When I had M100s, my VP160 mounted me Onk and covered most of the ventilation grid. The Onk kept powering the M100s no problem. I even juiced the M100 with all she had and after my room stunk of scorched voice coil and broiled cross-over, the Onk finally self-protected.

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