Operator`s Manual
Contents
1. STATUS THRESHOLD STATUS THRESHOLD 5 STATUS 900000000 00000000 00000000 RELEASE GAIN dB ATTACK GAIN dB ATTACK RELEASE GAIN GB Turn on the Bypass switch bottom right so that the input signal is heard without compression and adjust the incoming signal until the VU meters rear OdB Set the Bypass switch back to Normal With the Low X Over Frequency set fully counter clockwise and the High X Over Frequency set fully clockwise listen to the audio and bring in the two knobs to the positions that you think the cross over points should be set generally to separate the main bass and treble sounds from the mid range Using a combination of Mute and Bypass switches for the various bands allows the operator to monitor only the frequencies that are required and so tune the low mid and high frequencies Keeping an eye on the Gain Reduction Meters alter the Threshold level control for each band until the desired compression level is achieved a G R level up to 10dB is acceptable Adjust the Gain control of each band until OdB is reached on the Output VU meter To see only the band that is being adjusted on the VU meter Mute the other two bands Set the Attack and Release seitings of each band to suit the audio being compressed The Threshold and Gain of each band can be modified to achieve the desired compression levels and tonal balance to the overall signal At this point the Bypass switch can be toggled to listen2. SLAW gig 4 woo SSVdAg FHF ueg roenv pousan TAT Oh pe SNLWLS YALA PIN INdiNnO XIN SSVdAd pious al i SNIVLS gt ALNW Jy H 4 i SH OLCCOC JSAQ X TANNVHO 11 1973 01 20 03 14 DRAWMER 1973 OPERATOR S MANUAL LOW BAND LOW X OVER MID BAND HIGH X OVER HIGH BAND BIG THRESHOLD dB STATUS FREQ THRESHOLD dB STATUS FREQ AIR THRESHOLD dB STATUS 10 10 10 11 J 0 200 0 2 5 3k 0 5 OFF 20 MUTE 720 2k OFF 20 MUTE ao 19 3 10 400 10 10 H a 4220740 60 ebibo N N N 8k 20 20 20 ON BYPASS m BYPASS ON BYPASS 30 30 14k 30 Hz Hz O O G R 00000 O 20 15 10 7 5 3 2 1 20 15107 5 3 2 1 _ gt a D po 7 a 46 mo u o an 20 20 RELEASE GAIN cB ATTACK RELEASE GAIN dB ATTACK RELEASE GAIN dB 147 27 DRAWMER session Recall DRAWMER ELECTRONICS LTD Coleman Street Rotherham S Yorkshire UK 10 7 57 3 227 7 o 20 40 60 8015 NORMAL OFF BYPASS POWER COPYRIGHT DRAWMER ELECTRONICS LTD 2014
3. IMPLIED OR STATUTORY DRAWMER MAKES NO OTHER WARRANTY EITHER EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT PURCHASER S SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY SHALL BE REPAIR OR REPLACEMENT AS SPECIFIED HEREIN INNO EVENT WILL DRAWMER ELECTRONICS LTD BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY DEFECT IN THE PRODUCT INCLUDING LOST PROFITS DAMAGE TO PROPERTY AND TO THE EXTENT PERMITTED BY LAW DAMAGE FOR PERSONAL INJURY EVEN IF DRAWMER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Some states and specific countries do not allow the exclusion of implied warranties or limitations on how long an implied warranty may last so the above limitations may not apply to you This warranty gives you specific legal rights You may have additional rights that vary from state to state and country to country DRAWMER 1973 Three Band Stereo FET Compressor SAFETY CONSIDERATIONS CAUTION MAINS FUSE TO REDUCE THE RISK OF FIRE REPLACE THE MAINS FUSE ONLY WITH A FUSE THAT CONFORMS TO IEC127 2 250 VOLT WORKING TIME DELAY TYPE AND BODY SIZE OF 20mm x 5mm THE MAINS INPUT FUSE MUST BE RATED AT 230V T250mA and 115V T500mA CAUTION MAINS CABLE DO NOT ATTEMPT TO CHANGE OR TAMPER WITH THE SUPPLIED MAINS CABLE CAUTION SERVICING DO NOT PERFORM ANY SERVICING RE
