Thanks ifi.Yes, a PC/laptop to iGalvanic3.0 and then to micro iUSB3.0 and lastly your DAC, would be the best USB line we got.
Some users reported a quality spike in applying external 5V (from iDefender and ipower) before iGalvanic3.0, even though micro iUSB3.0 next in line is externally powered too. It's worth a shot.
iGalvanic3.0 provides galvanic isolation for USB, which is what iUSB3.0 doesn't do but benefits from. Think of the former as a product that prepares USB for micro iUSB3.0 to have it easier. But to make this to work the most efficiently, glavanic isolation has to be applied as soon in a setup as possible, and that's why we strongly suggest to use iGalvanic3.0 right next to your PC/laptop's USB out.
I totally agree that using better gears sooner gets better results. I previously tested that and got the same answer.
I used to have the micro iDSD BL but sold it as it was a bit fatigue sounding to me at the time (I do not have any USB solutions then), but now I realize that might be a issue of dirty digital signal.