Manny use Class A to their magnapans. With good results.
As the manufacturer says the important thing is:
Class A/B amplifier designs that come close to doubling power at 4 ohms have a long and successful track record.
https://www.magnepan.com/faq#receivers(And class A is always "on" and delivering)
I bought a pair to primarily have a total different type of speaker that i could switch back and forth between a panel and my box speaker.
It is a dedicated rather big 2ch listing space. With treated with thick absorberas and 2D diffusion behind the speakers all symmetrical. I am using a fairly near field setup there I am ~2m and sometimes closer distance from them (Not so much interaction with the room). Probably why I am happy with 5w class A. ;) I am primarily a sound stage guy.
The box speakers I upgraded with all bells and whistles that we don't even see on higher end speakers (with several thousands of dollars on their price tag).
Got the magnapan home set them up. No tweeks and just played some songs in standard configuration. And we're surprised that they sounded way better than my box speaker at this starting point!
My thoughts goes like this:
I thought that I had hifi and good sound. But the magnapan showed me that I were wrong and what good sound is really like!..
Today I know that my beloved box speakers will not be used again 🥲 that were I not prepared for at all. And I will never look at a box speakers in the same way as i have done previous.
When it comes to tweeks one that benefits LRS/MMGs is to rise them so that the middle of the driver is at ear level and in center of its directivity (probably more crucial when you are closer to them).
Easy to test just sit up on your knees at sweet spot and listening what happens when you lower yourself by lowering your rear end towards your heels so you sit down and are more in the middle of the driver.
You should hear a big improvement. Then it is easier to be motivated to rise them when what you will gain is more reviled.
Another tweek from the owner and manufacturer is to make sure that the left and right side of the panel is at equal distance to the listing position. When the tweeter is on one of the sides of the panel. Then it will bring the tweeter and woofer on the same parallel plane towards your sweet spot.
In other words if you have your panels parallel to the wall behind them then the arrival time will be different between the two drivers (again probably more important if you are like me rather close to them).
In conclusion if we do not sit far away with a reflective coffee table between sweet spot and the panels and other compromises in my opinion. Then you will find hifi nirvana with almost no effort even with the smallest panels. And my 5w/Ch shows that it is not about the power as such and it is more about doubling down than anything else.
