‘Quad has done it again: the 988s are world class - the single driver presents a fabulously together sound that’s tough to match at any price’

– What Hi-Fi? (December 2000)

ESL 988

The ESL-988 replaces the much-loved ESL-63 model. Although of similar size and proportions, the resemblance is only skin deep – for more than 90% of the internal components have been re-designed, upgraded, or modified. Twenty years of materials science have led to improvements in virtually every component and area of construction.

The new model has better audio transformers, a new power supply, improved diaphragms, a strong heavyweight moulded base and new grille assemblies. Particular attention has been given to the structural integrity of the loudspeakers, which has been improved beyond all recognition.

The result of these changes is an electrostatic loudspeaker that is as much a leader today as its predecessor was 20 years ago. Larger dynamics and a smoother response are two of the most noticeable improvements in sound quality. A slight backward tilt lifts the stereo image when these speakers are floor standing.

ESL 989

The ESL-989 shares much of its technology with the ESL- 988, but it is a larger model with two extra bass panels and a higher rated power supply. The extra panels increase the bass output, but also contribute to an enhanced performance in the mid-band, which was already widely regarded as the cleanest in the world. Although referred to as ‘bass panels’, the additional electrostatic panels are, in fact, full range (as are all the panels), but the increase in surface area allows a greater volume of air to be moved, leading to an improvement in the lower frequencies. This particular development had been anticipated for many years, but was never previously regarded as commercially and practically viable.

The ESL-989 is Quad’s finest loudspeaker. It is a true full range electrostatic loudspeaker reproducing music with an ease and naturalness that is best described as uncanny. It has a virtual absence of the familiar loudspeaker problems of colouration, distortion, phase and frequency response errors. All that remains is the music and the original ambience. To the listener these are the very ingredients needed to create a real sensation of being there.

The Quad electrostatic loudspeakers are unique and continue to be in a class of their own, but now have the versatility and range to cope with a much wider repertoire.

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QUAD Classic Series ESL manual Esl
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Classic Series ESL specifications

The QUAD Classic Series ESL (Electrostatic Loudspeakers) stands as a notable innovation in the world of high-end audio reproduction, blending sophisticated technology with classic design elements. These speakers offer a unique listening experience that captivates audiophiles and casual listeners alike, making them a prized addition to any audio setup.

At the heart of the QUAD Classic Series ESL is its electrostatic driver technology. Unlike traditional dynamic speakers, which rely on moving coils and magnets, electrostatic speakers utilize a thin diaphragm positioned between two conductive panels. When an audio signal is applied, the diaphragm moves in response to the electrostatic field, creating sound waves that are remarkably accurate and immersive. This design results in a fast response time, extended frequency range, and minimal distortion, ensuring that listeners experience music as it was intended.

One of the standout features of the QUAD Classic Series ESL is its wide soundstage. The planar design of the electrostatic panels allows for exceptional spatial imaging, meaning that sounds appear to emanate from locations across the room rather than just from the speakers themselves. This immersive quality enhances the listening experience, allowing users to appreciate nuances in both music and film soundtracks.

The Classic Series ESL also incorporates advanced technologies such as the QUAD's unique transformer which allows for high voltage deployment necessary for optimal electrostatic performance while maintaining impedance compatibility with a wide range of amplifiers. Additionally, the design features an adjustable frequency response, enabling listeners to tailor the bass output to their specific listening environment, ensuring that the sound adapts to the acoustic properties of any room.

Constructed with high-quality materials, the speakers sport a sleek aesthetic reminiscent of traditional QUAD designs, appealing to those who appreciate a blend of modern technology and classic elegance. In terms of connectivity, the Classic Series ESL is versatile, compatible with both tube and solid-state amplifiers, expanding its usability across different audio setups.

Overall, the QUAD Classic Series ESL offers audiophiles a remarkable blend of innovative technology, elegant design, and superior sound quality. It not only brings music to life but also enriches the listening experience, making it a quintessential choice for those seeking the ultimate in audio fidelity.
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