Originally Posted by Bassment
I still think you should do 4-8 large ported subs tuned at 14 ish. You don't need 150 dB, you can't even use that, you would literally rupture your ear drums. Even 130 db is crazy loud, well at least in the upper bass freqs, not so much at like 30 hz and down.
This is terrific advice. Very easy upgrade path there, simply add more.
You are talking about very lavish expenditures for this theater. Think about doing the same for the subs. Get good drivers, and add more when funding permits. If you are thinking of pushing inexpensive drivers to their limits, be ready for inexpensive driver distortion.
The uber-horn idea posted is novel, but completely untested and a one-off. That is a lot of unused space where multiple horns could be placed next to one another forming the riser and firing out by the back wall.
If horns will be your path, pick or create a design and use multiples. Using a different alignment for 'smoothing subs' is asking for trouble regardless of the DSP power on hand.
Designing, building and optimizing a horn is not a trivial exercise, and your first attempt WILL BE YOUR WORST. Guaranteed. HornResp makes it easy to get a pretty response, but making sure it will work at high SPL is a different story without building and testing, trashing, re-designing, building, testing, rinse and repeat. It is a long road, but I think worth it in the end, but you must have the time, and with 2 babies, that time will become more and more a precious commodity if you want them to know who you are.