Loudspeaker with a jacketed magnetic core

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The invention concerns a loudspeaker according to the dynamic transducer principle. This loudspeaker shows a permanent magnet 1, which exhibits a core 10 from a high-magnetic alloy with an element of the group the rare ground connection, in particular from a neodymium alloy. These alloys are strong oxidation-endangering and react very violently to air humidity. This core 10 is covered up by a plastic film 11, the particles from an appropriate alloy with an element from the group the rare ground connection exhibits. By this structure of the permanent magnet a very strong magnetic field is given 1, which causes a high efficiency of the loudspeaker. Besides this permanent magnet 1 proves to the loudspeaker according to invention as a little susceptible to external harmful influences.