SOLD iFi Audio Nano iGalvanic 3.0 Audiophile Grade Galvanic Isolation. £220 (RRP £379)
As new, tried once.
The iGalvanic3.0 is a ground-up design with full-galvanic isolation on USB3.0 and USB2.0.
I had a ground loop and suspected my server-DAC link was the culprit, but it proved not to be...