| 摘要 |
PURPOSE:To keep a potential of a magnetic circuit constant at all times by connecting a potential of the magnetic circuit induced by a signal current flowing to a voice coil to ground earth or a negative output terminal connected to the ground and discharging the potential. CONSTITUTION:A 2-way speaker equipment consists of a woofer 1 and a tweeter 2 and they are connected to a positive input terminal 3 and a negative input terminal 4 connected to a positive terminal and a negative terminal of the output of an amplifier via a low pass filter LPF and a high pass filter HPF respective. Simultaneously, the magnetic circuit of the woofer 1 and the tweeter 2 are connected to the negative input terminal 4. Thus, a signal current flows to the voice coil of the woofer 1 and the tweeter 2 and a potential is induced in the magnetic circuit, then the potential of the magnetic circuit is decreased to the earth potential of the amplifier through the electric connection between the magnetic circuit and the negative input terminal 4. Thus, even when the signal current changes, no current is induced in the voice coil due to the potential of the magnetic circuit and the signal current waveform is not disturbed. |