4. The screens of the signal cables should be connected to the chassis connection on the XLR connector as opposed to connecting to pin The 1973 conforms to the EMC standards SERIAL DRAWMER 14713 THREE BAND STEREO FET COMPRESSOR DRAWN ER 1973 OPERATOR S MANUAL 5 CHAPTER 2 CONTROL DESCRIPTION The 1973 shares similar parameters to a standard full band compressor such as the Drawmer 1968 the difference being that the stereo signal is split into low mid and high bands each one processed separately without affecting the other and then summed back into a stereo signal again before output As you would imagine a multiband compressor could become a very intimidating beast due to ich Band the number of controls however the 1973 as been layed out to be as intuitive to use as possible Compressor Anyone familiar with the Drawmer 1960 s range the S2 and especially the S3 compressors should i Mid Band be immediately at home Essentially the 1973 comprises the three low mid and high compressor bands to the left of the unit with the crossover frequency knobs inbetween These bands are all almost identical the only Compressor difference being the Big and Air switches To the right of the unit the meters and output sections are located see below diagram LOW HIGH CROSS OVER CROSS OVER FREQUENCY FREQUENCY or lt DRAWMER 19A CO 2 LOW BAND oF FANER MID BA
5. after which the signals are recombined and the final Wet Dry mix and levels can be adjusted The advantage is that one band s compression has no affect on the others What s so good about a three band compressor anyway The 1973 can pull off amazing feats that a single band compressor could never accomplish For example it can easily prevent an acoustic guitar cello or double bass from sounding boomy on low notes without thinning the highs Are you recording a vocal track that sounds too shrill The timbre can easily be altered without eliminating detail and clarity Adding heavier compression in the bass band can add to the thickness and richness of the voice in the mid band raspiness is controlled whilst compression to the high band can give sizzle and definition to an otherwise bland voice In addition sibilance can easily be tamed In mastering situation having independent control over each band can resolve a problem mix pulling out individual instruments brighten the brilliance air or make the bottom end of a mix sound huge whilst simultaneously avoid pumping or breathing artifacts and increase headroom Multiband compressors can be intimidating and difficult to use due to a minefield of controls and poor lay out with this in mind the 1973 has been designed to be as simple familiar and intuitive as possible whilst still giving complete control over the audio Main Features Standard intuitive controls such as
6. high power amplifier that would generate heat The appliance should not be operated near any water or in a location where moisture might be present Always connect the mains earth to the unit If the 1973 is to be continuously moved from one location to another we suggest using additional support in the rack at the rear of the unit POWER CONNECTION The unit will have been supplied with a power cable suitable for domestic power outlets in your country For your own safety itis important that you use this cable The unit should always be connected to the mains supply earth using this cable and no other lf for some reason the unit is to be used at a mains input operating voltage which is different to that as supplied the following procedure must be carried out 1 Disconnect the unit from the mains 2 Remove the two screws holding the voltage selection cover plate 3 Remove the cover plate and slide the switch fully to its opposite end 4 Rotate the cover plate one half turn 180 degrees and refit the two screws 5 Replace with a correctly rated fuse for the selected operation voltage in the IEC socket 230V T250mA 115V T500mA 6 Re connect to mains power source Never disconnect the earth from the mains supply 115V T315mA 4 DR AWM ER 1973 OPERATOR S MANUAL AUDIO CONNECTIONS A typical setup for connecting the 1973 would be by the use of a Y lead between the two input and output 5 on the
