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ESLmanual Feb02 11/02/04 9:14 AM Page 1
ESL-988 & ESL-989
Electrostatic Loudspeakers
Instruction Manual
CONTENTS
IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PACKING LIST AND UNPACKING THE EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . 3
GUARANTEE AND PRODUCT REGISTRATION . . . . . . . . . . . . . . . . . .
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ESLmanual Feb02 11/02/04 9:14 AM Page 2 IMPORTANT NOTES European Union Directives Quad equipment is designed to comply with the legal provisions of EU Directives 89/336/EC and 72/23/EEC. The standards which have been applied were those in force at the time of the introduction of the product. The product bears the CE mark: Compliance cannot guarantee perfect performance. In the very rare circumstance that you experience problems you should first try to locate and remedy the origin of any di
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ESLmanual Feb02 11/02/04 9:14 AM Page 3 INTRODUCTION The Quad ESL loudspeaker is a full range electrostatic loudspeaker doublet. It consists of a very light electrically polarised diaphragm suspended between two sets of concentric annular electrodes. Signal is fed to the electrodes via sequential delay lines causing the diaphragm to move and the motion of the diaphragm produces a sound pressure pattern which is an exact replica of that from an ideal source placed some 30cm behind the plane of
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ESLmanual Feb02 11/02/04 9:14 AM Page 4 GUARANTEE AND PRODUCT REGISTRATION Your Quad equipment is guaranteed against any defect in material and workmanship for one year from the date of purchase (proof of purchase required). We ask you to complete and return the enclosed Warranty Registration Form (UK). This will also enable us to keep you informed of future Quad products. Within the guarantee period, Quad will undertake replacement of defective parts free of charge provided that the failure
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ESLmanual Feb02 11/02/04 9:14 AM Page 5 INSTALLATION The ESL loudspeaker requires an energising voltage for operation and therefore needs to be connected to an AC power supply. Checking the AC power supply The ESL loudspeaker is designed to operate on one range of AC power supply only, 50/60 Hz. Either 200-240V or 100/120V. The correct operating voltage is clearly marked on the base. It may be changed from 220V to 110V operation or vice versa by a suitably qualified technician. Before connect
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ESLmanual Feb02 11/02/04 9:14 AM Page 6 Each loudspeaker should be connected to its appropriate amplifier output so that the two pairs of wires are connected in the same way, to ensure that the speakers operate in phase. Switching On and Off The on/off switch has a rocker action; press the bottom to switch the ESL on and the top to switch it off. A red LED next to the on/off switch indicates that the speaker is on. Amplifier Requirements The ESL loudspeaker should be used with an amplifier o
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ESLmanual Feb02 11/02/04 9:14 AM Page 7 When experimenting, it is preferable to use good recordings or works with which you are familiar in the concert hall or good quality speech. The ESL loudspeaker, being a dipole source, has considerable advantages over conventional loudspeakers in terms of room placement. No energy is radiated in the plane of the diaphragm and as a consequence, the respective axial room modes are discriminated against. Normally the loudspeaker is placed at an angle to bo
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ESLmanual Feb02 11/02/04 9:14 AM Page 8 CARE AND MAINTENANCE The grille cloth may be cleaned with a soft brush or a hand held vacuum cleaner. They are protected against the ingress of dust etc. Periodic servicing at two year intervals is recommended to keep your speakers in pristine condition. Great care has gone into the selection of materials to ensure long term stability under a wide range of temperatures and humidity. In countries where the relative humidity regularly exceeds 90% it is
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ESLmanual Feb02 11/02/04 9:14 AM Page 9 ESL-988 SPECIFICATIONS All measurements made with a 230V AC supply. 2 Maximum output 2 N/m at 2m on axis Sensitivity 1.5m bar per volt referred to 1m. (86 dB/2.83V rms) Impedance 8 Ohms nominal Maximum Continuous input voltage (rms): 10V Programme peak for undistorted output: 40V Permitted peak input: 55V Directivity Index 125 Hz 5.0 dB 500 Hz 6.4 dB 1 kHz 7.2 dB 8 kHz 10.6 dB Axis band limits -6 dB at 35 Hz 3rd order (low level) -6 dB >20 kHz AC Input
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ESLmanual Feb02 11/02/04 9:14 AM Page 10 ESL-989 SPECIFICATIONS All measurements made with a 230V AC supply. 2 Maximum output 2 N/m at 2m on axis Sensitivity 1.5m bar per volt referred to 1m. (86 dB/2.83V rms) Impedance 8 Ohms nominal Maximum Continuous input voltage (rms): 10V Programme peak for undistorted output: 40V Permitted peak input: 55V Directivity Index 125 Hz 5.0 dB 500 Hz 6.4 dB 1 kHz 7.2 dB 8 kHz 10.6 dB Axis band limits -6 dB at 30 Hz 3rd order (low level) -6 dB >20 kHz AC Input
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ESLmanual Feb02 11/02/04 9:14 AM Page 1 IAG House Sovereign Court Ermine Business Park Huntingdon Cambs PE29 6XU England Telephone: +44 (0) 1480 447700 Facsimile: +44 (0) 1480 431767 email: info@quad-hifi.co.uk website: www.quad-hifi.co.uk
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ESLmanual Feb02 11/02/04 9:14 AM Page 2 Instruction Manual for Electrostatic Loudspeakers ESL 988 and ESL 989
