Rotel 1052 and magnepan MMG

Just contact Rotel and ask them. The rule of thumb is if it doesn't say 4 ohms it will have difficulties driving a true 4 ohm source. This being their top of the line model at one point it is possible that it will. Or just send them an email.

I have contacted Rotel on the 4 ohm issue. No sweat
in using 4 ohm speakers. This was with a 1552 amp.

I used to drive my SMGc's with a Rotel 60W integrated. No problem going plenty loud, but the problem is that the dynamics were very compressed, which took a lot of excitement out of the listening experience. Small Maggie's need at least 100W of high-current power to get good dynamics.