most DAC/amps discussed here are pointless. They are solely good for engineering, not for practical use. for playback direct output from the headphone jacks of my macbook pro and iphones are already good enough --- amirm can test but I'm pretty confident they are good enough.Balanced DAC/amps are pointless. I might upgrade to a single ended D50/A50 if such a thing existed.
high resolution audio is only useful for recording, not for playback.