The Anatomy of a Speaker: Pt 2

14 Dec 2014

There are many other types of driver designs beyond the common cone-and-coil construction.

  • Horn speakers are acoustic megaphones that require very large enclosures to be able to reproduce sound.

 

 

  • Piezoelectric speakers are commonly used in electronic devices to reproduce beeps as in, say, a watch.
     
  • Instead of using a magnetic field to reproduce sound as in a dynamic speaker, electrostatic speakers use a high voltage electrical field to drive a statically charged membrane.
     
  • Magnetostrictive speakers originated in sonar technology.  In this design, the magnet-and-coil assembly remains stationary instead of moving with the driver.
     
  • Ribbon and planar magnetic speakers use a ribbon of metal suspended in a magnetic field.  When an electrical signal is applied to the ribbon, it moves and produces sound.
     
  • Flat panel speakers feature voice coils mounted directly onto flat panels that can be hung almost invisibly on walls.
     
  • Other speaker designs include plasma arc, distributed mode, bending wave and Heil air motion transducers.
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