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Agapeman
Nov 8, 2014
Mine arrived today as well. I hooked up a CD player using the line output, optical output and coaxial output so I could switch between them immediately. There was absolutely no hum on the headphone amplifier even with the volume turned all the way up. Mine is the stock unit. Switching between all the inputs yielded a most wonderful sound, of which I could not tell much difference. The headphones I used were a pair of Sennheiser HD 555's and a pair of Grado SR125i's. They both worked well with the headphone amp and the volume dial was around 11 for the loudness I liked best. I have yet to try the USB input, but I imagine it will work just as well. I also have yet to try it as a DAC in my sound system.
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