I believe the compression driver you show was used in the very first NVS Entity 1010's. Things changed a few years ago but those are a very strong driver.
When I built my own coaxial compression pro-audio tower setup I chose the phenolic drivers over the titanium. I find the phenolic drivers a bit more musical, but that's just me.
Newty/Guido, you might want to consider another source with a technical background. Maybe just call Eminence, they have great tech support, they were very helpful during the design of my system in 2005.
Here is a picture of my home brew pro-audio setup while I was experimenting with crossover settings (phasing and attenuation).