Then you have transmission line cabinets with single drivers that can go low. Sibelius is one such speaker. But yeah, it isn't for playing crazy loud. All speaker designs are compromises. I can't remember but Zu or Tekton have a two-driver speaker where the crossover is a very high 12KHz to the tweeter. So the woofer/mid is really doing about 95% of the work and most people on the high side of 60 probably can't even hear the tweeter much anyway.
Perplexed on how single driver speakers can cover such a large Hz range
I googled till I was blue in the face. I've always wondered how in the world the cone of a single driver speaker, with no crossovers, at any given ten thousands of a second, be vibrating a hefy 60Hz and also a sizzling 10 kHz. To me it's like quantum mechanics. I don't understand. I just have to accept.