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2. 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.

3. AKG (company) - Wikipedia

   en.wikipedia.org/wiki/AKG_(company)

   About this time, the company developed its first patents, the moving coil technology and the principle of mass load membranes, allowing its products to have extended frequency ranges. [ 5 ] With the creation of the D12 microphone in 1953, AKG achieved international fame, setting the standard for voice transmissions.

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. Loudspeaker - Wikipedia

   en.wikipedia.org/wiki/Loudspeaker

   The original loudspeaker design was the moving iron. Unlike the newer dynamic (moving coil) design, a moving-iron speaker uses a stationary coil to vibrate a magnetized piece of metal (called the iron, reed, or armature). The metal is either attached to the diaphragm or is the diaphragm itself. This design originally appeared in the early ...

6. Electromagnetic acoustic transducer - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_acoustic...

   An electromagnetic acoustic transducer (EMAT) is a transducer for non-contact acoustic wave generation and reception in conducting materials. Its effect is based on electromagnetic mechanisms, which do not need direct coupling with the surface of the material.

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