I have a Chord mojo and a hifiberry dig+ pro. Before I was using a power bank, and there was a clear difference between coaxial and toslink, toslink sounded 3d but a little less decisive, and coaxial was more impactfull but 2d, now both inputs sound equally 3d, clearly there was some electrical noise coming through coaxial that affected the dac which by the way is not galvanically isolated and this psu solved the problem, I'm very happy with this result, in the future I plan on powering a Chord qutest and allo digione signature with this