Pdxwayne
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Hmm, if you are talking about the person who was going to return the x16, I also have such suspicion....But I am no expert...So, just suspicion about power, but is @gofry from UK?Could the fluctuations in uk mains voltage cause this? They are quite large, or maybe the regulation of the power supply per device? Non regulated would certainly be worse but even regulation has fluctuation doesnt it?
Also, as measured by me, voltages output when being fed -16db from REW, X16 has the lowest output as compared to E30 and KTB across all freq range. So if @gofry simply switch inputs when doing listening comparisons, without voltage/volume match, it is possible that when using Yamaha own DAC, it is louder, thus X16 seems less clear as comparison.
Edit:
Here is my measurement table. Again, my multi meter is not accurate. Just consistent and can show a trend.
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