Fun? Sure. It is indeed fun to play with big speakers.
Direct-radiating bass reproduction is all about displacement, and the area of the piston (cone) is certainly a factor of that. More tends to be... well, more.
And this mysterious speaker (which there seems to be no color photos of, despite the 1981 date) has a radiating area of perhaps about 2 square meters.
That's around the same as qty. 18 of 18" woofers.
It's easy to find collections of way, way more than that. People even charge money to hear them; they're on the ground between the stage and the crowd barrier at any big rock show. :)
Resonance! Very minor earthquakes can knock picutures off the walls, items off the shelves etc. if they just happen to hit the right resonant frequency. So if you flood the area with 8Hz-ish acoustic energy, some stuff will start to shake.
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