Different power supply units leading to visible S/N ratio differences: Using the "Gain" optimization function in AnalogMagik, I measured the S/N numbers on iPhono 2 with its own switching-type PSU (Figure 1) and a large linear PSU by Acopian (Figure 2). The difference is about 1dB and quite consistent in various measurements.
AnalogMagik 有個原本用來找最佳放大倍率的功能,我以它測了不同電源供應給 iPhono 2 的 S/N (訊噪)比。圖一是原廠的切換式電源,圖二是 Acopian 的線性電源。測出的差別不大,約1 dB左右,但數據相當的 consistent。
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