| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker with a voice coil control function that enhances a level of a velocity signal detection voltage. SOLUTION: A tail end of a detection coil is joined with a front end of a connection tube connecting a voice coil to a velocity detection coil or the detection coil is joined with an inner face of the connection tube so as to bring the detection coil closer to a magnetic piece by at least the thickness of the connection tube.
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