Thanks for the explanation, Frank.
If I did not have to have a remote, need to high pass my mains, and did not wish to connect my DAC via XLRs, the control amp would be a good option for me. One could argue that you would probably not notice a difference between RCA and balanced connections, but I like having the option. Having a Parasound P6 handle all that is like having a Swiss Army knife in the system. I do wonder what one of your preamps would sound like in its place, however, I'd have to account for a way to high pass my mains while sending the full signal to my MiniDSP 2x4HD which controls dual servo subs.