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About: Moving iron speaker     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: yago:WikicatLoudspeakersyago:Artifact100021939yago:Device103183080yago:ElectricalDevice103269401yago:Electro-acousticTransducer103274561yago:Instrumentality103575240yago:Loudspeaker103691459yago:Object100002684yago:PhysicalEntity100001930yago:Transducer104470953yago:Whole100003553 New Facet based on Instances of this Class

The moving iron speaker was the earliest type of electric loudspeaker. They are still used today in some miniature speakers where small size and low cost are more important than sound quality. A moving iron speaker consists of a ferrous-metal diaphragm or reed, a permanent magnet and a coil of insulated wire. The coil is wound around the permanent magnet to form a solenoid. When an audio signal is applied to the coil, the strength of the magnetic field varies, and the springy diaphragm or reed moves in response to the varying force on it. The moving iron loudspeaker Bell telephone receiver was of this form. Large units had a paper cone attached to a ferrous metal reed.