收了台Cello Encore 1MΩ前级，唱放部分一声道有三组调整，后面一组应该是调输出db的，前面平排两组不知道是调什么，哪位大侠知道请不吝赐教。感恩！

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没玩过cello的猜测是不是三级增益，第一级确认mc mm，第二级XXX，第三极RIAA增益，三组加起来的调整是最后的总增益多少个db，瞎猜的

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设定请参考厂家的手册：

Unless ordered otherwise, switch settings are factory set as follows:
Phone: 60dB,1KΩ input impedance
Balanced Line Input: 6dB gain,1MΩ input impedance (+)
Consult the diagrams on pages A1 and A2 for proper settings of switches located inside the Encore 1MΩ Preamplifier.

Page A1:
BALANCE LINE INPUT (ONE CHANNEL)
SW3:
1 on , 2 off (+) input impedance :10 KΩ; Gain: 0 dB, (-) input impedance :10 KΩ
1 off , 2 off (+) input impedance :1MΩ; Gain:7 dB, (-) input impedance :10 KΩ
1 on , 2 on (+) input impedance :10 KΩ; Gain:+12 dB, (-) input impedance :1 KΩ
1 off , 2 on (+) input impedance :1MΩ; Gain:+18 dB, (-) input impedance :1 KΩ
Note:
For unbalanced sources set switches 1 & 2 to off.
For balanced sources set switches 1 on & 2 off.

Page A2:
PHONE (ONE CHANNEL)
SW1:
1 off , 2 off Gain: 36 dB,
1 on , 2 off Gain: 47 dB,
1 on , 2 on Gain: 60 dB,
SW2:
1 off , 2 off 50K/220pf,
1 on , 2 off 10K/220pf,
1 off , 2 on 1K/0.01uf,
  

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    感谢大侠

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    感谢提供思路

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    感谢前辈提供的详尽资料，我按这个调看看。感谢王先生，感恩！

奇怪，只有
PHONE (ONE CHANNEL)
SW1:
1 off , 2 off Gain: 36 dB,
1 on , 2 off Gain: 47 dB,
1 on , 2 on Gain: 60 dB,
输出的声压有效果，其他的听不出来