Aside from what's mentioned above, Aside from the book shelf and small monitor speakers, almost all the non-single driver speakers today are full range speakers
I hit enter key to fast the first time which I didn't finish my posting. I mean to say the second statement. However, the term becomes more weight when you talk about "single driver" speakers since majority are already full range speakers.
If you would consider coaxial speakers as single driver, then you'll have tons of this type of single driver full range speakers from vintage to modern. They sound extremely open and effortless except they're big. in cabinet size. Some fine coaxial speakers Tannoy : Vintage and modern Vintage Jensen Vintage EV Galante Audio
Yes, we're physically capable of 20 to 20k yet we don't hear the extremes often unless you have your system is hooked up to a frequency generator. I'm not sure what note you can hear at 20 hz but I only felt the "wind".
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