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A 7.5 cm diameter dual voice coil from a subwoofer driver. A voice coil (consisting of a former, collar, and winding) is the coil of wire attached to the apex of a loudspeaker cone. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it.
The permanent magnet upgrade of the 601 was released in 1944 as the 604, at which point the 601 was discontinued. [5] The 604 was the same basic design using a 15-inch LF driver, but with a larger 3" voice coil, individual Alnico V magnets for the LF and HF drivers, and a cast aluminum frame.
The voice coil in moving coil drivers is suspended in a magnetic field provided by the loudspeaker magnet structure. As electric current flows through the voice coil (from an electronic amplifier), the magnetic field created by the coil reacts against the magnet's fixed field and moves the voice coil (and so the cone). Alternating current will ...
In a ribbon speaker, the voice coil may be printed or bonded onto a sheet of very thin paper, aluminum, fiberglass or plastic. This cone, dome or other radiator is mounted at its outer edge by a flexible surround to a rigid frame which supports a permanent magnet in close proximity to the voice coil. For the sake of efficiency, the relatively ...
Instead of a voice coil driving a speaker cone, a magnetostatic speaker uses an array of metal strips bonded to a large film membrane. The magnetic field produced by signal current flowing through the strips interacts with the field of permanent bar magnets mounted behind them. The force produced moves the membrane and so the air in front of it.
In principle, this approach relies on the same concept as a voice coil-driven cone speaker, but in a Magneplanar speaker the "voice coils" are attached (glued) directly to the radiating surface. Since the force is applied only to the voice coil in a cone speaker, there are distortion modes called cone breakup; in the magneplanar speakers the ...