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LA Audio EQ231G User Manual

Dual 31 band graphic equaliser
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Dual 31 Band
Graphic Equaliser
User Manual

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Summary of Contents for LA Audio EQ231G

  • Page 1 Dual 31 Band Graphic Equaliser User Manual...
  • Page 2 No part of this document may be reproduced without the prior written consent of Audient plc. © LA Audio 2004...
  • Page 3 Thank you for buying this product. As can be found throughout the LA Audio range, your EQ231G has been designed and manufactured to the highest possible standards of performance and reliability. To make the most of your unit, we suggest that you take some time to acquaint yourself with the contents of this manual before you get started.

  • Page 4: Table Of Contents

    User Manual Contents Contents IMPORTANT SAFETY INSTRUCTIONS Safety Information 1. Introduction 2. Installation 3. Operating Instructions 4. Applications & Techniques 5. Block Diagram & Specifications 6. Repairs and Warranty © LA Audio 2004...

  • Page 5: Important Safety Instructions

    THIS EQUIPMENT MUST BE EARTHED. DO NOT EXPOSE TO RAIN OR MOISTURE. PLEASE READ ALL OF THE FOLLOWING INSTRUCTIONS AND SAVE THEM FOR LATER REFERENCE BEFORE ATTEMPTING TO CONNECT YOUR UNIT TO THE AC POWER SOURCE. © LA Audio 2004...

  • Page 6: Safety Information

    DO NOT remove the covers. Refer servicing to qualified personnel only. VOLTAGE The EQ231G is set to operate only at the voltage shown on the outer packaging. CHECK that the correct voltage is available before connecting the AC mains supply.

  • Page 7: Introduction

    1. Introduction 1. Introduction The EQ231G is a high quality dual 31-band 1/3 octave graphic equaliser with variable 12dB per octave Hi-pass filter. A delayed by-pass relay allows silent on/off switching and also provides direct throughput when the unit is not powered. Centre detented, 45mm faders give up to 12dB of cut and boost at 31 ISO centre frequencies, covering the entire audio spectrum (20 to 20KHz).

  • Page 8: Installation

    It is important to read this section before applying power to the unit. 2.1. Inspection and unpacking The EQ231G is carefully packed at the factory in a carton which is designed to withstand handling in transit. However if transit damage is evident, DO NOT discard any of the packaging material and notify the carrier and your dealer immediately.
  • Page 9 This may be achieved by shunting the correct matching resistor across the inputs or outputs. The EQ231G has an input impedance of approximately 20k and an output source impedance of 100 , with the transformer option fitted).
  • Page 10 It should be noted that the filter amplifiers may be driven into distortion by excessive boost in the unit, and where this is the case the input signal should be reduced sufficiently to allow enough headroom. © LA Audio 2004...

  • Page 11: Operating Instructions

    5. High-pass filter bypass switch allows the filter to be taken out of circuit. This allows you to hear its effects when compared to the unfiltered sound, and also to allow low frequencies to pass unaffected. © LA Audio 2004...
  • Page 12 Should the power on the unit fail the unit automatically switches into bypass through a fail-safe relay circuit. © LA Audio 2004...

  • Page 13: Applications & Techniques

    The graphic EQ is usually best for fine-tuning system response. b) Sound-shaping The graphic equaliser may be used to change an original sound to make it more pleasing to the ear or to blend it in with other audio signals without overlap. This © LA Audio 2004...
  • Page 14 To create this effect, first set the hi-pass filter to its highest frequency (160Hz). Then cut completely frequencies between 20 and 315Hz and those between © LA Audio 2004...
  • Page 15 Route the mono signal to both channels of the EQ231G and on each channel cut alternate frequencies by around 6dB. With certain source material, you may need to cut less at low frequencies to avoid an imbalance in the stereo image.
  • Page 16 Boost tends to sound more obvious to the ear, so cut troublesome frequencies rather than boosting nice ones. And finally, remember that while the legend and calibration markings on your EQ231G are a useful guide, they are just that, a guide so be sure to trust your ears.

  • Page 17: Block Diagram & Specifications

    (115/220 VAC, 50-60 Hz) Weight 6.2 kg Dimensions (mm) 483 W x 230 D x 135 H Note: 0dBu is referenced to 0.775 V RMS. Product information and specifications are subject to change without notice. E&OE. © LA Audio 2004...

  • Page 18: Repairs And Warranty

    We will not provide warranty repair if in our opinion the fault has resulted from unauthorised modification, misuse, negligence, act of God or accident. We accept liability to repair or replace your EQ231G as described above. We do not accept any additional liability.