Magnepan 3.6

Not realy 40 watts wont do the 3.6 justice.So many seem to want to try out SET but never use the right loudspeakers for SET. If SETs what you want get loudspeakers for it if you love your 3.6 get the right amp for them.

you should have no problem with an spl of less than 80 db.

i drive a pair of 1.6s with 4 watts. don't listen to the naysayers. try it and see. bring the amp to the speakers.
make sure the room is not much larger than your room.

It could work IF: The amp has great transformers and a strong power supply and you don't play the music much above 80db. Not all SET's are created equal.

I've heard 100 watt amps take a dump trying to drive my 3.6's. Even at lower levels it sounded anemic. My Bedini, at 45 watts, does fine. I also use an SET sometimes. It's an Art Audio Carissa Sig with 16 watts. It works great within its limits. Most people I have demoed my system for have preferred the Carissa to the others, of course, within its limits.

fwiw I ran 1.6s with a Stingray (50 watts) and it did a good job

"i drive a pair of 1.6s with 4 watts."

Four watts? If so, you are not hearing what the speakers can do. You may like it. I would hate it.