Certainly not anechoic measurements, but here you can see the in-room high frequency response of the Kii THREE and D&D 8c:
View attachment 23759
Red is Kii THREE and Green is D&D 8c, both left channel/speaker and measured at the LP some 3 meters away. Both make it past 20 kHz, which is a feat in of itself. 1/48th oct smoothing.
The Blue curve is the D&D at 30cm distance... Unfortunately, I did not take a near field measurement of the Kii THREE. But if you look at the roll off differences, and if I measured the Kii THREE at 30cm, I suspect it would be flat close to 25 kHz. Note my measurement microphone and calibration file is only for up to 20 kHz and have not measured this particular mic preamp. I know my Lynx Hilo ADC at 48 kHz sample rate is flat to 24 kHz as I have measured it. But really, if I wanted to measure past 20 kHz, an Earthworks mic would be required and a higher sample rate would be used (88.2 or 96 kHz) .
But what would be the point? None of us can hear past 20 kHz anyway, right? ;-)