I am experimenting with B&G neo drivers myself.
I have pair each of neo3 and neo8s.
Lower mid is currently handled by a cone.
But I plan buying a pair of neo10 for next project.
Pairing neo10 with neo3,
best scenario is single neo10 (vertical) and neo3 (vertical).
Crossed over around 1500-1700 gives good horizontal dispersion.
Vertical dispersion not as good (neo10 already beaming at 1500).
Adding the second neo10 makes dispersion worse at all configurations.
I am talking minimal or no baffle.
http://www.diyaudio.com/forums/multi-way/175745-three-way-nude-swinging-dipole-thread.htmlAdd neo8s into the picture:
We can now cross at 1000-1200 and avoid beaming of neo10 on all axis.
Horizontal dipole radiation is now extended higher.
However, we are still left with the vertical beaming of neo8s, albeit at higher freq.
I think this is lesser of a devil and there are some mods to neo8s that can help.
I am experimenting with felt or foam acoustic lenses on neo8s.
These should help the vertical radiation, but I have no measurement capabilities to show that now.
I can report that my felt mods are very beneficial for taming the rising response and HF peak of neo8s.
With this mod, neo8s behaves very much like a compact MTM with neo3 in the middle.
Actually, it behaves better than a neo3 because my neo3 sounded more peaky even with EQ.
So IMO neo10 + modded neo8s combo can do without the addition of neo3 on top.
If more top end needed, I would add a cheap ribbon or amt supertweeter with a single cap.