Wide dispersion + high efficiency + detail + coherence in a speaker?

As the OP goes:

...
Vandersteens have a tiny sweetspot
MBL are lifeless and are not coherent at all.
Ohms lack in dynamics and detail.

A rather unambiguous way of stressing the importance of efficiency (i.e.: liveliness and dynamics), as well as implicitly downplaying soundstaging/imaging (or aspects of it) compared to other traits - certainly if Vandersteen and MBL are anything to go by in this regard. Single-driver speakers are also mentioned by the OP, and so may point to a desired carrier of coherency here other than liveliness (coherency likely means different things to different people). Options may not be multiple, and some compromises are inevitably to be made. Nevertheless, should be a fun journey.

JBL 4319 monitors. Mine are still breaking in and are still amazing me. Not highly effecient (92db) but 6 ohm and they don’t have to be aimed directly at me to sound wonderful.

The highs can reproduce bells and chimes like they are in the room and have bass that can rattle my windows.

As for coherence and the ability to unravel the music, they can undo Gordian’s knot without slicing it in two.

All the best,
Nonoise

There are Tannoys that have all that, except maybe only moderate in dispersion (which aids efficiency and ease of integration into rooms)

You won’t sacrifice detail and clarity with OHMS if set up right. You will hear it all. There will be so much going on you will just have to decide what to focus on at any particular time, similar to a good live performance. They also compete in coherency with anything. Hence the name Walsh "coherent line source" driver.   Lots of bass.  There are even step up models with built in integrated powered subs if needed.     Set up right, the whole line sounds similar so if your room is small or you do not need the ultimate bass smaller less expensive models will do. 

When it comes to dispersion I think it's a question of whether the off axis response is just lower in volume or whether the off axis frequency response is bad.  When I think of bad dispersion I think of a speaker that has good on axis response but the off axis response is poor.  In cases like this you want to hear as little of the off-axis reflected sound as possible since it's messed up.  If the off-axis response is low in level but the frequency response is still good then I don't consider it bad dispersion.