I have two tapped horn subs. 2.4m long horn path.
Drivers are Eminence Kappa Pro LFIIs 15".
I use them sub 55Hz.
They play 18Hz 64ft organ music no problem. You feel that rather then hear it🙂
They are perfect.
Can be subtle, fast, loud, room shaking, whatever the music requires.
You do need to...