geoffkait, I understand that. But if you have a sealed sub on a slab, wouldn’t the "wobblyness" be counteractive to the woofer?
Yes. Exactly.
One thing you need to understand, you are taking advice from a self-proclaimed theoretical physicist, who designs interstellar rocket propulsion thrusters in his spare time and has a website devoted to flying saucers. His most impressive accomplishment is consistency: 21k posts, and not a one of them worth reading. Irrelevance on such a scale is remarkable even among audiophiles.
DYODD.