the best digital coax 75 ohm with 4-6 shielded spif I found 2 coax cables inakustik Exzellenz with 2x2 shields https://in-akustik.com/digital-coaxial-cable-006044007par van den hul digi-coupler 6 shields https://www.vandenhul.com/product/the-digi-coupler-75-ohm-halogen-free/ why up to 6...

https://eu.mouser.com/new/analog-devices/adi-evaladum4165-evaladum4166-eval-boards/ for first adi-eval adum4165-eval adum4166-eval-boards/ just good optocouplers with real clock for jitter jitter is pushed to the bottom of the noise floor I don't know. There is no finished product with 4165-4166...

usb cable that has a tolerance of 2.5% 90ohm it is very important, in sound. so it doesn't matter, if it's silver cable or common cable. such a USB cable exists

modified singxer su2 The MagnaFied version of the very popular Singxer SU2 has upgraded OSCON Ultra low ESR caps, ELNA capacitors and WIMA film cap this cheap 489 euros plus shipping almost as good as kte su2 there is no power supply i use ifi xpower 5volt for singxer su2...