I was listening yesterday to the Cambridge DacMagic connected to my HP2133 via USB. The sound quality was really unpleasant: especially in the treble where it was very splashy and relentless. I then connected the DacMagic via an optical isolating USB hub. Not a practical solution, as the hub which is designed more for medical applications, is more expensive than the Cambridge. I won’t say the music was transformed into something truly audiophile but it was significantly better.
