Swan's neck' loudspeaker with electromagnetic motor

Radio enthusiasts developed the electrodynamic loudspeaker in the 1930s. Its acoustic process provided high-quality, undistorted listening over a wider frequency range, particular in low frequencies. The coil of the motor that powers this loudspeaker is placed in an electromagnetic field generated by a powerful electromagnet. The motor transforms the electromagnetic waves into mechanical vibrations that act on a membrane to reproduce the sound. This model comes from the Conservatoire’s telephonovision chair, whose professor, Eugène Huguenard, perfected the electrodynamic loudspeaker by concentrating on the design of the diffuser.