Sharing my experience with USB converters:
Using a 250 Pro CI and now 1000 Pro CI.
Started off with an Uptone ISO Regen (with Uptone LPS 1.2 power) to Singxer SU-1 (with external Uptone LPS 1.2 power). This did not necessarily sound better than Devialet AIR/UPNP (over WiFi). I had to do some tweaking of the device power supplies and grounding to get it to sound better vs AIR/UPNP.
I also use an ifi iDefender at the PC USB port to isolate the PC ground from USB chain.
After that, I upgraded the Singxer SU-1 to the newer Singxer SU-6. Still kept the ISO Regen. This is a step up and definitely better than AIR/UPNP.
Using a 250 Pro CI and now 1000 Pro CI.
Started off with an Uptone ISO Regen (with Uptone LPS 1.2 power) to Singxer SU-1 (with external Uptone LPS 1.2 power). This did not necessarily sound better than Devialet AIR/UPNP (over WiFi). I had to do some tweaking of the device power supplies and grounding to get it to sound better vs AIR/UPNP.
I also use an ifi iDefender at the PC USB port to isolate the PC ground from USB chain.
After that, I upgraded the Singxer SU-1 to the newer Singxer SU-6. Still kept the ISO Regen. This is a step up and definitely better than AIR/UPNP.
Devialet 1000 Pro CI - AQ Diamond AES RCA-XLR Link
PC - ifi iDefender+ - FIBBR Alpha Optical USB + "Studer 900" LPS - Singxer SU-6 - AQ Diamond AES
PSB Imagine T3 - AQ William Tell Zero / Tornado / DBS Level-X - PliXir Balanced AC