| 摘要 |
PROBLEM TO BE SOLVED: To damp vibration with a resonance frequency specific to a speaker so as not to give a large effect on other frequencies and to avoid a sound output from being attenuated as a result of the damping. SOLUTION: The composite speaker 10 consists of speaker 4, 7 that have different specific resonance frequencies. BEFs 2, 5 that are band elimination filters are used to eliminate bond frequencies which correspond to resonance frequencies specific to the speakers 4, 5 from an electric acoustic signal received at an input terminal 1 and the speaker 4, 7 are driven through output amplifiers 3, 6.
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