Thank’s for the anwser.
So no regrets takings the M version to reproduce 40Hz/45Hz to 800Hz bandwith at 105dB/2.83volts/m, with lowest distorsions as possible, lowest damping as possible …
If the X version is as good as the M version until 800Hz, I prefer the model who have the better xmax !
Your conclusion will be my choice 😉 .
Thnak’s a lot for your kindness and your time.