[ubuntu] Bit-perfect audio on Ubuntu, USB DAC

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http://ubuntuforums.org – Hi, I am becoming an audiophile, slowly, step by step. I am considering buying an external digital-analog converter (DAC) to feed my studio headphones (AKG K271 mkII) with 24bit 192kHz/96kHz audio. After reading some reviews and taking a moment to think about the portability, I think I'm going for this. This should improve my music listening experience, as currently I am limited to the onboard audio. However, I have read about problems people have had setting up their USB DAC's on Ubuntu forums, e.g. here. My questions are: - How well does Ubuntu support USB DAC's? - Is Ubunt (Hardware)