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  1. Tianming

    Noise isolation: Etymotic vs custom IEM

    Which provides better noise isolation, Etymotic with stock tips or custom IEM?
  2. Tianming

    Is this normal? 1x/3x O2 amp being very loud

    I got a 1x/3.3x gain O2 from JDS to use with HifimeDIY U2 DAC. I set my player volume and system volume both at 100% so that there isn't any dynamic range reduce due to digital volume control. The gain on O2 is set at low (1x). However the result is too loud. With my HD 558, the volume knob...
  3. Tianming

    For what headphone do I really need an amp?

    I have a HifimeDIY U2 USB DAC and Objective2 amp with 1x and 3x gain. My headphones are Sennheiser HD 558 and Beyerdynamic DT 880 PRO. With system volume and player volume both at 100% (0 db), and gain set at 1x on O2, it's way too loud on 558 unless the volume knob is turned very close to...
  4. Tianming

    USB DAC on Ubuntu Linux not as loud as on Windows

    I have a HifimeDIY U2 DAC (ES9023) and a laptop with Ubuntu 14.04 and Windows 8 dual boot. Through the same USB port, in Ubuntu, the volume out of the DAC is significantly quieter than in Windows. I don't worry a lot about the volume because I have an amp, but does this difference affects sound...
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