Ivica, thank You for the input.
I have made compensation for the "hill" in 075 response. Those chinese diaphragms, do not match originals by any means, but they do the job good enough. They are not permanent solution, but for now...
Why I did not buy beyma and put the end to this? Because, I still have illusions about horn point source (without bass of course ). Show will go on.
I have a vision about one horn from approximately 500 Hz to 20 kHz (would settle for 800 Hz to 16 kHz). So, I have made a deal for two copies of 2360. Dimension wise they are very good, but they are made of more layers than originals, so they are thicker.
If I could afford, I would buy BMS 4590 and that would be it, but money is tight so let's play.
2445 with smooth titanium diaphragms can be made to play flat to 20 khz (I have done it already, but brake up mods at 6.5 kHz, 8 kHz, and 12 kHz, make sound very harsh. 2445 are good for use between 500 and 6 kHz.
I have also jbl 2426 I am going to ask local machinist to make me adapters from 2" to 1" throat, long 76mm. I am counting on response rise to about 3,5 kHz so quite attenuation will be required, and I plan to use that to set 800 Hz crossover point. If I could make 2426-2360 work from 800 Hz to 16 kHz I would be very happy.