gnostalgick
Border Patrol Dac
Looks like they also believe to get the best from pcm RedBook the way to go is with R2R Ladder Multibit conversion, not dsd's Delta Sigma
Here is an interesting review
https://parttimeaudiophile.com/2017/04/16/review-borderpatrol-usb-digital-to-analogue-converter-se-version/
Cheers George