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Quad ESL 2812 Electrostatic Loudspeakers
The Quad ESL-2812 is one of Quad’s latest reference Electrostatic loudspeakers and, like its predecessors, the ESL 2812 should be regarded amongst the finest loudspeakers in the world. Quad’s patented technology provides a unique combination of sonic speed and accuracy that is only possible from an electrostatic loudspeaker. With the imaging and sound staging realized by a theoretically ideal point source, alongside near perfect transparency and lack of coloration, they are without peer.
Why the Quad ESL is able to reproduce music with accuracy far in advance of any other loudspeaker? It is simply because the moving part of the Quad ESL, the electrostatic diaphragm, a thin layer of Mylar, ten times thinner than a human hair and so light that it approaches the mass of air to which it is coupled. As a result, there is no inertia inherent in the moving parts of the Quad ESL and the diaphragm is able to respond to the musical detail and transients with unparalleled precision. The Quad ESL is one of the few speakers that can reproduce a 1kHz squarewave precisely and cleanly.
To achieve this astonishing feat the Quad ESL uses a system of highly charged stator elements on either side of the diaphragm. This is coupled to a power supply that produces the necessary 5kV of EHT(Extra High Tension) charge that controls the diaphragm. How this extremely high voltage charge is produced and consistently maintained, at the diaphragm to stator interface, is the key to the low distortion of the ESL.
Attention is paid on the power supply section, especially the stators. Each stator consists of a layer of copper on a thin ,insulting backing which is punched with a pattern of holes to make it transparent to sound. The copper is etched to provide a conductive pattern which is necessary to re-create the point source attributes of the Quad ESL. After etching, the copper needs to insulated from the diaphragm, which will lie in close proximity to it.
In the 2812 and 2912, the insulation is created by a triple coating, utilizing a specific spraying technique. This perfected to avoid degradation of the EHT charge into close contact with the stator. These latest versions of Quad ESL, can thus play louder and handle more power than the previous models.
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