I use Unibox or Scan-Speak Toolbox but there are many good free softwares available.
There are many alignments with different F3, you don't need to stick to textbook alignments, F6 or F10 usually are more relevant if you use the speakers in a normal living room, mainly because of room gain.
The picture description clearly states that it "Follows the near field frequency band of the Audiotechnology C-Quence15h without filter."
Am I wrong in understanding this somehow?
And yes, depending on where and how steep you cross, you can get output down to 80Hz, even lower, from a midrange unit. I'm crossing a Satori MW13P at 220 Hz with a 12dB slope and there is output down to 60Hz.