Here is the spinorama for the JBL. A nice piece of work. On paper, the M100 doesn't look much different other than it will dig lower. An interesting decision by Harman to boost the response above 15KHz. Perhaps the engineers didn't have a choice.

[Linked Image from i.postimg.cc]

At 13 feet away, you'll be able to push the M100 to 105dBC peaks before you sense any distortion. With a sub, they'll hit over 109dBC cleanly. Not sure if the Denon can power them cleanly to those levels.

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