That sounds good.
I remember speaking to Paul, a long time ago, somewhere between 1992-1995. He sent me his white papers and a little pocket knife. I had mentioned adding bass reflex to the Klipschorn and Lascala back then. He wasn't having it . With the more simple folded horn of the Jubilee I would think there would be less distortion and delay than a K-horn. It's interesting that the bass reflex tuned ports are entering into the horn bell, if I'm viewing the animation properly. I would have thought you'd get some cancellation, unless the bass produced by the ports is below the horn cutoff. I like the design, reminds me of concert level folded horns from the 30's and 70's, but with the addition of the bass reflex and DSP.