摘要 |
PROBLEM TO BE SOLVED: To obtain an MFB method speaker system by which a user uses its own amplifier. SOLUTION: A sound signal is given to a 1st voice coil 10-1 of a speaker unit 10. A vibration information detection means 91 consisting of a vibration displacement detection means 31, a vibration speed detection means 32, amplifiers 50-1, 50-2, and an adder 60 detects a signal proportional to a vibration displacement (x) and a signal proportional to a vibration speed (v) and sums them and a power amplifier 40 gives the sum to a 2nd voice coil 10-2 of the speaker unit 10 through positive or negative feedback.
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