Single driver full range speakers

“No One Person has been able to hear in use most of the Single Driver Speaker Designs that are in use” 

headphones? LOL 

Headphones, even though suggested as a Jest, the idea an individual has been able to experience all models since the 00's is a real challenge.

Speaker Types referenced in this thread have a History extending back to the 50's when they were in their Heyday.

I am able to listen to Tannoy Dual Concentrics from the 60's when a friend chooses to put them to use in place of their Quad 57's.  

 https://www.headphonezone.in/blogs/audiophile-101/evolution-of-headphones?srsltid=AfmBOoqgVb3So3SSwFaTUFXzbfTqF5opfNzu6Vm3TJJyxtAPf-TgcVvF                  

@tcutter please explain your point.. are you saying 2W/3W/4W/5W speakers are more accurate? agree on that, but 1W still has some advantages, such as x-over circuit impact on phase, damping factor etc.. 

@westcoastaudiophile 

My understanding is that the magic of an FRSD is due to direct coupling to the amplifier, thereby avoiding a crossover. A 2.5 way speaker that has a directly coupled midrange accomplishes the same goal but without the limitations of poorly matched and cobbled-together subwoofers and tweeters seemingly needed to extend the system’s range beyond it’s useable frequencies. If the single driver can reproduce all the frequencies to which one cares to listen, then your work is done. I just see a lot of these speakers that are supplemented by additional drivers, which begs the question as to whether or not they are full range, at least to some people.   

Along these lines, it may be that a multidriver system using an active crossover with amplifiers directly coupled to each driver may be the sweetest sound of all. The B&W Nautilus comes to mind.