OK, thank you very much for your answers.
I just saw that the specificities of the M100 are the same as those of M80v3 on the site:

http://www.axiomaudio.com/m100-floorstanding-speakers # t-1

http://www.axiomaudio.com/m80-floorstanding-speakers # t-3

So, I think it is simply a mistake on the site (bad copy-paste?).
It is strange that the "new" M80v3 be as effective in the bass that M100!