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That behaviour (flat treble measured close but peak at 12 kHz mid-field, dip at crossover) reminds me a lot of the Epos K3. As a matter of fact, the crossover was bad: the tweeter rolled off with a -6db filter at 3 kHz, and there was no low-pass for the mid. Phase was strange.Interestingly the nearfield measurement does not seem to show that peak. In fact it is quite smooth.
I guess that tweeter is not padded down at all (never would be designed that way on purpose)and is out of phase with the mid. That would explain both the dip before crossover and the insane peak.
In other words bad crossover. That would also explain the shutdown. Though I would think the issues would have been shutting down the testing amps as well and showing in the impedance plots.
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