@hilde45 You have given some great advice
@toontrader let’s circle back on your room dimensions. They could be a real challenge or you could do something really specia. The long wall may very well play into an outstanding fit for large Magnepans like the 3.7i and a sub(s), and something quite different on the narrow end, maybe British and more ’intimate’. KEF F, B&W amd Monitor Audio all offer excellent choices for that application. It really is a unique opportunity.
On the other hand, it think the room is just too long to be well served by a single pair of traditional cone speakers. Horns biggest benefit is controlled directives, which could make a very small listening window if used on the long wall. Cones might have broader coverage, but thats a lot of room volume for them to fill with the amps being mentioned.