Hi Kodomo,
Thank you. I find your post very interesting. I have heard few horns and therefore have only 'some' understanding of them. But you have clearly spent a lot of time with them...and I would appreciate understanding what you look for in your system that is 'the opposite' in the Wilson/D'Agostino sound (which at least I am familiar with). Always here to learn...and particularly in the last year have enjoyed reading about horns here at WBF.
For reference, I have heard the Cessaro Betas + Horn Subs at Audio Exotics perhaps 10 years ago. I have heard the Cessaro Liszt here in the UK many years ago briefly. Perhaps the most mature system I have heard was the latest Avantgarde Trio with dual bass horns (driven by Emm Labs MTRX Reference Monos).
In terms of reference sound, my 2 favorite systems that I have heard are Ernie Lau's Rockport Arrakis system with VTL Siegfried II monos in Hong Kong and a much earlier generation of Audiocrack's system which used the Genesis Ones. Effortless, natural and a scale with nuance that was truly breathtaking to behold. They each made even big Wilsons feel more like Sashas. Just breathtaking...
In the case of horns, I noted an alacrity that was really special, but tonality was something with that ultimate instantaneous speed I sensed was very very difficult to control and get right. And so for some reason, I could not love the systems I heard. Equally, on all out propulsive power, I got effortlessly loud but not air-moving, chest pressure/compression of the air around me. Not sure why. But the AG Trios surely filled a very large room (45' by 30' or bigger and at least 10' ceilings) without any apparent effort.
Thanks for any guidance here as I learn more. (As mentioned elsewhere, I am looking forward to hearing the Destination Audio La Maltas which intuitively seems like an effortless horn that might also compress air given its bass driver design (31" cones).