If I were you, i would stay away from metal cone drivers...... Look at that response, almost 20 dB difference between 4k and 10 kHz.. You must be a real expert in filter design to handle that kind of response.
Whatever you do with such kind of resonace peak, somehow it will always come through
For my ears, and taste the only metal cone driver equipped speakers that sound really good, are the Sonics Anima-s bx Joachim Gerhard (Ex- Audio Physics designer), but then again, it uses a custom made woofer by Seas, so it is not easy to reproduce.
Sonics Anima loudspeaker | Stereophile.com
Why would that be so?