In article , Phil
Allison scribeth thus
Trevor Wilson wrote:



**There's no such thing as a "full range driver", despite the clowns who
imagine a single driver can actually cover 20Hz ~ 20kHz with anything
approaching fidelity. I guess if the limits are +/-20dB.....


** The nearest thing ever made has to be the middle section of a Quad ESL63 or
any of its more recent offspring.

A single plastic diaphragm, driven as a series of concentric rings via a delay
line produces near perfect sound to beyond 20kHz - to a listener on axis of
course. Even produces accurate looking square waves at mid frequencies.



Don't they just! saw just that at the QUAD factory many years ago when
mine were being upgraded, a very square square wave indeed;!

Makes me wonder how any other speakers could do that as well?.

.... Phil

--
Tony Sayer