Opinions on Full-Range/single driver speakers

Wonderful Electric you came to this conclusion after only hearing 1 pair of fullranges? And that one only used a wee driver and greatly over priced? Keep in mind many dont suffer so from the problems you list. The wee little wide bands dont have the range,dynamic range, mag power or cone area of the drivers were talking about. The f200a, SEAS X-1 do not need horn cabinets to produce bass so your reply[bass loading usually messes up the otherwise perfect impulse response] isnt a issue and they are in phase and a 4in will not do bass no mater what. Treble can be a problem the x1 and fostex do well but not as good as a raal or t500amk2 covering the same range. But you do win in intergration and point source, phase and time correct. No perfect transducer or loudspeaker since all are made by humans. We as designers work with compromises to bring the best sound we can for price range. Fullranges can make a wonderful loudspeaker but since only 1 driver cheaping out anywhere will be highly audible. But I find this to be true with most loudspeaker designs.

Great...thanks. You will now be forever bugged for your knowledge. Cheers.

Here at The Galileo Company (a research firm; we don't sell any audio equipment) we've designed systems (Wh3) to evaluate single drivers. You can see the systems here:
http://www.youtube.com/user/listiac
Over the past several years, we've evaluated quite a few single drivers. I can't publish our numerical results, but I'm allowed to give my own impressions:
My opinions change, but, as of tonight, my favorite all time single driver is the Altec 755C, built about 40 years ago. Some fanatics will pay $3000 a pair for Altec 755A's, but we can't afford them and haven't tested them.
Many of our listeners prefer the Fostex 200A. It's got great tonal balance, but our research with the Audio Nirvana super 8 cast frame has caused some of our best listeners to switch allegiances. The AN can seem thinner in the bass, but the clarity and imaging is quite special. The Fostex 206E is quite similar, and I'm not sure our listeners can distinguish them in a blind test.
We've tested many, many other speakers, but I don't want to speak disparagingly about any brand. Other speakers we like a lot are the JBL LE8T, the ElectroVoice SP8B, and the 8" Stephens, all over 40 years old. They have nice balance, good imaging, but not at the level of the Altecs, Audio Nirvanas and Fostex 200A and 206E.
We make measurements galore, but I'm not sure we know what to measure. Frequency response is only a very small part of the package. My best measure of a good speaker is that I listen to the music I'm using to test it. I know a speaker isn't very good when I keep switching songs and albums to find something that sounds great. I know I'm listening to a great speaker when I forget I'm testing the speaker and spend too much time listening to the music.
I also know now that a lot (most?) of high end audio is self hypnosis. Listening is the only cure.

Listiac ;
What cabinets were housing the Fostex 200 & 206e drivers ?

Thanks .

f200a and fe206 equal in performance? My findings are fe206e has +12db peak in responce from flat. If you like that great. I dont. Use a notch filter takes away the air. Using in front horn reduces peak to a small degree but still measurable and audible. To me fe206e is 1 of the worst sounding fostex I much perfer fe166e over fe206e but sure some are groving to the peaky responce of fe206e maybe the rise adds a bit of color that others like I dont know. But I will pass on fe206e.