LA Audio Electronic EQ231G-SP User Manual

Dual 31 band graphic equaliser & dynamics processor

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Dual 31 Band

Graphic Equaliser &

Dynamics Processor

User Manual

Table of Contents

Summary of Contents for LA Audio Electronic EQ231G-SP

Page 1 Dual 31 Band Graphic Equaliser & Dynamics Processor User Manual...
Page 2 User Manual Copyright Copyright Copyright 2004. All rights reserved. The information in this document is subject to change without notice. Audient plc makes no warranty of any kind with respect to the material in this document and shall not be liable for errors contained herein or for incidental or consequential damages related to the use of the material.
Page 3 Thank you for buying this product. As can be found throughout the LA Audio range, your EQ231G-SP 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
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 User Manual Contents...
Page 5: Important Safety Instructions
IMPORTANT SAFETY INSTRUCTIONS CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN DO NOT OPEN DO NOT OPEN DO NOT OPEN 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 ©...
Page 6: Safety Information
DO NOT remove the covers. Refer servicing to qualified personnel only. VOLTAGE The EQ231G-SP 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-SP is a high quality dual 31-band 1/3 octave graphic equaliser including variable Hi and Lo-pass filters, Shelving EQ, Gate and Limiter. The Graphic Equaliser features centre detented, 45mm faders which 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-SP 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-SP has an input impedance of approximately 20k 100 , (20 with the transformer option fitted).
Page 10 User Manual 2. Installation (contd.) 2.6. Signal levels The unit is designed to accept an input signal level of up to +20dBu (dB referred to 0.775Vrms). Above this, clipping (distortion) of the signal will occur. 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.
Page 11: Operating Instructions
3. Operating Instructions 3.1. Controls 1. EQ faders allow high-resolution control over EQ gain at 31 ISO frequencies. The frequency is indicated on the front panel, as are the amounts of cut and boost, between –12 and +12 dB. Each fader has a centre detent, which allows you to quickly return it to its inactive (0dB) position.
Page 12 5. Shelving 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. 6. Shelving Filter Frequency rotary potentiometers enable control of the LF and HF shelf frequency.
Page 14: Applications & Techniques
User Manual 4. Applications & Techniques 4. Applications & Techniques A graphic equaliser may be used in numerous situations, in many different ways. It is impossible to document every implementation, but we hope that the following examples will serve as a useful starting point. 4.1.
Page 15 User Manual 4. Applications & Techniques (contd.) technique is quite common in recording or production studios to tailor a sound for its eventual reproduction medium. c) Elimination of "sibilance" Sibilance is the noise which occurs when someone is speaking who either has a "hissy"...
Page 16 Route the mono signal to both channels of the EQ231G-SP 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 17 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-SP are a useful guide, they are just that, a guide so be sure to trust your ears.
Page 18: Block Diagram & Specifications
User Manual 5. Block Diagram & Specifications 5. Block Diagram & Specifications 5.1 Block Diagram © LA Audio 2004...
Page 19 5.2 Specifications Frequency Response Signal to Noise Ratio @ +4dBu output Input impedance Output impedance Maximum Output Level (into 600 Load, 1 kHz, 600 Ohms Load) Total Harmonic Distortion (1kHz, +4dBu Output) Peak indicator Threshold Centre frequencies : 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1k, 1k25, 1k6, 2k, 2k5, 3k15, 4k, 5k, 6k3, 8k, 10k, 12k5, 16k, 20k.
Page 20: Repairs And Warranty
– sifting out any rogue components before they leave the factory. If correctly installed and operated the unit should give years of problem free operation. Your EQ231G-SP comes with a manufacturers warranty for one year from the date of despatch to the end user.