| 摘要 |
PURPOSE:To suppress distortion of a power amplifier due to high frequency noise and to improve sound quality by inserting a series circuit comprising a capacitor and a resistor between an input terminal of a speaker and a hot/cold line of an inter-network circuit. CONSTITUTION:A series circuit 8 of a capacitor 8a and a resistor 8b having a resistance close to a transfer impedance of a speaker cable 6 is inserted between a hot line and a cold line between an input terminal 5 and a network circuit 4 of a speaker system 1. Through the above-mentioned constitution, most of high frequency noise outputted from air-core coils 4a, 4d passes through the circuit 8 and the portion of the noise sent to a power amplifier 7 through the cable 6 is reduced. On the other hand, the high frequency component outputted from the amplifier 7 is absorbed in the resistor 8b through the cable 6 and not reflected thereat. Thus, the operation of the amplifier 7 is made stable and the sound quality is improved. |
