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2. Air Motion Transformer - Wikipedia

   en.wikipedia.org/wiki/Air_Motion_Transformer

   The Air Motion Transformer (AMT) is a type of electroacoustic transducer.Invented by Oskar Heil (1908–1994), it operates on a different transduction principle from other loudspeaker designs, such as moving coil, planar magnetic or electrostatically-driven loudspeakers, and should not be confused with planar or true ribbon loudspeakers.

3. Electrodynamic speaker driver - Wikipedia

   en.wikipedia.org/wiki/Electrodynamic_speaker_driver

   The coil and the driver's magnetic system interact in a manner similar to a solenoid, generating a mechanical force that moves the coil (and thus, the attached cone). Application of alternating current moves the cone back and forth, accelerating and reproducing sound under the control of the applied electrical signal coming from the amplifier.

4. Sonar - Wikipedia

   en.wikipedia.org/wiki/Sonar

   Other types of transducers include variable-reluctance (or moving-armature, or electromagnetic) transducers, where magnetic force acts on the surfaces of gaps, and moving coil (or electrodynamic) transducers, similar to conventional speakers; the latter are used in underwater sound calibration, due to their very low resonance frequencies and ...

5. Electrical characteristics of dynamic loudspeakers - Wikipedia

   en.wikipedia.org/wiki/Electrical_characteristics...

   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 ...

6. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   Working from a laboratory in Napa, California, they filed the first patent for a moving coil loudspeaker in 1911. [9] Four years later, in 1915, they built a dynamic loudspeaker with a 1-inch (2.5 cm) voice coil , a 3-inch (7.6 cm) corrugated diaphragm and a horn measuring 34 inches (86 cm) with a 22-inch (56 cm) aperture.

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