My opinion is that horns (generalization as I've not heard every horn made) sound best with tube outputs, due to their low power and roll-off. I really think they match well. It makes me wonder if the old horns were "tuned" to compliment the tube amps of the era. That would certainly make sense.
But, a powerful, clean, solid state amp and horns sounds over-bright and too "live" for me.
I auditioned a pair of Klipsch speakers ~25 years ago (floor standers- not sure of the model) and on "live" recordings, as in, live concerts that were recorded, they were awesome. Loved them. It was like being a member of the audience.
When I put in a studio recording, they really sounded too bright to me. Like over-emphasized in the midrange in particular. I really didn't care for them that way. Most of my records and CDs are studio recordings.
This test was "in-store" (Tweeter, Etc.) with their equipment and Copies of CDs they had on hand, that I was familiar with. I think the live one was SRV and the studio one was the Police. I was A-B ing them with a pair of Polk speakers (don't remember that model either, but floorstanding in a similar price bracket) and I preferred the Polks. I purchased neither.
I also auditioned (at a nicer stereo shop) a pair of electrostatics, and, in the sweet spot they were absolutely amazing. But, I need to wear a HANS device so my head does not move, because a small change in head position made a huge impact on the sound. Those don't fit my needs either. I think this was the same shop that sold Snell, and where I heard the C4s, in another listening room...
For me, dynamic speakers with a first-order crossover sound best. I had Vandersteen model 1's for several years which I eventually replaced with the Thiel 2.2s I have now. (wish I could listen to them!)