| 摘要 |
PURPOSE:To prevent a degradation of a frequency characteristic of reproduced sounds by providing a capacitor and the second variable resistance, which is connected in parallel to the capacitor and is interlocked with the first variable resistance, between the slide terminal of the first variable resistance and the ground. CONSTITUTION:Parallel circuits consisting of capacitors C1 and C2 and variable resistances 11 and 12 are connected between slide terminals 2' and 3' of variable resistances 2 and 3 and the ground respectively. A capacity of these capacitors C1 and C2 is so set that its impedance 1/SC is sufficiently smaller than a resistance value R of resistances 11 and 12 when slide terminals 11' and 12' are slided down in directions of arrows up to limits. When variable resistances 2 and 3 are operated to raise the level of audio signals supplied to speakers 8L and 8R inferior in low band reproducing characteristic, capacitors C1 and C2 are made available, and low frequency components are applied, and the low sound band is outputted from speakers. When resistances 2 and 3 are operated to raise the level of signals applied to speakers 9L and 9R superior in low band reproducing characteristic, capacitors C1 and C2 are cancelled, and rich low band reproducing characteristic, capacitors C1 and C2 are cancelled, and rich low band reproduced sound are always obtained. |
