Finally, DAC9 review. However, the lack of Linux support is very disappointing. The RigiSystems USB interface will not work with Linux based products from Aurender, Auralic, Sonore, SOtM, etc... None of these devices work with the RigiSystems USB interface...OUCH!!!
https://www.computeraudiophile.com/ca/reviews/audio-research-dac-9-review-r644/
https://www.computeraudiophile.com/ca/reviews/audio-research-dac-9-review-r644/