Electroacoustic Sound Transducer Unit and Earphone
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United States of America Patent
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Issued Date -
Jun 8, 2017
app pub date -
Dec 6, 2016
filing date -
Dec 8, 2015
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Abstract
There is provided an electroacoustic sound transducer comprising a diaphragm and at least a first and a second coil coupled to the diaphragm so that the first and second coils can vibrate together with the diaphragm. The electroacoustic sound transducer unit has an impedance switching-over unit for connecting together the at least first and second coils to provide a series circuit or a parallel circuit or for contacting the first coil or the second coil.
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