Classé Delta PRE & MONO are much better than OK, but check also Pilium or Luxman C-900u & M-900u (or pair of M-900u)
You don't need that. Post #3 by Mr Peabody gave you the correct answer.
No need for dedicated sub output. Your preamp Main Output has XLR (balanced) outputs and RCA (unbalanced) outputs. Connect the XLR balanced outputs to your speakers and the RCA unbalanced outputs to...
Power cycle the whole network of devices starting from the router, including network switches, WiFi access points, Lumin, and Roon Server, iPad iPhone and Android phones. Make sure Lumin app...
Roon With D2