What are "Full range speaker"

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

The Loth looks interesting, but I notice it only goes down to 24Hz and there's no +/- qualification on that spec.

I'm not saying that there aren't some very fine single driver cone speakers, but they aren't full range.

Onhwy61, your ear can't even hear things below 45 hz so I don't know what's your arguement.
AER is 20hz to 21Khz

S23chang, where did you get that figure from? Sources I know of say 20hz is the human low range limit.

My speakers do -1+1db sub 20hz to beyond 20khz. But then, they are three way.

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".

Happy listening