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

Brownsfan makes a compelling point regarding Coincident speakers, very coherent. My Total Eclipse II is a big speaker(52"height and 170 pounds) 3 way design with 5 drivers. Despite this they disappear with most recordings.  You aren't visually drawn to them as the source of the sound. They create palpable images and stage and just get out of the way.

I've heard them in my room with about 6 different amplifiers and this vanishing ability is consistent with most recordings.  Some early stereo recordings do sound 'hard left and hard right'. Those are the exceptions.
Charles 

sometimes you can even hear the horn honk coloration on voices...I know some horns don't have this..

You are right- some horns don't have that at all. It all depends on how well the throat of the horn is designed; many don't have the benefit of computer optimization but some, like the Classic Audio Loudspeakers, do. This makes them very free of any 'traditional horn' artifacts. The Kapton surrounds help as well, since the driver won't break up if driven at too low a frequency.  Often you can't get away with a 6 db slope on a compression driver, but the Kapton surround allows for exactly that.
Take a look at some of the AV Showrooms videos on YT. Peter never seems to have any complaints about the Classic Audio Loudspeakers.

Charles1dad has given you a good list.
I have Horning Eufrodite Ellipse and think they check everything on your list.
The Classic Audio Loudspeakers are wonderful too.

What about Zu Audio speakers?

Full range, 12 ohm/100 db efficient or so, no crossover, fast, dynamic, hi res,
great soundstage, musical -- they design their speakers to revolve around the
naturalness of the human voice and "live" sound

I have a pair of the Bookshelf Zu’s, they are impressive.

The Soul Supremes and Druids are even more impressive,
they have the same to similar specs as above.

Order direct with 60 day trial and full refund available.
just sayin’