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Dual 31 Band

Graphic Equaliser

User Manual

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Содержание EQ231G

Страница 1: ...Dual 31 Band Graphic Equaliser 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 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 wi...

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 18 ...

Страница 5: ...ING 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 CAUTION ATTENTION RISK OF ELECTRIC SHOCK DO NOT OPEN RISQUE DE CHOC 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 should become so exposed REMOVE the mains power immediately HEAT ALWAYS si...

Страница 7: ... 12dB of cut and boost at 31 ISO centre frequencies covering the entire audio spectrum 20 to 20KHz Inputs and outputs are electronically balanced Each channel has a Peak Indicator illuminating for an equivalent output signal of 18dBu Options The unit can be augmented by parallel outputs offering a unique transformer distortion cancellation circuit This reduces distortion by an order of magnitude c...

Страница 8: ...nt The unit is designed to operate between 0 and 50 C 32 122 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 designe...

Страница 9: ...tching 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 matchin...

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: ...inate 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 the output When this light is on there is a good chance that boost applied in the equaliser s filters will ca...

Страница 12: ...rol varies the turnover frequency from 16 to 160Hz This feature is particularly useful for protecting smaller loudspeakers which will not be able to reproduce very low frequencies or to reduce sub bass response in problematic rooms Should the power on the unit fail the unit automatically switches into bypass through a fail safe relay circuit ...

Страница 13: ...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 14: ...these frequencies meaning that when they are 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 whi...

Страница 15: ...on i e all sliders at 0dB and to increase the overall level in the auditorium until feedback commences Then reducing the level to just under the feedback point each frequency band in turn is boosted until the feedback frequencies have been identified Some practice will enable you to identify frequencies by ear to speed this adjustment By notching the offending bands down slightly the overall level...

Страница 16: ... safeguard PA systems or digital recorders As the equaliser can create changes in volume both with EQ and input gain placing it after a limiter or compressor may cause increases in gain beyond safe limits 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 w...

Страница 17: ...ms Load 20dBu Total Harmonic Distortion 1kHz 4dBu Output 0 003 Peak indicator Threshold 2dB before clipping 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 Frequency accuracy Better than 5 of nominal Power Consumption 115 220 VAC 50 60 Hz 15 Volt Amps Weight 6 2 kg Dimensions mm 483 W x 230 D x 135 H Note 0dBu ...

Страница 18: ... 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 fa...

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