PlayBack Designs (guy involved in early DSD) uses a very high DSD sampling on their DACs. I think everything is done in DSD, including PCM data. The designer invented the first FPGA DAC, so it is some complex software implementation to do all of this DSD.
The new Schiit Yggdrasil+ Less Is More is my best DAC. The Schitt Mjolnir v3 (own it) is a good preamp and I think better than the Freya+ (sold it). I do not listen to the Mjolnir v3 all the time but when I do it is very enjoyable.