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發表於 2014-2-19 10:58:39
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本帖最後由 Audiophilelp 於 2014-2-19 11:34 編輯
唔明白有源同冇源。前級是否應該都有消減（attenuator）同放大，不然的話無源前級之是一個switch 同 attenuator.
另外DAC 做pre 直入後級，我聽過不少於三套不同中上價位DAC組合，真喺強差人意，當然DAC嘅attenuator 又唔同
又有friend 從來唔用前級，只有volume box,覺得用同廠有源前級沒有明顯分別。
真喺要高手師兄解答下！
找了自己用緊preamp設計師嘅comment:
" Could you not have used a passive preamp?
No, because a passive preamplifier always limits dynamics. An active one has more space, more weight, does not have to colour the signal and gives you more layers for the complete sound. The output stage of the preamp is equal to the input stage of the power amp. They match perfectly. In the preamp we do not use feedback and to lower the noise floor we use a pure differential circuit with bipolar transistors (not FETs) that is fully balanced. Although you can make use of single ended sources, the best way to use it is balanced only from the source. The gain is switchable between 6 dB and 12 dB. Again we made sure we have a large bandwidth, low distortion and low linear distortion."
Source : http://cms.the-ear.net/features/dan-dagostino
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