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User Manual

Contents

© LA Audio 2004

4

Contents

IMPORTANT SAFETY INSTRUCTIONS

5

Safety Information

6

1. Introduction

7

2. Installation

8

3. Operating Instructions

11

4. Applications & Techniques

13

5. Block Diagram & Specifications

17

6. Repairs and Warranty

19

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Содержание EQ231G-SP

Страница 1: ...Dual 31 Band Graphic Equaliser Dynamics Processor User Manual ...

Страница 2: ...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 No part of this document may be reproduced without the prior written consent of Audient plc ...

Страница 3: ... we suggest that you take some time to acquaint yourself with the contents of this manual before you get started The safety and installation information will help you set up your EQ231G SP with the minimum of effort while the operational guide describes the unit s controls and functions The applications section gives useful hints on how to get the most out of your unit in numerous situations along...

Страница 4: ...Audio 2004 4 Contents IMPORTANT SAFETY INSTRUCTIONS 5 Safety Information 6 1 Introduction 7 2 Installation 8 3 Operating Instructions 11 4 Applications Techniques 13 5 Block Diagram Specifications 17 6 Repairs and Warranty 19 ...

Страница 5: ...T 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 CAUTION ATTENTION RISK OF ELECTRIC SHOCK DO NOT OPEN DO NOT OPEN DO NOT OPEN DO NOT OPEN RISQUE DE CHOC NE PAS ENLEVER NE PAS ENLEVER NE PAS ENLEVER NE PAS ENLEVER ...

Страница 6: ...e only at the voltage shown on the outer packaging CHECK that the correct voltage is available before connecting the AC mains supply FUSES CHECK that the fuse fitted is of the correct type for the local mains voltage ALWAYS replace fuse with the correct type MOISTURE DO NOT expose the unit to rain or moisture If your EQ231G SP should become so exposed REMOVE the mains power immediately HEAT ALWAYS...

Страница 7: ... provided at 0dB Two rotary potentiometers enable control of the LF and HF shelf frequency A bypass switch allows the whole section to be taken out of circuit The Dynamics section uses a fast RMS detector with soft knee action The Limiter has a 3 segment LED gain reduction display The Gate has an LED indicator illuminating when the signal is below threshold A delayed by pass relay allows silent on...

Страница 8: ...ment The unit is designed to operate between 0û and 50ûC 32û 122û F in an atmosphere of relative humidity up to 80 Should the unit be installed in an equipment rack it is important to ensure that the operating temperature inside the rack does not exceed the upper limit This may be the case where the rack contains power amplifiers and a cooling fan may be necessary in such installations Although de...

Страница 9: ...ching as long as the succeeding input is greater than the stated minimum for the output it is connected to LA Audio products conform to this standard therefore inputs and outputs are usually indifferent to varying load or source impedance The only exception to this rule is where the unit is connected to a transmission line or some older vacuum tube equipment which require proper impedance matching...

Страница 10: ...nal 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 ...

Страница 11: ... switch allows the graphic filters to be taken out of circuit for comparison checks The adjacent LED illuminates when the filters are IN circuit i e the graphic is functioning 3 Gain control adjusts gain at the input stage ranging from to 6dB The centre detent allows the unit to quickly be set to unity gain 0dB 4 Peak LED This illuminates when the audio signal is within 2dB of clipping 18dBu at th...

Страница 12: ...ynamics section features a Limiter and a Gate The Gate Threshold potentiometer controls the level of signal necessary to turn on the gate Below this level the signal is attenuated in such a way that unwanted noises such as hiss and hum are reduced The Gate LED illuminates when the signal is below threshold indicating the gate is closed 11 The Limiter Threshold potentiometer controls the level abov...

Страница 13: ...User Manual 3 Operating Instructions contd LA Audio 2004 13 ...

Страница 14: ...ive tonal character There are several ways of measuring a room s frequency response and these are usually all similar in technique although differing in hardware Using a Real time analyser inconsistencies in the system s frequency response can be detected and corrected with the graphic EQ Alternatively adjustments can be made by ear in response to trial system output such as CD playback It is impo...

Страница 15: ...e most present the compressor will reduce the signal level thereby stopping the sibilance from reaching its full volume Because the EQ is inserted into the compressor s sidechain and not the signal path the EQ boost will be inaudible at the compressor s output d Elimination of proximity effect Cardioid microphones usually have a low frequency emphasis which in certain situations can present proble...

Страница 16: ...tified Some practice will enable you to identify frequencies by ear to speed this adjustment By notching the offending bands down slightly the overall level may be increased This may be repeated until the overall gain reaches the required level It is worthwhile to note that if boosted sufficiently all frequencies will eventually feed back so a balance should be struck between gain and tonal integr...

Страница 17: ...s 4 2 A word of caution Sadly graphic EQs can t cure every problem you re likely to encounter as an engineer Not only that but it s highly unlikely that you ll ever get a truly flat room response without calling in some builders Consequently a compromise must be struck between technical perfection sonic quality and very often the time taken to reach such a balance There are three things worth reme...

Страница 18: ...User Manual 5 Block Diagram Specifications LA Audio 2004 18 5 Block Diagram Specifications 5 1 Block Diagram ...

Страница 19: ...30 800 1k 1k25 1k6 2k 2k5 3k15 4k 5k 6k3 8k 10k 12k5 16k 20k Limiter Threshold 6 to 20dBu Gate Threshold 70 to 20dBu Limiter Ratio 20 1 soft knee Gate Ratio 10 1 soft knee Hi Pass Filter corner frequency 16Hz to 160Hz Hi Pass Filter slope 24dB Octave Butterworth Lo Pass Filter corner frequency 3KHz to 32KHz Lo Pass Filter slope 12dB Octave Butterworth LF Shelving EQ Frequency 16Hz to 160Hz HF Shel...

Страница 20: ...rs warranty for one year from the date of despatch to the end user The warranty covers faults due to defective materials used in manufacture and faulty workmanship only During this warranty period LA Audio will repair or at its discretion replace any faulty unit provided it is returned carriage paid to an authorised LA Audio service centre We will not provide warranty repair if in our opinion the ...

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