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Quad ESL-2912 Electrostaic Louspeakers

The QUAD ESL-2912 is the latest audiophile class electrostatic speaker designs that fulfil Quad’s promise of “the closest approach to the original sound. The ESL2912's incorporate Quad’s classic push-pull technology which has led the field in electrostatic speaker design since 1957. The ESL-2912 represents the pinnacle of Quad’s achievements and incorporates enhancements in speaker dress, metal work, updated panels, 24K gold plated terminals, Piano Rosewood trim whilst retaining the original Quad philosophy.

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.

Model ESL-2912
Format Floor Standing Dipole with 3 degree Fixed Tilt
Type Multiple Electrostatic Drive Membranes
Time Delay Progressive Concentric Rings
Chassis Structure Heavy Duty Composite Aluminium Steel
Panel Elements 6
Maximum Output 2 N/m_ at 2m On Axis
Sensitivity 1.5mbar Per Volt Referred To 1m
(86 dB / 2.83V RMS Equivalent)
Impedance Variation 4-20 Ohms
Maximum Input Continuous Input Voltage (RMS): 10V
Programme Peak For Undistorted Output: 40V
Permitted Peak Input: 55V
Frequency Response 32Hz - 21kHz (-6dB)
28Hz - 21kHz (useable)
Distortion (100dB at 1m) Above 1000Hz 0.15%
Above 100Hz 0.5%
Above 50Hz 1.0%