I suggest you take Magnepan up on their trial offer.
I think the Adcom would be plenty to drive the MMGs or 12s, and long speaker cables shouldn't be a problem.
Getting room filling, speaker disappearing sound might be a challenge, but you won't know until you try.
It's been a while since I've owned them (MG12 and MG1.6), but I enjoyed the heck out of them while I did. Great speakers.
I think the Adcom would be plenty to drive the MMGs or 12s, and long speaker cables shouldn't be a problem.
Getting room filling, speaker disappearing sound might be a challenge, but you won't know until you try.
It's been a while since I've owned them (MG12 and MG1.6), but I enjoyed the heck out of them while I did. Great speakers.