@andybob is right we are saying the same thing. Poor phrasing on my part.
Perhaps I need to do more research on a separate preamp and DAC. Is there a list of DACs that work with Roon?.
All DACs should work with Roon but what i believe you aware intending from your questions is, is there a list of DAC that have Roon integration. From what i can tell there are two versions of this, Roon Ready and Roon Certified. Roon Ready is what you would be looking for as that is for network connections and uses the RAAT protocol, IE the Auralic Aries. RAAT doesn’t have the limitations of Airplay and would allow you to stream any format. I am not currently aware of a DAC/Preamp that is Roon Ready, (does the Aries Mini count?), but i do expect to see them.
Roon Certified is via a USB connection for DACs. See @Danny’s explaination Here
There isn’t a list that i am aware of at this point. All the information i have seen has been for snippets of show reports thus far. I would expect that to change soon as more products hit the shelves. Here are a couple of places to start your search from an article i posted a bit back:
Other manufacturers signing on for the RoonReady programme include Audio Alchemy, Bel Canto, Bryston, Cary Audio, Constellation Audio, dCS, Exasound, LH Labs, Lumin, PS Audio, SoTM, and TotalDAC
The above list also does not include ELAC which is using a modified version of Roon that is made for their products only.