Quite bad stuff...
The dip in the presence region is likely part of the bumps and dips to help compensate for the directivity issues. Kevlar is used in bullet proof jackets and the like because of it's high damping. Measurements of
a B&W midrange show a smooth extended high frequency response typical of a good soft cone driver. It wouldn't be possible to avoid strongly driving the resonances of a large hard cone crossed at a high frequency. The midrange driver itself is clearly well engineered but why the weird passband?
These measurements are from the B&W Silver Signature:
The Silver Signature's open architecture allowed me to take a look at the raw drive-unit responses without any crossover filters in the signal path.
The basic tweeter response is shown in fig.2: it both rolls out below 2kHz and shelves down by 4dB or so in the top audio octave before peaking at 27kHz.
The midrange and treble response of the unfiltered woofer is shown in fig.3.
A hint of a rising trend can be seen in the midrange, with then an impressively flat treble.
The steep rolloff above 7kHz is broken by peaks due to cone breakup modes.
Fig.2 B&W Silver Signature, quasi-anechoic response of raw tweeter (no crossover)
on tweeter axis at 45" and corrected for microphone response.
Fig.3 B&W Silver Signature, quasi-anechoic response of raw woofer (no crossover)
on tweeter axis at 45" and corrected for microphone response.
Fig.4 B&W Silver Signature, raw woofer cumulative spectral-decay plot at 45" (0.15ms risetime).
Fig.13 B&W Silver Signature, cumulative spectral-decay plot at 45" (0.15ms risetime).
The waterfall plot calculated from the impulse response is shown in fig.13.
A superbly clean decay overall is undoubtedly associated with the speaker's refined sound.
Note, however, the ridge parallel to the time axis associated with the on-axis peak at 3kHz.
Here's that pesky woofer-cone mode again.
https://www.stereophile.com/content/bw-john-bowers-silver-signature-loudspeaker-measurements