Horn Speaker Recommendations

Larger horn systems may be hard to blend into the decor of multi-use rooms and smaller rooms, but, they do not inherently sound out of place in small rooms.  To me, they are so much better than most speaker types as low volume that their biggest strength is playback at low volume in small venues.  Yes, they will do loud, but, they are even better at doing soft (they still sound alive).  Whether this is in the nature of the horns themselves, or the low-powered amps that can be used with these high efficiency speakers (I am guessing both are factors), it remains the case that it is somewhat harder to find non-horn based systems that are so lively at low volume (old quad 57 electrostatics come to mind as contenders).

Being a UK-based Wigwam scribe, have you by any chance listened to
Simon Mears Audio Uccello's?
Yes, they were at one of our annual enthusiasts' shows. I thought they were very good. Not as lively as the La Scalas and may be more suited to classical/jazz but still very much in the room.

Mr D...whoops overdone the enthusiasm. But I did like the speakers a lot and as they are hand made in the US thought the UK's cross Atlantic cousins may be interested.Speakers not for the chin-stroking studiers but they do make you want to get up and dance. And in my case, not a pretty sight but I did not care.

Some ideas about hybrids and other horn system, and coherence.

Almost every horn system have dynamics, and gives more "flesh and blood" than classical "box speakers".
but...
As said @mrdecibel, coherence is essential. To my opinion, THE point to accomplish when making a speaker. Coherent speaker are not so frequent , and coherent horn systems are...very rare :-D
Even if i do not close my eyes, i want to forget how many speakers/horns are playing. I want to hear musicians between the speakers, not treble / medium / bass horn

With any hybrid horn speaker, there is ALWAYS a mismatch. Even with the best (even those i made years ago :-D ), even perfectly crossed and time aligned, the mismatch is in dynamics behavior, or "speed" feeling, or tone. 
One can be easily blown away by his first listening experience with this kind of horn system. To be still in love with it weeks, months, and years later is another story !

About La Scala and comparable speakers : Properly used they can be enjoyable...well, exhilarating speakers ! They are very compact for their efficiency too, and affordable. Many good reasons to by and keep them...But  i am not found of the horn association : For me it is a bass horn with a medium horn. Who is supposed to reproduce the low mid ? male voices ? cello ? A 15" speaker cannot do that properly, moreover in a folded horn. An heavily truncated  500 Hz acoustical cutoff horn neither.

When testing a horn system, it is unnecessary to play "boom-boom-kss-kss" music (rock&roll, many jazz trio, and of course audiophile drum records) : this will be fun and probably good. Most of the problems will occur playing voices, or string quartet. Play them to point out mismatch between the horns, crossover issues, phase shift, blur in sound stage (when it is not image overlays :-D. )...

For all those reasons, when i do not listen a perfectly voiced full horn loaded system, i play a simple full range in open baffle.
For coherence :-D

Marc HENRY
https://www.kornhent.bzh

 Seems many who have a horn bias have never heard a proper set. Since many of the things, they insist all horns do I never hear out of a proper setup full front loaded horn system.  My horns systems disappear when on.                                                                                                         Music sounds real whole complete and in realistic space not emanating from a source. I don't get overly large image size I'm not limited in any way on music type or SPL even very low SPL. I can and do fit large horns in small and average spaces and get great results seems I'm not alone in that lookup Japanese horn systems. I can do that with almost any type of loudspeaker. I just don't get why simple system set up and synergy eludes so many in this hobby. Still, no-one can like all things we like what we like and this is a hobby so have at it and enjoy it.                                    But if you just are offended by the very idea of large loudspeakers you will most likely not enjoy a horn. If you enjoy massive SS amplification a horn might not be best.  But if you're looking for near realistic sound something you can use all day without fatigue ability to sound great at high or low-levels propulsive force= the feeling of wanting to move your body, visual appeal [subjective I know] but I do get many + comments on my many horns people like to touch them take pics etc not so much with my Harbeths-then a horn may well be worth considering.                           I mentioned before best to learn as much as you can before going horn because if you do it right it might be the last loudspeaker pair you buy since another benefit of horns is the don't go obsolete quickly can be upgraded repaired in the field. And many hold their value or even increase in such. Good luck.

  "Seems many who have a horn bias have never heard a proper set. Since many of the things, they insist all horns do I never hear out of a proper setup full front loaded horn system. My horns systems disappear when on.                                                                                                        Music sounds real whole complete and in realistic space not emanating from a source. I don't get overly large image size I'm not limited in any way on music type or SPL even very low SPL. I can and do fit large horns in small and average spaces and get great results seems I'm not alone in that lookup Japanese horn systems. I can do that with almost any type of loudspeaker. I just don't get why simple system set up and synergy eludes so many in this hobby."
  You are 100% right. When people start chiming in with things like Fortes when the OP asked for all horn systems you have to wonder what people even think all horn systems are.  Mine is a two way system that goes from 18khz to 27hz. The bass bin is a derivative of the MCM 1900 MWM modified to be deeper and taller and is 60" wide at the mouth and 60" deep and 106" of travel from the woofer cone to the mouth of the horn. The Klipsch 402 horn lens crosses over at 500hz and goes to 18khz. Center to center they are 17 feet and I sit back from them normally at 12 feet or so. By listening to what many have for room size this is not out of the norm. The DB meter tells me that my favorite level is generally around 80 so I don't have these things loud most of the time. But when I do it is chest thumping perfect fidelity that is possible only with a horn.
 These two ways just disappear and the sound quality will raise goose bumps on your arms at times and all you horn nay sayers just have no idea what you are missing. All these negative comments on horns just tell me there are a lot of people who simply have never heard a set but they can tell you all about what they can't or won't be able to do. Anyone near southern middle Tennessee is welcome to stop in and hear for yourself. PM me and we can go from there. Twist my arm real hard and i will stop my day to listen to music;)