7. rear of the 1973 and insert point for the respective channel of the desk this would be repeated for both channels The wiring of the Y lead can be seen below The inputs and outputs are electronically balanced on conventionally wired XLRs pin 1 screen pin 2 hot pin 3 cold and XLR shell is connected to chassis The operating level is nominally 4dBu Balanced use is recommended to DESK INSERT 1 SCREEN SEND 2HOT TIP r In TRS to XLR Y Lead insert point _ 1 RING Stereo 5 gna put 7 1 SCREEN SLEEVE Not all mixer insert points are wired gay L R the same check the user manual 3 COLD DISCONNECT GROUND HERE IF GROUND HUM LOOPS OCCUR DISCONNECT GROUND HERE IF GROUND HUM LOOPS OCCUR NEGATIVE COLD POSITIVE HOT SCREEN NEGATIVE COLD POSITIVE HOT SCREEN e Ground Loops If ground loop problems are encountered never disconnect the mains earth but instead try disconnecting the signal screen on one end of each of the cables connecting the outputs of the 1973 to the patchbay If such measures are necessary balanced operation is recommended Ch1 Ch2 e Interference Stereo Stereo If the 1973 is to be used where it maybe exposed to Left Right Ch Ch high levels of disturbance such as found close toa TV radio transmitter we advise that it is operated in balanced configuration
8. FER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL WARNING TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN In the interests of product development Drawmer reserve the right to modify or improve specifications of this product at any time without prior notice 2 DRAWMER 1973 OPERATOR S MANUAL DRAWN 19223 THREE BAND STEREO FET COMPRESSOR CHAPTER 1 THREE BAND STEREO FET COMPRESSOR INTRODUCTION The 1973 is a Three Band Compressor with the versatility control and ability to shape sound that no full band compressor could ever provide and at an affordable price Expanding on the renowned range of dynamics processors D RA WM ER introduce an affordable Three Band Stereo FET Compressor that every engineer will completely appreciate the 1973 The culmination of 30 years of development and experience the 1973 combines the functionality and control of the world class RAW M ER 53 with the familiarity and quality of the illustrious 1960 and 1968 providing three bands of transparent intuitive compression for the price of a conventional single full band compressor How does the 1973 differ from a full band compressor In essence the 1973 comprises a set of crossover filters that splits the audio signal into three frequency bands each split signal then passes through its own compressor and is independently adjusted
9. LOW X OVER FREQ THREE BAND STEREO FET COMPRESSOR Three Band Stereo FET Compressor OPERATOR S MANUAL CONTENTS WANA c22totaceie en gewss ene saraae exaeaeuscbadeceeyaeegaaee tae nae 2 Salely CONSIGCIANON aes 2 Chapter 1 Introduction Introduction 3 Installation 4 Power Connection 4 Audio 5 Chapter 2 Control Description Descrip 6 Quick Setup Procedure 9 Chapter 3 General Information Ifafaultdevelops 10 Contacting 10 SHCCINCAUON 10 Block Diagram 11 Recall 12 COPYRIGHT This manual is copyrighted 2014 by Drawmer Electronics Ltd With all rights reserved Under copyright laws no part of this publication may be reproduced transmitted stored in a retrieval system or translated into any language in any form by any means mechanical optical electronic recording or otherwise with out the written
10. ND s HIGH BAND ees dB STATUS TEES 98 STATUS AIR dB STATUS TE MUTE 02 49 7 s ON ON of Ok a 30 dB G R dB O O ie 52 39 22 3 2 2272 2 N 4 PGM 3 4 3 3 4 5 y d DER 9 40 le 26 65 fF 7 a R AN 4 lt RELEASE GAIN dB RELEASE GAIN dB RELEASE 4 5 6 ve The three bands are almost identical the only difference being the inclusion of Big 8 and Air 9 on the low and high bands respectively X OVER FREQUENCIES Low Split Frequency High Split Frequency 60Hz 1 4kHz 1 4kHz 14kHz The 6dB per octave crossover frequencies determine the points within the frequency spectrum one band stops to process audio and another band takes over Low X Over Frequency 50Hz 1 3kHz Sets the frequency point at which the split between low and mid bands occurs High X Over Frequency 1kHz 14kHz Sets the frequency point at which the split between mid and high bands occurs FREQUENCY 6 DR AWM ER 1973 OPERATOR S MANUAL The following diagram provides a good but general idea of some useful frequencies that will aid in setting the crossover frequencies Range of High X Over Freq 125 256 512 Range of Low X Over Freq t Middle C Bass Snare Tom Snare Tom Snare Cymbol DRUMS Attack Strin BASS GUITAR ACOUSTIC Strin Sibilance LOW BAND MID BAND HIGH BAND Out
