The R2R decoding (DAC) architecture has been around for a few years (and, obviously, has nothing to share with the R2R group): https://www.hifireport.com/what-is-...-what-are-its-applications-in-the-hifi-field/ https://www.electronics-tutorials.ws/combination/r-2r-dac.html
It's a reference to the ladder network of resistances, with each lane outputing the appropriate voltage of each bit. It's kind of an obsolete technology in audio, delta-sigma DACs are way superior in both quality and cost effectiveness. But it's possible to make a good sounding R-2R DAC too, it's just more expensive. So it's not uncommon to see them in the hifi market as a lot of audiophiles who don't understand basic digital audio stuff want to stay away of delta-sigma DACs for some reason, and they also think that more expensive = better.
