Any experience with Arc ref75 driving magnepans

I think it would be great.
Folks always try to mention Maggies need a LOT of power. I think your Ref75 would have plenty to drive 3.7s in an average setting.
If you wanted max SPLs in a big room.. you would not even be asking..
So yeah i bet your ARC Ref75 would be capable enough.
I have Maggie 3.6s with a Bryston 4B-SST²
I play only at moderate volumes.. so my Bryston is total overkill.
(I may go to Magnepan 20.7s eventually.. Then the 4B-SST² might be getting a bit more work.)

I know someone who drives Apogee Duettas with the new Ref 75...he says it is an absolutely glorious amp in so many ways and handles them quite well. I would say if it drives them, it will drive your Maggies [as long as the room isn't especially large]. Good luck with it.

The Ref 75 is an excellent amplifier but not nearly enough power to drive those speakers correctly. Good Luck