[S Clark]

My 15" woofer, the 416 16Z, doesn't even go that  low.  If I want anything below 50Hz, I use a sub.   I could probably get the  magnet "recharged" by Great Plains Audio, but it's fine for what it does.   

[Zuman]

Back in the late '70s/early '80s I ran the entertainment department of a theme park. Sound reinforcement was only just beginning to become based on real science and engineering, and I had difficulty getting budget approval for the equipment we really needed.
Fortunately, I had a small team of part-time, passionate college students and recent grads who were both knowledgeable and also really enjoyed making the most of what we could get, which was often used gear.
Our main stage featured four A7s, and we had great success upgrading them with TAD TD-2001s and TD-4001s for the highs.  Those TADs were just amazing at the time...nothing else came close.
We also had a large indoor dance floor that featured either 8 or 10 A7s (I don't remember which), lined up along the left and right perimeter of the floor, facing inward towards the center. It was, uh, "immersive."
Many bands that came to play at either the outdoor stage or the dance hall were skeptical when they first saw the A7s. They quickly realized, however, that the fidelity of our systems far outweighed what they were used to.

[Jon L]

Dang room bass node.  Moving the listening chair 3 feet hits a nasty bass null, and there is not much room to move the speakers instead.  Bass DSP correction can only partially mitigate this, so my optimal listening seat may not end up at triangle top between the two speakers 

[FullRangeMan]

If you want increase the bass add some carwood blanket 15 or 20 mm inside the enclosure, the 5 or 10mm dont works.
What stuffing you have now ?