Turn your PC into an S/PDIF (BNC or RCA) output Digital Server. An affordable godsend for older Dacs with no USB (or quality converter) onboard :

“Back in early 2010, USB-to-S/PDIF converters for the masses were a bleeding-edge concern. Italy’s M2TECH changed all that when it introduced the hiFace, a US$185 Digital-audio interface not much larger than a standard USB thumb drive.

This nifty little device transforms one’s computer into a Digital-audio transport by giving users a simple and seamless way to deliver High-resolution music files from their computer to their playback system.

With the advent of the original hiFace, M2TECH effectively brought the benefits of USB data clocking out from the cold and into hands of computer audiophiles everywhere.

But clocking devices are as important as the DAC itself, particularly at the budget end of the DAC market, where sophisticated jitter-rejection circuits (found at the high-end) are precluded by the manufacturer’s intended street price”. Darko Audio

https://www.monoandstereo.com/2015/07/hiface-two-review.html

How M2Tech stormed the Audio World with the Original hiFace :

http://www.enjoythemusic.com/magazine/equipment/0210/m2tech_hiface_usb.htm

This listing provides BNC connection - RCA on request.

CSI : Acelec Engineering, Albedo Audio, DiDiT High-End, EVO 432, Final Touch Audio, M2Tech, M8Audio, Metrum Acoustics, Sonnet Digital Audio