| 摘要 |
PURPOSE: To provide a compact, light, and inexpensive speaker system capable of realizing sufficient low sound reproduction. CONSTITUTION: This MFB signal controller 11 is provided with a vibration displacement calculating part 12 for generating a vibration displacement detection signal according to the input of a vibration detection signal to be obtained from a coil 7 for detecting the vibration of a speaker unit, a vibration speed calculating part 13 for generating a vibration speed detection signal according to the input of the vibration detection signal, a processing signal generating part 14 for generating a feedback signal according to the input of the vibration displacement detection signal and the vibration speed detection signal, and an adder 15 for synthesizing the feedback signal with an acoustic signal to be outputted from an acoustic reproduction device 106, and for inputting it to a voice coil 6 for driving the speaker unit.
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