I often questioned that also ,specially for movies. M22 and a sub I thought was better for movies. Specially when crossing over at 80 hz why bother with the M80 if 80hz and down is all for not.
I would rather goes nice great bookshelf and subs for movies and floorstanding for music. I am not that fond of subs for music. Maybe if I am into rap and that real heavy bass. But, I am more rock, jazz etc.
So, after years of explaining things from members of this forum, I have come to the conclusion that my M80's are used as a awesome bookshelf in movies. Then with music I have a seprate Blu-ray player and that channel is setup 2.ch no sub. Thens when I get to use the M80 as a floorstanding speaker.
I am now thinking I am going to one up in a few years to M80 HP v5 wink


Anthem MRX520
M5HPv4
VP160HPv4
QS10v4