Woofer slopes are similar, the lower driver adds snap to lower freqs. Let's take a look to the measurements, which come with the speakers. They probably need an amp capable of driving 2 Ohm load. Tube amps from the 4 Ohm tap do it well in my experience. Phase is surpisingly well mannered for this type of speaker.
Impulse response is very good, almost electrostatic-like, with very fast decay.
Waterfall shows a quick and even decay of stored energy, and indeed, these are very high resolution speakers. No box resonances occur. BUT these speakers come with a special placement recommendation called the RLX placement. And if arranged so, they get exactly the right sonic spot. Yes, they need a dedicated room for best performance.