| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sound radiation speaker box that provides a sound effect very close to the natural sound without directivity. SOLUTION: An middle sound frequency resonant board 51 and a low sound frequency resonant board 52 are adhered to the front face of a box 10, and a high sound frequency sound source 20, a middle sound frequency sound source 30 and a high sound frequency sound source 40 are directly or indirectly fixed to a support pillar 13 stood upright in the inside of the sound box 10. In the high sound frequency sound source 20, a voice coil 21 excited in a magnetic circuit is housed in an exciting box 22 and the voice coil 21 is fixed to a high sound frequency resonant board 53 adhered to the front face of the exciting box 22. The respective voice coils 31, 41 of the middle sound frequency sound source 30 and the low sound frequency sound source 40 are fixed to the middle sound frequency resonant board 51 and the low sound frequency resonant board 52, respectively. The sound box 10 acts like an instrument by the vibration of the resonant boards 51, 52, the surface vibration of the sound box 10 and the air vibration in the inside of the sound box 10, and an acoustic effect with full of presence very close to natural sound can be obtained.
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