Node + Subwoofer + Active Speakers?

I have active Dynaudio Xeo speakers which have digital coaxial input and rca analog.

I also have active sub, which I do not use at the moment, but i would like to.

I am thinking about buying Node.

Can I connect Dynaudio via coaxial and sub via sub out? What about volume control then?

Or I have to us Node onboard dac and connect dynaudio via analog rca?