It's dropping the fronts by 6dB at 63Hz likely because your listening position is close to a back wall about 9 or 10 feet from the speakers. This is creating a standing wave. A 6dB drop means the fronts are being fed 1/4 power at 63Hz. I'll bet if you disengage that filter, it will go boom boom in your room.

Last edited by Mojo; 10/28/19 06:43 PM.
House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated