The most widely used electric speakers, it is divided into two kinds of pot-type, trumpet and dome-shaped. Here only the first two.
1, cone-type speaker
The cone-type loudspeaker is also known as moving coil loudspeaker. It consists of three parts: ① vibration system, including conical cone, voice coil and centering tablets, etc .; ② magnetic circuit system, including Yongyi magnet, magnetic plate and field pillars; ③ auxiliary system, including pots Frame, wiring board, pressure side and dust cover and so on. When the magnetic field in the voice coil through the audio current through, it will produce with the audio current changes in the magnetic field, the magnetic field and permanent magnet magnetic field interaction, the voice coil along the axial vibration, the speaker structure is simple, bass full , Soft sound quality, bandwidth, but less efficient.
2, trumpet speaker
The structure of a bell-type loudspeaker, which consists of a vibration system (treble head) and a horn. The vibration system is similar to the cone speaker, except that its diaphragm is not a cone, but a ball-shaped diaphragm. The vibration of the diaphragm passes through the horn (after two reflections) to radiate sound waves into the air. It's high frequency, large volume, commonly used in outdoor and square sound reinforcement.
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