QUAD Classic Series ESL - Manual (Page 10)

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.
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.
ESL 988
ESL 989
‘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)
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