namefail said:
If the field of Single Driver Speakers includes super(?) tweeter and ribbon tweeters, would Tannoys dual concentric range not also have a look in?
I would say yes, in terms there is still not a crossover on the wide range driver and the tweeter is used to augument the driver, coming in 7-8kHz and above for example.
The main advantage of a wide range driver is keeping any crossover out of the critical area of the audio frequency, generally between 300Hz and 8kHz where the majority of the music is anyway. You do run into problems getting any decent depth in the bass out of a full-range driver without compromising either enclosure size (complex horns for example) or treble performance.
For Tannoys, no, they have a crossover so would come under a 2-way speaker, the only similarity is the point source design and possible phase advantages as well as driver integration (dispersion etc). This is coming from someone who has a had a few pairs of Tannoys too, currently playing with some older 10" versions.
In terms of drivers, there are loads. I have used some from Goodmans, Bandor, CSS, Fostex, Veravox, Omnes Audio as well as hearing some Seas, Audio Nirvana (clones) and Lowthers. There are heaps more that make full-range drivers too, too many to mention.