Hi thank you very much again but i would like to elaborate a little my thinking
I promise i will not bother anyone anymore after this Last rambling
I see that at Neumann (but also in ATC) they rely on a "dome" solution for midrange in 3 way speakers and it is perfectly fine
Other brands like Genelec, PSI and Adam they usually adopt a cone mid
Let's take this model PSI Audio A25-M Studio
The mid is a 102mm cone
In the kh80/120/150 the woofer ranges from 4 to 6.5"
Why not see one of this model + the wonderful kh750 dsp as a 3 way in two pieces ?
you just need maybe an electronic crossover and some testing to find the best crossing point between the woofer and the 2 way working as satellite
And of course you have to decide where and how to place the 2 way units Not a big deal i guess given their small size and weight
Imho there are some benefits to keep the big woofer separated from the other drivers
Just transporting is much easier
Another one is to be able to mechanically decouple the vibrating bass from the mid and high unit
In passive speakers many designers have done this with great results
You can place the smaller units also directly on the sub box with some footers or spikes or other accessories that prevent the cabinet vibrations of the woofer from reaching the cabinet of the small speaker
I would not discount even the smaller and cheaper kh80 with an higher high pass of course