https://www.cnet.com/news/for-speakers-or-headphones-how-much-bass-is-enough/

The JL Audio Fathom f113 13.5-inch subwoofer.

Funny thing, for audiophiles, subwoofers were a no-no. They were too crude a device, or maybe the association with home theater was a turn-off -- subwoofers were rarely involved. That's changed somewhat over the years, but I still don't see too many high-end audio shops selling subs. They all sell big speakers, that's for sure!