Well, here we go. I received a pair of these https://www.madisoundspeakerstore.com/ribbon-tweeters/audiopur-pla200-6-planar-ribbon-tweeter-200mm/
from Madisound and did some quickie measurements.
Pic #1 DATS measurement
Pic #2 FR and Dist graph front.
Pic #3 FR and Dist graph rear
Measurements on a 1.5' x 1.5' baffle @ 2.5' with arta.
............. could you hum a few bars.