11. Threshold Gain Switched Attack amp Release with Gain Reduction Metering on Each Band Fast Reacting Soft Knee F E T Design with excellent Left Right Tracking across the Full Range of compression Variable Wet Dry Mix plus Output Gain Knobs give a Parallel Compression function without the need for external mixing devices providing Complete and Effortless Control over the amount of compression used and Output Levels Variable Band Split Filters at 6dB Per Octave slope with Switch able Mute and Bypass on Each Band make Tuning to a Frequency Simple Big and Modes Help to preserve the Very Deep Lows and Enhance the Sparkling Highs Two Analogue V U Meters with Switchable 10dB Meter Rescale Modes and a Switchable Peak mode to Display Fast Transients Not Normally Seen on Conventional V U s Internal Low Hum Toroidal Linear Power Supply with Voltage Selector Switch Classic Drawmer Build Quality with Rugged Steel Chassis and Aluminium Front Panel DRAWN ER 1973 OPERATOR S MANUAL 3 INSTALLATION The 1961 is designed for standard 19 rack mounting and occupies 2U of rack space Fibre or plastic washers may be used to prevent the front panel becoming marked by the mounting bolts Care should be taken in the choice of positioning The unit should not be mounted where other equipment obstructs the normal air flow The unit should not be situated near any heat source such as a radiator stove or a
12. bination of mute is available to hear only the signal of the low band mute the mid and high bands etc Using a combination of mute and bypass switches for the various bands allows the operator to hear and monitor only the frequencies that are required and so tune in to the low mid and high frequency settings using the cross over controls METERS 11 vu Meter i P 4 DRAWMER Two backlit moving coil VU meters monitor the level of the output signal 147 73 Note To see the input level on the VU meters the Bypass switch should be on gt NORMAL STEREO FET COMPRESSOR Y Y 12 Pad Vu 7 10dB 10dB PEAK A two position switch adjusts the meters PAD vu GAIN dB BYPASS to show either normal output level and gt for those working at hot output levels VU 10dB i e with the switch at VU 12 13 14 15 16 17 10dB when the VU meter reads 0dB the actual level is 10dB 13 Peak VU Peak VU VU On smooth gentle pieces of music the VU average level setting would be sufficient however on fast dynamic signals the Peak VU setting provides more accurate readings OUTPUT Mix WET DRY A variable control that mixes a user defined amount of uncompressed signal dry with the compressed signal wet to create a parallel compression effect without the need for external mixing devices In this way the amount of overall compression on th
13. e stereo signal is under complete control set the three bands to provide heavy compression but then reduce the overal effect by mixing in some of the dry signal using the mix control 15 Gain 12 12dB The 1973 provides a single control to modify the stereo output level after summing without having to adjust the three band gain controls and thus altering the mix Adjust so that the output signal approaches the desired level only on signal peaks Bypass Off On A fully balanced hard wire unit bypass connects the input directly to the output without alteration Note To see the input level on the VU meters the Bypass switch should be on as the meters display the level found at the output 17 Power Off Turns the 1973 on and off This switch is hard wired so when off the 1973 will draw no power 8 DR AWM ER 1973 OPERATOR S MANUAL QUICK SETUP PROCEDURE Please note that the following procedure is only a guide All audio is different requiring numerous settings however this sh 1 the ould give a good staring point Set the compressor settings to be the same on all bands Threshold fully counter clockwise Gain at Attack in a mid position 2 or 3 and Release set to F ast The overall Gain control should be set to and the Mix at Wet G R Bel Oey 6 Be ATTACK 2 Bel 30 30 30 LOW BAND a ER MID BAND lal HIGH BAND THRESHOLD
