Full Range Drivers

By one set of parameters your telephone is a full range driver. If you are looking for 20 to 20K range, you will not find a driver that can do it.
I use a horn with a compression driver that extends from 400 Hz. to 14Khz. Below that I have a 15 inch woofer which meets the horn at 400 and extends just below 50 Hz. Most guys on this forum would consider that unacceptably limited. I find that it covers most of the musical spectrum. At my age, high frequencies go to waste. The woofer delivers a sensuous, relaxed and accurate bass response so I'm happy.
What are you trying to learn? The advantage of a full range is no crossover. The disadvantage is compromised extension. Everything involves trade-offs and attendant choices.

I can't disagree. I've never heard one. I find your response appropriate considering the lack of information I provided. I'll try to see if I can demo some Tannoy's. I've heard that some full range driver configurations do a good job of reproducing vocals, I would imagine if implemented properly. I think my 3 ways do a good job, but have nothing to compare them too. I'm under the impression that no speaker does everything perfectly, so maybe I should look into having a second pair of speakers on hand for certain types of music. I'm probably crazy and just going through some weird 'collect bug'.

To get the most out of a single driver, you also need a huge, sometime elaborate enclosure.
And yes, the best can run some real $$$. But, given the generally high sensitivity you won't need a gigantic amp.

I have owned many speakers over many years and have enjoyed several single driver speakers including:
Beauhorns, Lamhorns and KCS seas exotics. None of these are full range in the sense of 20hz-20khz...not even close.
But depending on the room, positioning, music and personal tatse, I have found them all very satisfactory and satisfying...in fact, I would consider the KCS seas exotic to be one of the very best values I have come across.
I currently use Tonian Classic 12.1s which use the PHY driver covering most of the speakers usable range and the treble is brilliantly handled by the Raven 2 ribbon tweeter. This being second pair of Tonian speakers I have owned (original TLM-1s) and a very fine speaker IME.
I certainly like what a well designed single driver speaker can offer but like all speakers you have to pick your priorities and poison.

I ran Fostex Fe166 in a fostex BLH cabinet that I built for under $500 total, ran it with a Thorens TT, Bottlehead preamp and phono and Fi X 2a3 amp. It was one of the most enjoyable systems I owned. Very coherent, music that hangs in the air and very ballanced from 45 to 15k.

This is the system I most regret getting rid of in my search for the best. It was a 3K system that played music like an instrument and volcals like the singer was in my room