https://www.buchardtaudio.com/s400-detailed-description-1
This is a spin for the Buchardt S300, there are few noticable similarities in the measurments and I would go as far to guess that they have a very similar sound, except for maybe a little less energy in the 3khz region compared to the Elacs. The thing I don't understand is how a box speaker without any real waveguide could measure this well? There doesn't appear to be any bunching at the low end of the tweeters range (as seen in the above link), which is usually so common with flat baffle speakers. I've had a bunch of "hifi" speakers and many sound clear as a bell in the upper mids, and tend to be grating and maintain too much energy in that region throughout the off axis.