{"product_id":"quad-esl-2912x-flagship-six-panel-electrostatic-floor-standing-loudspeaker-each","title":"Quad ESL 2912X flagship six-panel electrostatic floor-standing loudspeaker (Each)","description":"\u003cp\u003eThe Beginning\u003cbr\u003eThe ESL-X concept began in 2019 as part of an intensive review of the QUAD Electrostatic manufacturing facility—a suite dedicated solely to the production of QUAD ESL loudspeakers. Under the expert leadership of Paul McConville, (a gentleman recognised as the world’s foremost authority in QUAD ESL engineering, with 40 years of experience), every aspect of the original design underwent a comprehensive evaluation and meticulous refinement.\u003cbr\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0806\/9500\/1374\/files\/ESL_X_1.1.1.webp?v=1790932379\" alt=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis approach encompassed a thorough analysis of every process, step, technique, material, tool, and jig employed in the construction of a QUAD ESL, with the aim of improving the quality and precision of the electrostatic loudspeaker assembly.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cspan\u003eLeveraging techniques such as advanced laser-precision metrology, QUAD undertook an exhaustive review of the foundation of the ESL design. Systematic enhancements were implemented in the processes of spraying, etching, tensioning, and assembly to ensure peak performance. Rigorous upgrades were applied to implement both passive and active components, enhancing the overall system integrity of the then-current ESL 2912 and 2812 models.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0806\/9500\/1374\/files\/ESL-2912X-Artistic-Black-_5_1.webp?v=1790932422\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe team of QUAD engineers considered the results of this lengthy and time-consuming self-appointed audit so significant that they deemed it worthy of a new model in the lineage of the ESL programme.\u003cbr\u003e\u003cbr\u003eIt is widely accepted that enhancing an ESL is fundamentally an exercise in building upon existing frameworks through incremental improvements rather than pursuing radical innovations. Consequently, QUAD did not require a complete overhaul of established methods. Nonetheless, these incremental advancements have now culminated in a significant transformation of the 2912 and 2812 models into what is now known as ESL X.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe History\u003cbr\u003eIn 1957, QUAD founder Peter Walker shattered conventions with the introduction of the first full-range electrostatic loudspeaker, achieving transient response and clarity then considered impossible.\u003c\/p\u003e\n\u003cp\u003eSubsequent models (ESL-63, ESL988\/989, ESL 2805\/2905, ESL 2812\/2912) each introduced incremental refinements. Critics have long hailed these models for their airy, effortless midrange and natural box-less hear-through qualities.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0806\/9500\/1374\/files\/ESL-2912X-Artistic-Black-_5_1_4dda159d-13bc-4510-a5df-e743926e8764.webp?v=1790932465\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe Heart\u003cbr\u003eOne would be rightly forgiven for knowing of the ESL but not knowing how the ESL differs from typical loudspeakers. It us correct to begin with the fact that a QUAD ESL is not your typical loudspeaker! Unlike conventional speakers that use moving-coil drivers, the ESL employs a completely different principle: an electrostatic panel.\u003c\/p\u003e\n\u003cp\u003eAt the heart of a QUAD ESL are panels containing a diaphragm of fine Mylar film, ten times thinner than a human hair. The Mylar film is coated with a high resistance conductive material and suspended between two perforated metal plates called stators.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0806\/9500\/1374\/files\/ESL_X_7_1.jpg?v=1790932509\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis unique diaphragm is incredibly light and therefore dynamically responsive. It is much lighter than any moving-coil driver cone and can therefore respond to signal transients with incredible speed and accuracy.\u003cbr\u003e\u003cbr\u003eThe Mylar diaphragm is charged up to a constant high voltage exceeding 5.2kV DC. An audio signal is applied across to the two stators to create an alternating electric field, which causes the charged electrostatic Mylar diaphragm to be alternativley pushed and pulled towards them. As a result, the diaphragm vibrates accurately in response to the music signal, and so produces the ultra-pure sound reproduction for which QUAD ESL loudspeakers are well-known.\u003cbr\u003e\u003cbr\u003eDue to the diaphragm's lightweight nature and uniform drive across its entire surface, the sound it generates is exceptionally clean, responding accurately to musical transients, and exceptionally low in distortion, particularly intermodulation distortion. This is particularly evident in the midrange frequencies, where human hearing is most attuned.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0806\/9500\/1374\/files\/ESL_X_1_345dd403-42f6-42b4-9a8e-8c2773a8be67_1.webp?v=1790932623\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e“Point Source” Design\u003cbr\u003eQUAD's ESL mid-high frequency panels are configured with a \"concentric ring” electrode design, initially conceived for the ground-breaking ESL-63. Rather than allowing all sections of the diaphragm to move uniformly, the speaker is meticulously engineered to ensure that the audio signal seems to emanate from a singular point in space. This sophisticated arrangement produces an exceptionally precise stereo image, wherein instruments and vocal performances appear to hover within the auditory environment — akin to being enveloped by the musicians themselves. This point-source characteristic is expertly facilitated by an innovative delay line system, which supplies the outer rings of the stators with gradually delayed iterations of the audio signal.