I have the DA2 in my C2700. It is incredibly good for the money, and I do not doubt that it will give Bartok a run for it. I would try a different DAC since the Bartok is highly overrated. The Bartok originally sold in the US for $13K and then rose to around $17K with no improvement in hardware other than software updates. Then, they add an additional circuit board and charge $$$ for the same case. Brilliant marketing!! BTW, I don't care for DCS; it presents as very sterile and non-musical. 
dCS Bartok Apex vs McIntosh DA2 - Trouble Hearing the Difference
I am currently playing a new set of Focal Scala Evos with a McIntosh MA9500, fed by a Wiim Pro playing Tidal Direct. This set up uses the McIntosh DA2, which sounds remarkable to my untrained ears.
I borrowed a dCS Bartok Apex from my local dealer. Given that I can run balanced out (using Transparent Reference Gen 6 cables) to the MA9500, I can switch inputs to compare the DA2 & Wiim vs the Bartok (DAC & Streaming) very quickly. I level matched the best I could.
What I am confused about, though, is just how close the DA2 sounds to the Bartok. The most noticeable difference is how forward and prevalent vocals are with the DA2. They seem anchored to the center image and several feet more forward into the room, whereas in the Bartok they are a bit more recessed, and integrated into the rest of the music. The Bartok soundstage is also wider, but not shockingly so. The sound is definitely smoother or "rounder" with the Bartok as compared to the DA2.
I admit I am relatively new to critical listening, but I think I expected the difference between the $20K Bartok and the built-in DA2 to be more profound. I'm not anxious to spend the money on the Bartok, but am willing to do if it is a significant step up, which I think it should be.
So what am I missing? Am I perhaps limited by the MA9500? My dealer doesn't love autoformer-based Mc products, but many do, so I would have thought the MA9500 is sufficiently resolving. Room acoustics are not the best, but certainly not terrible.
Interested in any thoughts or feedback.