Horn speakers , high efficiency but not “shouty”

Heresy IIIs with a well sorted tube festooned amp/preamp...no shout at all. This, however, was NOT the case with the IVs I recently owned although I'm not sure why that was. The IIIs have a completely different horn design which I seem to prefer.

I currently enjoying a set of Symphony   Horns by Auto-tech
My room size is very comparable to yours and these speakers have no issues  filling the room with amazing sound at low to extremely high volumes , without any hint of strain.
My mono blocks are only 20 watts per channel and its plenty of power which is a tremendous advantage if you like amp swapping.
This is the first set of speakers that Im not even looking to upgrade even though I had a chance to get the top model called the Universum MK4 .
As I upgraded my electronics the speakers responded to an amazing level and at that price point I feel these speakers are great value.
One other thing worth mentioning is the fit and finish is truly first class.

I have the similar size room 14' x 22' x 8' my 6 watt SET drives Altec 604E easily.
I'm sure even 2a3 or 45 SET will be enough!
I think the really sensitive horn speakers don't need more power for a such size room.

Dear @newtoncr : You own really good system with top analog rig and I read there what you posted:

""  Best sound I have ever heard, the ayre magico combo is magical and airy 😊.Been through many diff amplifiers and speakers but never have I heard a better combo.  ""

So, you are looking for something better ( I think? ) and just for curiosity: what's wrong with what you own?

A change of transducer always changes the " name of the game " and maybe what you are seen could sounds different but not necessary better and exist " thousands " of transducer alternatives that in true can outperforms what you own today. Just an opinion.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

@rauliruegas 
yes my main system is the best I have heard in the last 49 yrs . Heard many systems in diff homes, shows and in company showrooms .
the ayre and magicos are true magic . I love them . Took me nearly 20 years of trying out multiple components before I got to the combo I have .
The Charney speakers with tube pre and power amps built by him will be my second system. I have heard the diff flavor of the horns , they are different,  not better maybe not even as good ( yet to hear a horn system that sounds better than the magicos to me and that’s totally my ears ) . But horns offer something different esp in certain  recordings which I haven’t heard in box speakers or planar speakers. My second system is to fill that void , and like I told Brian Charney they won’t be competing with my main system, but will be complimenting my musical experience in my house .