Picked up the Founter 100Fs this morning.
Set them up and took a measurement at the central listening position with no subs or EQ active:
Reference level was 75db and they're hitting 35Hz in room at that with room gain. 27Hz at -6 from the reference level. The room is doing it's usual funky stuff with the 70-300 range.
I don't think I'm going to bother applying EQ over 500 Hz on these.
Sadly, where my old studios just powered through the low end, these do not and exposed a nasty null/cancellation in the low 20s that I will probably have to try an move the sub to fix. Might have invest in a wireless transmitter to try positions across the room.