I also have MMi with the master RC networks. They sound incredible with my Black Ice Audio F35 integrated amp. I have a Legacy i.v2 Ultra class D amp which has not sounded bad with any speaker I've tried it on. Just haven't had a chance to try it with the Merlins.
Good luck. These are one of the all time great monitors. I have compared and prefer them to the current ATC SCM19 speakers, also very good monitors.