The converters by Audio-Gd.
The brand offers a range of DAC only for converting PCM and DSD digital audio files.
Three large families of very different converters chips are represented :
1. Texas Instruments PCM1704UK
2. ESS Sabre ES9018
3. Wolfson WM8741
Audio-Gd associate its converters with 3 variant Asynchronus USB interfaces :
1. VIA VT1731 ...
Prices are tax included