There have been a couple here (I did look), but recent chatter in some other threads leads me to thinking about (electrical) "crossoverless" drivers -- extended range drivers, if you will.
"Fullrange drivers" -- well, that may be going a bit too far
Back when I first discovered SET amplifiers, I stumbled into Jamie Melhuish's fullrange driver site and forum. It was one of the first hifi fora I frequented, and it was a fun and informative one.
In those days (the end of the 20th Century!) there was a pocket of interest around some of the inexpenive extended range drivers (mostly twincones, mostly intended for car audio) sold at low prices by good old Radio Shack. Said drivers would periodically be available on sale for ca. half-price -- and, as they were ultimately closed out, one by one, the could be acquired very cheaply. To this day, I have a box containing an assortment of the fad R/S drivers of that era: 40-1197 (a Fostex FE-103 OEM variant), 40-1297, 40-1354 (still a personal fave), 40-1271, 40-1272, etc.)
Of course, there are also serious extended range drives, old (Lowther) and new (Lowther, Tang Band, Parts Express/Dayton, Mark Audio, etc.)