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0806\/9500\/1374\/files\/EHT_Voltage_Multiplier_PCB_1.webp?v=1790932652\" alt=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eHigh Voltage \u0026amp; Low Distortion\u003cbr\u003eOne critical factor influencing the ESL’s performance is its notably high operating voltage – approximately 5,250 volts. This elevated voltage substantially enhances the diaphragm's control and linearity, allowing it to move with precision in response to musical signals while significantly reducing distortion.\u003c\/p\u003e\n\u003cp\u003eA QUAD ESL rigorously regulates this high voltage via a multiplier circuit that amplifies standard AC power, complemented by a protective circuit designed to prevent overdriving (excessive input power), thereby safeguarding the speaker from potential damage and distortion.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0806\/9500\/1374\/files\/ESL_PCBs_5d3fde72-c4ac-496e-8dc4-e80c0cf5475d_1.webp?v=1790932685\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003eThe Improvements\u003cbr\u003eThe intricate details of the manufacturing process contribute significantly to the refinements that are more than audible in the ESL X. For one, the time taken to manufacture a single QUAD ESL panel is extended, therefore the time frame for a full ESL loudspeaker system to be assembled is much more considered. The process is one of extreme care and attention to detail.\u003c\/p\u003e\n\u003cp\u003eHowever, dig even deeper and QUAD engineers have taken things to the ‘X level’ with some intriguing further enhancements.\u003c\/p\u003e\n\u003cp\u003eMajor upgrades\u003cbr\u003eThe first technical improvement sees the operational PCB split from a monolithic design into three fully independent modules. The system comprises a High-Voltage Multiplier Module, a Control and Protection Module, and a Low-Voltage Signal Module. Together, these components form an integrated unit designed for optimal performance and reliability. By physically segregating the 5.25 kV multiplier stage from the sensitive low-voltage circuits, QUAD significantly diminish stray high-voltage electric fields. This isolation strategy not only minimises interference and crosstalk but also markedly enhances stability and noise performance. The resulting effect is crystal-clear audio signals that faithfully reveal every nuance, even during powerful musical peaks.\u003c\/p\u003e\n\u003cp\u003eSpecifications\u003c\/p\u003e\n\u003ctable class=\"product-specifications-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eModel\u003c\/td\u003e\n\u003ctd\u003eESL 2912X\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFormat\u003c\/td\u003e\n\u003ctd\u003eFloor standing dipole with 3° fixed tilt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eType\u003c\/td\u003e\n\u003ctd\u003eMultiple electrostatic drive membranes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePoint Source Time Delay\u003c\/td\u003e\n\u003ctd\u003eProgressive concentric rings\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChassis Structure\u003c\/td\u003e\n\u003ctd\u003eHeavy duty composite aluminium \/ steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePanel Elements\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Output\u003c\/td\u003e\n\u003ctd\u003e2 N \/ m2 at 2m on axis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensitivity\u003c\/td\u003e\n\u003ctd\u003e1.5 mbar per volt referred to 1m\u003cbr\u003e(86dB\/2.83V rms equivalent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal Impedance\u003c\/td\u003e\n\u003ctd\u003e8 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eImpedance Variation\u003c\/td\u003e\n\u003ctd\u003e4 - 20 Ohms\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Input\u003c\/td\u003e\n\u003ctd\u003eContinuous input voltage (rms):\u003cbr\u003e10V Programme Peak for undistorted output: 40V\u003cbr\u003ePermitted peak input: 55V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e32Hz - 21kHz (-6dB)\u003cbr\u003e28Hz - 23kHz (useable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDirectivity Index\u003c\/td\u003e\n\u003ctd\u003eSee Polar Diagrams\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDistortion (100dB @ 1m)\u003c\/td\u003e\n\u003ctd\u003eAbove 1000Hz \u0026lt;0.15%\u003cbr\u003eAbove 100Hz \u0026lt;0.5%\u003cbr\u003eAbove 50Hz \u0026lt;1.0%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAC Input\u003c\/td\u003e\n\u003ctd\u003e220 - 240V, 100-120V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Fuse\u003c\/td\u003e\n\u003ctd\u003e100mA anti-surge, 200 - 240V\u003cbr\u003e200mA anti-surge, 100 - 120V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e8W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (H x W x D)\u003c\/td\u003e\n\u003ctd\u003e1470 x 690 x 380 (mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e44kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Quad","offers":[{"title":"Default Title","offer_id":60102998786334,"sku":"ESL 2912x","price":265990.0,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0806\/9500\/1374\/files\/1_b21a779b-0143-4046-bfa6-b2774ca1264d.png?v=1790932870","url":"https:\/\/www.e-piphany.co.za\/products\/quad-esl-2912x-flagship-six-panel-electrostatic-floor-standing-loudspeaker-each","provider":"E-piphany","version":"1.0","type":"link"}