That is exactly what I did. (Well I used 1800 Hz LR4.)
I bought several units of these as "defective", figuring that the defect is in the electronics and the drivers will be ok.
First I tried to reproduce the peaks and dips in midsummer (resonance?) but could not do it. Some hiccups (4 kHz) and hiccdowns (10.5 kHz) but not what Amir measured.
My measurements
orange: nearfield (1 cm) from woofer
with Umik in the living room (gated 6 ms) 25 cm distance
black: with grill
red: without grill (the grill/cloth seems to reduce treble quite a bit)
green: with front grill pulled out about 3 mm (there seem to be reflections)
View attachment 410186
blue: tweeter without grill, with Umik in the living room (gated 6 ms), 25 cm distance
black: woofer nearfield 1 cm, ungated, level adjusted
red: woofer 25 cm, ungated
orange: woofer 50 cm, ungated
View attachment 410187
Then I took off all the electronics (everything is nicely done with screws) and measured the drivers directly.
View attachment 410195
All the electronics inside. I only reused the white pin connector in the center to connect to the drivers.
I have an old Minidsp 2x4 that I use for EQ.
For aesthetic reasons I wanted to use the plastic panels but not accept the disadvantages.
I peeled off the cloth and cut out the grill for the tweeter.
Now it looks like this:
View attachment 410193
I might sand and paint it later. Still in progress.
This is the FR that I arrive at (gated again and without grill). In bass I adjusted for ≈60 Hz, - 3dB. But this works only for moderate levels of course.
View attachment 410189