The speaker is also called the" horn ".Is a very common electroacoustic transducing device during phonation in the electrical and electronic equipment to be able to meet it.
The speaker in the audio equipment is one of the most fragile devices, and for sound effects, it is one of the most important parts.The speaker of the variety, and prices vary greatly.Audio electrical energy by means of electromagnetic, piezoelectric or electrostatic effect, so that the paper basin or vibration of the diaphragm and with the surrounding air to produce resonance ( resonance) and sound.According to the transducing mechanism and structure of moving coil type ( electric), capacitance ( electrostatic ), piezoelectric ( crystal or ceramic), electromagnetic ( spring type ), ion electric and pneumatic loudspeaker, electric loudspeaker with electroacoustic performance, firm structure, low cost, wide application according to the acoustic radiation ; materials of paper pot, horn type, diaphragm ; according to the cone shape round, oval, double cone and rubber suspension ring ; according to the working frequency sub bass, Alto, soprano, some also divided into recording machine, TV special, ordinary and high fidelity loudspeaker ; according to the voice coil impedance branch low impedance and high impedance; according to the effect of straight spokes and ambient sound.
The loudspeaker is divided into a built-in speaker and external speakers, while the external speaker is generally refers to the speaker.Built in speaker refers to the MP4 player with built-in speakers, so that the user can not only through the headphone jack is also available through built-in speakers to listen to the MP4 player sounds.With built-in speaker MP4 player, without external speakers, also can avoid long time wearing the earphone inconvenience.
The speaker features
(1 ) the speaker has two terminal ( two lead ), when the only speaker when using two pin is not divided into positive and negative polarity, multiple speakers also use two pins have the cent of polarity.
(2 ) the speaker has a carton, its color is usually black, there is also white.
(3 ) the speaker shape circular, square and oval, and other categories.
(4 ) the loudspeaker paper basin is back on the magnet outer magnetic loudspeaker with metal screwdriver to contact the magnet will feel the magnetic existence; internal magnet speaker without this kind of feeling, but inside the casing is a magnet.
(5 ) the speaker is installed on the machine on the panel or enclosure.
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