@atmasphere --
It sounds to me as if you are not familiar with the Swarm sub made by Audiokinesis. ...
Oh, I am, I simply made an attempt into outlining the possibilities of the horn sub route, and that it needn’t break the bank.
A DBA setup can be a great subs approach, no doubt. Different ways to skin your cat, as they say, and you could go all-out and make a horn sub DBA. I’ve heard a few of those.
Personally I favor a pair of symmetrically placed horn subs or other large high order bandpass variant. I’ve been given numerous long speeches on the supposed prowess of DBA - and it has its merits, for sure - but the proof is in the eating of the pudding, as they say. Not to imply all should feel the same way about that I do - on the contrary, actually - but simply that all mayn’t cry ’halleluja’ over the sonic outcome of the DBA approach, even after being preconditioned by theory.