Ummmm. Where to start...?
Obviously I never heard this room but:
"TOTAL LENGHT OF THE HORN is roughly 9,3 + 2,7 + 6 + 2,5= 20, 5 meters" according to that website....but everything after the 9.3m is room loading, pretty much any of the 1st couple boundaries it hit is an extension of the horn path according to these guys. BTW THT is about 4 meter path so you get about 1/2 the path in a nice 3 foot cube if you want, then just measure all your walls. Or a pair of Tuba 96s should be close depending on the folds.
Is it me or is it interesting there is no acoustical measurements of this room posted in the article? Just we went nuts and here is what we made!
LelandCrooks wrote:1.2 gigawatts

Duh you need that to power the flux capacitor in the "SUBATOMIC PARTICLE ACCELERATOR" oh wait I mixed up my 80's movies, I knew that sounded familiar...
Thank you wiki:
The Proton Pack, designed by Dr. Egon Spengler, is a man-portable
particle accelerator system that is used to create a charged particle beam - composed of protons - that is fired by the proton gun (also referred to as the "neutrona wand"). "
unlicensed nuclear accelerators" ~Egon
Guess they didn't get the memo about mixing horn types and phase issues either with their 18 Laura's including the horn flair surrounds of the mains. Flair. I think Joanna only had 15 pieces of flair, the bare minimum. Not like Brian over there he has 37 pieces
Second to last....Why must people insist on putting instruments and other crap in their listening rooms and theaters. If you are going to put all the time, effort, and money into this room to make it as acoustically perfect as you can imagine, why put a drum set and guitars in there? It is a listening room not a studio, if you afford this room you can afford a studio next to it or something. Or do what I did in high school, if I wanted music to sound better than my system would allow I bought some magic brownies. Then you forgot about the system and concentrated on the music.

Way easier than tweaking out a system then throwing in random objects.
"An error normally made is to consider the speaker by itself (or the amp or the cable). There is people that do not sleep at night because still is not satisfied of what he has made or bought. The final result of an audio system is proportional not to the money spent to make it, but to the amount of thinking and research one does consider from the start as the all lot of components he must at the end stuck together. As normally HI-END Audio manufactures do not provide everything and people likes to put "this" connected to "that" because " have read here and there" or "heard from somewhere else" still the problem to get a very good final result is far away to achieve.
Many times to build bass horns everybody follows manual and books (and thats good to do, theory always teaches, experience is something else), we also have books but experience is much more worth and in this case the horn MUST not be seen by itself.
Talking about a BIG HORN SUBWOOFER there is something that I think people normally forget or do not take into consideration (and maybe books do not explain) that is the dimension of the room and the position of the horn mouths toward the listening point plus the shape of the room. The second thing is that the bass or sub horn calculations are normally valid (as usual) in open air and that the room itself, if correctly used and shaped, can be considered part of the total horn below frequencies as 20 Hz."
All from the website, Wow an entire 3 paragraphs from that site that sounds eerily familiar.
/dismounting from my soap box. Thank you all for your time.