14. he warranty agreement a service Returns Authorisation RA number will be issued Write this RA number in large letters in a prominent position on the shipping box Enclose your name address telephone number copy of the original sales invoice and a detailed description of the problem Authorised returns should be prepaid and must be insured All Drawmer products are packaged in specially designed containers for protection If the unit is be returned the original container must be used If this container is not available then the equipment should be packaged in substantial shock proof material capable of withstanding the handling for the transit CONTACTING DRAWMER Drawmer Electronics Ltd will be pleased to answer all application questions to enhance your usage of this equipment Please address correspondence to Drawmer Technical Help line Coleman Street Parkgate Rotherham S62 6EL UK Alternatively contact us by E mail on for sales enquiries sales drawmer com or for technical issues tech drawmer com Further information on all Drawmer dealers Authorised service departments and other contact information can be obtained from our web pages on http www drawmer com 1973 THREE BAND STEREO FET COMPRESSOR DATA SPECIFICATION INPUT Input Impedance 20k Ohms or greater Maximum Input Level 26dBu OUTPUT Output Impedance 100 Ohms Maximum Output Level 25dBu into 10k Ohms Load FREQUENCY RESPONSE l
15. permission of Drawmer Electronics Ltd ONE YEAR LIMITED WARRANTY Drawmer Electronics Ltd warrants the Drawmer 1973 Three Band Stereo FET Compressor to conform substantially to the specifications of this manual for a period of one year from the original date of purchase when used in accordance with the specifications detailed in this manual In the case of a valid warranty claim your sole and exclusive remedy and Drawmer s entire liability under any theory of liability will be to at Drawmer s discretion repair or replace the product without charge or if not possible to refund the purchase price to you This warranty is not transferable It applies only to the original purchaser of the product For warranty service please call your local Drawmer dealer Alternatively call Drawmer Electronics Ltd at 44 0 1709 527574 Then ship the defective product with transportation and insurance charges prepaid to Drawmer Electronics Ltd Coleman Street Parkgate Rotherham S62 6EL UK Write the RA number in large letters a prominent position on the shipping box Enclose your name address telephone number copy of the original sales invoice anda detailed description of the problem Drawmer will not accept responsibility for loss or damage during transit This warranty is void if the product has been damaged by misuse modification or unauthorised repair THIS WARRANTY IS IN LIEU OF ALL WARRANTIES WHETHER ORAL OR WRITTEN EXPRESSED
16. put Threshold infinity 32dB all bands Level Determines the level below which compression starts to take 4B place The 1973 incorporates a Soft Knee more compression is applied automatically as the input signal level increases negating the need for a Ratio control Attack see below diagram all bands Controls the speed that the compressor responds to signals that exceed the level set by threshold Six switchable Attack settings All times are nominal the actual attack time is further modified by the release setting chosen Input Level dB Release see below diagram allbands Sets the time taken for the signal to return to normal after the input level has fallen below threshold The first three switch positions are fixed and provide progressively increasing release times while positions F ast M id and S low cause the release times to vary in a manner which automatically adapts to the dynamics of the incoming signal 1Sec F 100mS to 500mS M300mS 2Sec Programme Dependant eS 500mS to 5Sec Release Presets ATTACK RELEASE Attack Presets Gain 10 20dB all bands During compression the signal is attenuated gain may be required to produce the required output level In addition as the 1973 is multi band the three gain controls are used to adjust the levels of each band to obtain a desirable overall signal or to bring out the bass treble etc 7 Gain Reduction Meter _ 1 2 3 5 7 10 15 20dB all band
