| 摘要 |
PROBLEM TO BE SOLVED: To prevent a loudspeaker from catching fire due to an excess input. SOLUTION: A protection sheet 15 to be broken by a generated heat, through which a prescribed current flows is placed to an outer circumference of a bobbin 12. The protection sheet 15 is connected in series with a voice coil 13. An output of a power amplifier is supplied to a series circuit, comprising the voice coil 13 and the protection sheet 15.
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