@regg This is one of the very first reviews on the AudioByte VOX. He has actually reviewed the HUB but I believe he could not publish it in Feb 2021. AudioByte likely asked him to hold of until they get the production issues sorted out (Covid related).
Audiobyte HydraVox 1-bit FPGA DAC Review - Hail Hydra! (soundnews.net)
Audiobyte HydraVox 1-bit FPGA DAC Review - Hail Hydra! (soundnews.net)