17. s Use the meter as a guide to how much gain to re apply using the Gain control 6 DR AWW ER 1973 OPERATOR S MANUAL Big Off On low band only Big is located only on the low band and when on reduces the side chain s sensitivity to low frequencies with the result that less gain reduction is applied creating the effect that the bass is louder or bigger The BIG mode enables application in buss compression situations where you still want thick and warm tone yet complete dynamics control Air Off On high band only Air is located only on the high band and is used to re introduce high frequencies which can sometimes be lost after heavy compression so that it sounds more intimate detailed and transparent but without making it sound harsh or introducing any noticeably unnatural artifacts Cymbals are more vibrant without becoming splashy and vocals sound more open but without becoming sibilant Status Mute On Bypass all bands A three postion Status switch is located in each of the bands that allows normal operation bypass or muting of that band In the ON position all the controls of that particular band are in operation and compression takes place In the BYPASS position the signal for the low mid or high band is allowed to pass through to the summing stage without being altered by the compressor stage including gain In the MUTE position the signal for that particular band is effectively turned off any com
18. t 5Hz to 51kHz 1dB lt 3Hz to 70KHz 3dB CROSSTALK lt 80dB 1kHz NOISE AT UNITY GAIN with flat EQ response switched in circuit Wideband 22 2 22kHz 824 87 DISTORTION THD amp NOISE 1kHz OdB ref 4 0 03 10dB ref 4 0 07 20dB ref 4 0 5 POWER REQUIREMENTS 230Volt or 115V at 50 60hZ 60VA FUSE RATING T250mA for 230Volt T500mA for 115Volt Conforming to IEC 127 2 FUSE TYPE 20mm x 5mm Class 3 Timed Blo 250Volt working CASE SIZE 482mm W x 88mm H x 270mm D WEIGHT 4 2Kgs 10 DR AWM ER 1973 OPERATOR S MANUAL BLOCK DIAGRAM NA NA 01 55 ues Hpiousonn Val NA SNLYLS gt ALNW P Eo Kelolele a 55 7 Oro SNIVLS ALNW al SSVdAG LINN INdL XIN SSWdAd ues SNLIVLS gt SLNW Jy H SoLL J8AQ0 X 77 P 2 TANNVHO AlddNS i LEPE EEE ee eae AE E PERE EE EE eee EE E SE ee ee ee ee EE ee eee oe Iv i i NA J8AQ X 01 l A SSWdAd ueg eseeiey Hoey i SNLVLS gt
19. to the affect that the 1973 is having on the audio Adjust to suit Once each band is setup correctly modify the overall Output Gain and Mix until the VU meters read more if in 10dB VU mode and the desired amount of compression is heard ow is an example setup that could be used for a General Pop Mix though of course as all music is diverse and varied will not be ideal elsewhere BIG OFF G R LOW BAND MEE MID BAND HIGH BAND THRESHOLD as STATUS B STATUS THRESHOLD 08 STATUS B g 00000000 00000000 lt 00000006 lt D 4 PGM 5 4 PGM 5 4 PGM 5 ca 2 5 2 2 5 2 2 2 5 2 5 20 1 6 1 6 16 1 6 1 6 16 1 6 1 6 10 NORMAL OFF i H H 20 20 320 1 12 12 ATTACK RELEASE GAIN dB ATTACK RELEASE GAIN aB ATTACK RELEASE PAD vu BYPASS POWER DRAWN ER 1973 OPERATOR S MANUAL 9 CHAPTER 3 GENERAL INFORMATION IF AFAULT DEVELOPS For warranty service please call Drawmer Electronics Ltd or their nearest authorised service facility giving full details of the difficulty A list of all main dealers can be found on the Drawmer webpages On receipt of this information service or shipping instructions will be forwarded to you No equipment should be returned under the warranty without prior consent from Drawmer or their authorised representative For service claims under t
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