Games for sure....That would be some insane output with SEVEN sets of those in the room, and yes all within 17ft of each other. Maybe we should scale that back to one driver be flanking sub......or not. ummm that would total 20 12" drivers in the room, wonder what kind of discount PE will give on that. HA!
When you do midrange horns you have to get even more finely balanced.
OK how to interpret the results.
I did the same manifold on all the horns. A square area 13" x 13" x 1". Lets you set your driver in place and gives you enough room for X-Mechanical. Personally I make a throat mounting plate. That is the 13" square piece with a hole cut out of it to accept the driver from the rear side of the plate. You can use screws if you are looking to save money. Number ten or twelve with a pilot hole the size of the screww shaft less the threads will help you get a good tight fit.
Again if you are on a budget. I have built many boxes out of OSB makes for a very strong box if you use the speaker builders secret weapon.
So you are doing offset horns. I designed the midbass so that the mouth could be done in a 15 inch wide enclosure. So if you do it with 1/2" material you are laughing.
The compression chamber is a part of the horn. You make the 13" x 13" x 1" box and cut out a hole the size of the S1 on this, and from here you start your horn. the hole is roughly 4 5/8" square.
Hornresp will give you inches on any hi-lighted number if you press F-6.
Nd is a field where you can change the number and position of the driver.
Switching the simulation to OD everything looks like it has gone down the toilet.
But worry not.
The way things work in real life on the low end only are not as bad as it may seem.
If you are at all worried, the way you make this completely to design is start off the horn with a square profile off of the manifold and expand until you are wide enough to support the height of the riser with the full width of the horn taking up all the space.
Again if these are buried under the riser OSB is plenty good enough. There are pictures on this website of a large scale horn I did out of 7/16" OSB that was strong enough for me to walk all over with no flex at all.
Bracing is your best friend no matter what you use for material.
And the secret weapon of the box builder is PL Premium.