I owned a Parasound A21+ to drive electrostatic speakers and was thinking of selling the speakers until luckily a potential buyer wanted to audition them with his amp. Suddenly I realized it was my amp. The parasound, and most high power amps, in my experience, does not perform well at low power.
The Pass and Coda you mention are in another class. I would expect the parasound to be a step down from your Rotel.
That is just my experience with one amp. Could have been made on a Monday I guess.
Your ML has active bass and doesn’t need a lot of power to drive it.
Jerry