Single driver speakers. Are they worth considering ?

There appears to be confusion between full range single driver speakers versus Coaxial / dual-concentric driver speakers.

Tannoy is dual concentric and Kef employs a coincident driver. Both are examples of Coaxial speakers and both (examples given above) employ crossovers.

@james_edward  +1

I remember thinking- I’ll be damned if that doesn’t sound EXACTLY like a piano.

This is another coaxial speaker; there is an add on tweeter ("super-tweeter" per Zu). The main driver functions to slightly above 10KHz.

No crossover (though filters). Still not a true full range single driver speaker.

Zu make full range single driver speakers.