Hi, I can only speak for the DCS Bartok (non-Apex)as someone has mentioned. I was becoming disillusioned with separates because you constantly upgrade with increasingly underwhelming results. I borrowed my friend's Bartok and it lifted my system to a new level completely. I bought it off him! - he then purchased the Rossini. I am very happy with it and it matches the rest of my system in price and performance.
I only listen to Qobuz, rest of my kit is; PS Audio BHK 300's monos, Kef Reference 5 speakers and I too have a pair of S812 subs.
I must add though that the Bartok does not have any RCA inputs
Hope this helps, good luck Mark