For historical context, the Ohm Walsh down firing drivers were some of the earliest "bending wave" drivers if not the first. There have also been other attempts at creating mega speakers from bending wave type of drivers like this one from Impact (long gone):
https://www.stereophile.com/floorloudspeakers/648/index.html
https://www.stereophile.com/floorloudspeakers/648/index.html