karurravi
I’ve heard most of the Belcanto Class-D’s, only one that made me think of going to the "dark side" was the 600M monoblocks, BUT!!! only when they drive a nice benign 4-8ohms impedance through the mids and highs with no nasty -phase angles involved, only then these amps to me stayed sweet and airy.
Fortunately your Dynaudio C4’s are right your the alley, and should sound great with these monoblocks.
https://www.stereophile.com/images/archivesart/DynConfFig1.jpg
Just make sure the bass around 70-80hz is good with them also as
"Quote Stereophile measurements: -46 degrees -phase angle and 5.1 ohms at 73Hz will rule out the use of amplifiers that are not happy with low impedances."
This EPDR could look to the amp as a load below 3ohms, even 2ohms.
As for the Rogue RP5 Pre-amp, it’s output impedance is 500ohm, no problem with the 100kohm input impedance of the 600M’s. And the gains of both are a good match also being a low 10db for the RP5 and medium 27db for the 600M’s
Cheers George