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I assume that's the midrange driver?
You assume wrong - it's for the whole speaker including the bass unit.
Passive crossover at 10k, your graphs show an issue at 10 and a bit?
Paul
Yes, it's comb filtering caused by lack of time alignment of the 435 with the supertweeter. The designer himself runs these without the supertweeter for that reason. Sadly Japan insists on them.
Strongly rising HF distortion? Ideal speakers for old people?
The rise in 2nd harmonic is due to the non-linear compression and rarefaction characteristics of air at high levels and is perfectly normal at over 100db AFAIK. It get's up to a whopping great 0.5% at one point. I wonder how bad the ATC's would be at those realistic levels?