With my M80s corner loaded as well as the sub, I get a tad boomy when I move the M80s to a 40hz XO or if I go full range, so I pretty much stick with them on small and a 60hz XO.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70