| 摘要 |
PURPOSE:To increase the sound pressure of minimum resonance frequency by connecting a parallel circuit composed of a coil and capacitor between two woofers of the same characteristic and then connecting a serial circuit composed of a coil and capacitor between two same polarity terminals for speaker. CONSTITUTION:Output terminals 1 and 2 of an amplifier 10 are connected to a positive terminal 3 of a speaker 7 and a negative terminal 6 of a speaker 8, respectively. Moreover a parallel circuit composed of a coil L1 and a capaciter C1, both of which resonate the using minimum frequency, is connected between a negative terminal 4 of the speaker 7 and a positive terminal 5 of the speaker 8, while serial circuits for resonating the same low frequency are connected between the positive terminals 3 and 5 of the speakers 7 and 8 and between the negative terminals 4 and 6 of said speakers 7 and 8. In the frequency except this resonance one, a serial resonance circuit and a parallel resonance circuit come to high and low impedances, respectively, while in the resonance frequency the magnitude of the impedance inverts and the speakers 7 and 8 equivalently become serial in the low frequency. Thus the sound pressure in the low frequency can be increased irrespective of the characteristic of the amplifier 10. |
