Any updates on this, hvbias? The Klipsch jubilee is one of the speakers I'd really like to audition. Probably too big for my girlfriend and our living room, though. (edit: undoubtedly too big for my girlfriend)
One of the most impressive audio experiences of my life was listening to a DIY oversized horn system, also objectively designed. Made me understand that horns can sound really good if done well. The other commercial horn design I'm curious about, in addition to the Jubilee, is Danley SH-50.
I had a chance to hear them recently, thanks to a very generous member at the Klipsch forum (and survived a blizzard driving back!). This system is active crossover with EQ settings by the guy who designed the waveguide.
I was actively listening to see if there was any horn coloration (something I am pretty sensitive to) and I'm pleased to say I could not detect any whatsoever playing a wide variety of music, but focused more on jazz and classical.
I suppose the best thing I could say about them is that I forgot I was listening to speakers when I was playing my favorite jazz and classical selections. I was actively trying to listen for things I value and would focus on it but then later forget about it.
The dynamics are truly insane. And from that audition I'm convinced you need horn loaded bass to do it. No exaggeration or hyperbole when I saw it was the closest I have heard to my real life experiences with live classical (mostly NYPhil or BSO) or jazz.
A great Blue Note disc I enjoy-
The title track has some huge dynamics from the horns, drum kit, bass and piano. There is one section where the pianist goes up and down the keyboard then slams the piano and you can hear the decay and boxy resonation so clearly. I have never experienced this with my Quads or various Stax headphones.
Tonal response was completely even, essentially non colored from midbass up. As you can see in the picture below there is no room treatment or bass treatment so it wasn't easy to evaluate the bass. I think with an all out dallasjustice type of approach the bass performance could be real hifi.
Imaging (I made a thread about this a few months ago) was also surprisingly exceptional. This is one area I was expecting them to fall flat since most horns do, but YMMV as most of my experience is with the audiophool kind with multiple round beamy horns stacked on top of each other. On Oistrakh playing a Mozart violin concerto the various strings, and orchestra was so clear and well defined.
So tl;dr they went from speakers I'm considering, to moving up to the first position on the considering list.
I still want to look more into straight midbass horns, but from everything I heard yesterday my mind has sort of been swayed on folded horns.
If you get a chance to hear Bjorn's setup I am really interested to hear what you think.