Common loudspeakers sound Autocom way

At present most of the horn are still use Autocom the traditional cone tub monomer movement before and after the voice, more academic parlance, the trumpet call electrodynamic (Electrokinetic Dynamic) or Moving Coil (Moving Coil). In the early 1877 years of German Siemens Erenst Vemer have moving-coil loudspeakers patent, but vacuum tube late to matters 0 seven years to formal use, but Edison the first player is stylus directly drive the diaphragm and then the horn amplification voice, so Siemens patent has not used. In 192 the United States singular company Chester Rice and Edward Kerrog and Edison bell company p. G.H okuto first to develop practical moving coil horn, for more than seventy years, in addition to material continuously improved outside, you take is the horn technology really have progress? Below are some common horn sound mode:

A, moving coil. Basic  Autocom  principle from Fleming left hand's law, a current word line and magnetic line of force vertical in the magnet north and south electrode, way line will be magnetic line of force and the current of the two interact with each other and mobile, in put a piece of diaphragm attachment in the word online, with the current change diaphragm has before and after the movement. At present more than ninety percent of the cone basin monomer are moving coil design.

Second, the electromagnetic. In a U type magnet in the middle of the erection removable cut plate (armature), when current flows through the coil armature are magnetization and magnet produces suction spending phenomenon, and at the same time, drive the diaphragm movement. This kind of design cost is low but the effect not beautiful, so multi-purpose in receiver and small on the headphones.

Three, inductive. And the electromagnetic principle close, but armature double, and magnet on the two voice coil is not symmetrical, when the signal current through the two armature to different flux will push each other and movement. And electromagnetic is different place is inductance can be regenerated lower frequency, but the efficiency is Cable for Renault Can Clip  very low.

Four, electrostatic. The basic principle is urga (Coulomb) law, usually in the form of plastic qualitative diaphragm and aluminum inductive materials vacuum evaporation process, two diaphragm face to face put, when one piece with positive current high voltage when another slice of will induction out small current, by each other mutual attract repulsion action to promote air can make a sound. Electrostatic monomer because light quality and vibration dispersed small, so it was very easy to get clear transparent Alt, the bass power have not got caught, and its efficiency is not high, the use of dc original and easy to gather dust. At present such as Martin - Logan and manufacturers have successfully developed a static and moving coil hybrid horn, solve the electrostatic body bass the problem of insufficient, in the use of electrostatic earpiece is also widely.