Quad ESL 63 and 57 Repair Kit

B&W DM 70 Repair Kit

For those with damaged Quad ESL’s or B&W DM 70
Hybrid speakers, who are prepared to put in a few hours work to bring their speakers performance back to as new -


These Kits provide sufficient materials to re-diaphram a pair of Quad 63’s, Quad 57’s or B&W Dm 70’s. The kits contain diaphram material, conductive coating, applicator, tension scale, adhesives, foil tape for EHT rail repairs, EHT wire etc.


This kit provides sufficient materials to re-diaphragm a pair of Quad 63’s or 57’s. The kit contains diaphragm material, conductive coating, applicator, tension gauge, adhesives, foil tape for EHT rail repairs, EHT wire etc.


The very thin diaphragm film supplied can also be used as dust covers for the Quads should they require replacement. Sufficient film is supplied in the kit to have plenty spare after the job is finished.
Full instructions are included.

New improved and more comprehensive repair kits

Quad 63

A$192.50 (US $144.00)

Quad 57

A$225.00 (US $169.40)

B&W DM 70

A$170.50 (US $128.00)

Comprehensive instructions are on CD ROM.
Printed Instructions add AUD $22.00
See customer comments in Reviews section.

Quad 63 Review By Arnold from the Phillippines
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B&W DM 70 Review By Ihor from Canada.
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ESL III full range system

(no compromise design)

The three flat panels that make up one loudspeaker are arranged in a curvilinear array ie. the bass panels, which are placed on either side of the centre treble panel, face slightly outward of the speaker centreline.

The outer panels (called bass panels) are actually full range but the high frequencies have poor dispersion due to the width of the panel. To compensate for this the centre treble panel is narrow giving good dispersion which sonically “fills in the gap” between the two bass panels. Kit includes all components cut to size and ready to assemble. All adhesives, applicators etc are provided.

We no longer stock enclosures as many customers required different finishes, timbers etc. Our construction manual includes drawings of 2 cabinet designs, which may be customized to suit individual needs.



   Rear view         Front view

Design Philosophy
ESL lll Electrostatic Loudspeaker

Panel Dimensions
1225 x 550 x 25 Active area 0.55 m2


Frequency Response
35 Hz – 200 Hz + or – 6dB
(this depends on the enclosure)
200Hz – 20 kHz + or – 2 dB


Sensitivity 86 dB @ 2.83 volts (typically)


Kit Price
stereo pair not including enclosures

US ($1550.00)
See Review by Hi Fi World in Reviews section


ELS 5 Full Range kit

The ELS 5 is a dual stacked panel design 305mm wide
by 1950mm high. The two panels that make up one
loudspeaker have an offset, mechanically separate,
treble section to improve dispersion.

Construction is much simpler than the ESL III, having
air gap spacers bonded directly to the stator. The stators are of thicker material, which allows them to be self-supporting when assembled in their sandwich form.

As with the ESL III, the kit comes with everything
that is required to build a stereo pair of speakers,
with the exception of the enclosures.

Panel Dimensions
1950 x 305 x 10 Active area 0.52 m2


Frequency Response
35 Hz – 240 Hz + or – 6dB
(this depends on the enclosure)
240Hz – 20 kHz + or – 2 dB


Sensitivity 85 dB @ 2.83 volts (typically)


Kit Price  stereo pair not including enclosures


US ($1220.00)

Design Philosophy
ELS 5 Electrostatic Loudspeaker


ESL IIIb Full Range Loudspeaker

The ESL IIIb is a flat panel version of the popular curvilinear ESL III. This speaker was originally designed for studio monitoring purposes where detail retrieval and imaging were considered more important than dispersion. Excellent sonic results can be obtained in small to medium rooms with no need for the addition of woofers or sub-woofers.
The ESL IIIb is narrower than the ESL III which has been achieved by removal of the duplicated borders that divide the bass and treble sections. This means that the active area is still the same as the larger ESL III so there is no loss of output.
Incorporating suitable low frequency drivers in the enclosures can result in superb performance in larger rooms.


Panel Dimensions
1215 x 505 x 25 Active area 0.55 m2


Frequency Response
35 Hz – 200 Hz + or – 6dB
(this depends on the enclosure)
200Hz – 20 kHz + or – 2 dB


Sensitivity 86 dB @ 2.83 volts (typically)

Kit Price
stereo pair not including enclosures

US ($1550.00)



The Acorn ESL, Full Range Loudspeaker.

While the Acorn is still under development it is rapidly approaching the point where it will be available.
The Acorn is a dual stacked, flat 3 segment array using discrete bass, mid-range and treble sections. Two flat panels are stacked to create an array that is 1840 mm high. Width is 440 mm.
While the Acorn is an excellent high end audio product, it can be used in modular form as a dual purpose home theatre system. This would comprise of the Acorn ESL’s as the front main speakers and a single Acorn panel (half height) as the rear effects speakers. A central curved ESL is also under development as the center speaker.
The Acorn uses a machined plastic support structure which already incorporates the air gap spacers which significantly reduces construction time.


Full details including costs, frequency response, photographs etc will be available shortly.




Isobaric Sub-Woofer

We have been developing an isobaric low frequency section which combines the necessary speed for good integration with the panel in a comparatively small box which can be built into the standard enclosure.
This project is almost complete and will be shown on this site with full details soon.






The following kits are supplied for home use only and may not be used for commercial gain unless authorised by ER Audio in writing. All photographs, drawings and text contained in the kits are subject to copyright laws and may not be reproduced or copied in part or in full without written permission from E R Audio.
Acceptance of any kit implies acceptance of these terms.

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