Single driver speakers. Are they worth considering ?


I don't mean electrostatic. How close to a full range speaker can you come with single driver ?
inna
There is coherency in single driver designs that eliminates quite a bit of IMD due to crossovers. A heated up crossover can cause compression, particularly the bass/midrange crossover, and bring a hard presentation if driven. I personally appreciate the immediacy of full range drivers. Dynamics are less affected and again, as a preference, dynamics are on my list of highly desirable characteristics. 
I guess one can tell I like to crank it!
Post removed 
@dentdog-    Intermodulation distortion is caused by drivers, trying to reproduce too many frequencies, at one time.     NOT, "...due to crossovers."       Dynamic/power compression is another subject altogether; again, not caused by the crossover, but- by overloaded drivers.     https://audioxpress.com/article/testing-loudspeakers-which-measurements-matter-part-2#:~:text=Interm....
For clarity: make that last sentence, "Compression (whether dynamic or power) is another subject altogether; again, not caused by the crossover, but- by overdriven/overloaded drivers."
Mark Audio makes some nice full range speakers.  The large metal drivers can suffer from cone brealup, but the paper ones not so much.  The Alpair 7 metal-cone driver in a "Pensil" MLTL enclosure can be quite musically satisfying.  Don't expect room-filling loud listening levels.  But in nearfield applications, say within 6 feet or so of the speakers with the speakers about 5 feet apart works very well.  Sharp dynamics, great image and soundstage, [obviously] great timing and coherence.  

So, yes.  Full range single drive systems can be quite good.