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Mintosh nor my marantz stack is anywhere near what I play with in my main system . This isn't a advertisement for the unit I have. Just to put that out there. My planars (Tympani I, mIIIa ,mgI ,mgII, mmg,mmgi) I have many I never really driven with them. McIntosh doesn't need me to speak for them...
However it can easily be done, magnepans are not hard to drive speakers aside from the low sensitivity. My infinity kappa 9 dips to 0.8ohm , it just needs a welder. And it's pretty rare , not many speakers out there that have such dips (Apogee scintilla, rs4.5 ) I think we can count them on one hand.
Anyways it's interesting and makes me want to venture a bit more into the vintage side again. Re capping is not hard on most equipment. And it seems more needed than I thought . I wonder how many here listen to inaccurate equipment, I bet many (vintage) lovers .