Advice and help understanding, choosing a Widebander / Single Full Range Driver speaker?


I'm considering a second set of speakers for my primary system.

I'm satisfied and very happy with my current primary speakers (Tekton Design SEs), so this isn't about a replacement speaker, but I have been looking for something that is different enough from my Tektons, in terms of speaker type and design, etc.

My current top choices being Sound Labs or Cube Audio. Horns, maybe.

Srajan Ebaen's review of the Bliss C a year ago was what first exposed me to Cube Audio and his more recent review of the Nenuphar is stellar. Both reviews are copied in my follow-up post below.

I've been 'somewhat' exposed to full range drivers (or nearly so, with augmentation) as I've owned Zu Audio and Vaughn Loudspeakers and have been exposed to Teresonic speakers and Voxativ drivers. Still, I'm a neophyte with regards to this speaker type (single full-range driver).

Would love to learn more about the pros and cons of owning a true wide-bander and issues, pitfalls, etc. I should consider before moving forward.

Leaving this very general and open. Let's keep budget out of this also (I don't want to complicate the discussion). 

More on my system and room and preferences in subsequent posts.

Thanks!

(BTW - I did search the forums and there is 1 wide bander thread and 6 full range driver threads. None apply directly, but I will review each to see what I can pull out that may be relevant).
david_ten
The purist single driver is a dream, the have big  issues . If you ok 
without   super tweeter  , no whizzer cone. 10-12 khz is good enough.
. good without  good bass, or want to get sub, another big issues will
make sound  not good.   midbass lack, make sound thinner them need to be. i explain already in different treads,  -baffle  step https://www.trueaudio.com/st_diff1.htm
Midbass doesnt have to be thin. They do need a backloaded horn or transmission line for fuller sound. 

Where they actually lack is with complex music. Too much going on and they will trip over themselves.

With jazz, folk, girl and guitar, they are just about perfect. Add a SET amp, it is spooky real, band is playing in the room sounding.

But if you want a great all around jack of all trades master of none speaker that is also beautiful, buy the Sonus Faber speaker in your price range. 
With jazz, folk, girl and guitar, they are just about perfect. Add a SET amp, it is spooky real, band is playing in the room sounding.

@seanheis1 Thanks. What I am looking for!
I mean 250-400 Hz  , The deficit sound pressure make sound thin
Only real horn get big help  . transmission line working just for lower
bass.
I have had used full range speaker with 300B SET amplifiers for 4 years.

But it had lot of limitation in treble.

After I switch to Lansche 4.1, I had been happy with pristine treble that I can not get with full range.


https://www.audiogon.com/listings/lis96gda-lansche-audio-no-3-floorstanding-speaker-like-new-reduce-...

This one is smaller model than mine.

But you can experience excellent treble out of plasma tweeter.

It will be very good for Jazz Vocal.