What are "Full range speaker"

Some fine single drivers
Western Electric/Altec 756a and 728b
AER drivers
Lowther drivers

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.