Audyssey XT32 finds the low frequency cut-offs of my M5s, VP160v4 and QS10s to be 40Hz. I find I get the best music and movie performance when I set the M5s to 80Hz and leave the rest at 40Hz. This is by no means a knock on the M5s.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated