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EDIT: Just curious, but does the amp use a stepped attenuator? If not, then how do you keep the left and right sides equal, I imagine you could drive yourself crazy trying to get them to sound the same.
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The amp has regular variable pots. Yes, it does drive me crazy sometimes, trying to get exact level matching. I keep volume fairly constant though, so it's not that huge of a problem.
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just curious; isn't it more logical if it comes with one volume knob and one flipping switch to turn it on?
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Since the amp is a dual mono (separate power supplies, separate gain stages) setup, the designer decided to highlight that fact with two switches and two pots.
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Various DACs were used. All these amp comparisons are relative and many people would not even be able to hear the difference. The choice of DAC has a far greater impact on the sound than the amp.
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We compared my Zhaolu D2C (CS chip, LM6172 opamps) with Philip's D2.5 (AD chip, Zapfilter out) and a DAC-AH (with passive bypass). The source definitely made the biggest changes. Which one was better? It's a matter of personal preference.