THE GL2
Contents
1. AILLLIV HEATH EB sae mic splitter T gt lt U m m Wu on ye ENGINEERS WEDGE MONITOR 5 RN o Set up the WEDGE MIX by selecting one yi a oe ai pee peo Uaa lent Ea ES 4 or a combination of the group L R AFL o 2 Q e 2 R O monitor 1 to 6 switches to listen to the 0 Ss AAAA desired stage monitor outputs These are ae Ce 00e 0000000 post insert post graphic EQ and post oO 00 00 insert o output fader for accurate monitoring OROROORO EFFECT E Pressing any PFL switch automatically LEU EO overrides the selected AFL source to allow 0e O pI sescee channel setup and signal checking EQUALISERS Graphic equalisers plugged into the console inserts are an invaluable aid to reducing on stage acoustic feedback and enhancing the clarity of the monitors Using the qi inserts allows the stage engineer to check the operation of the equalisers in his wedge p eT monitor It is best to use the same type of loudspeaker for the engineers monitor as BE inserts the stage monitors k gt ala z o olala a x olo 7 This example shows the 6 aux sends routed gt olo These switches are recessed through the main outputs to provide 6 inde oo 0 to avoid accidental 0 0 0 0 0 operation Set using a pen pendent stage monit2. GL2 RACK MOUNT MIXER bags Loa PUBLICATION AP0177 LIMITED ONE YEAR WARRANTY This product has been manufactured in the UK by ALLEN amp HEATH LTD and is war ranted to be free from defects in materials or workmanship for a period of one year from the date of purchase by the original owner To ensure the high level of performance and reliability for which this equipment has been designed and manufactured please read the User Guide before use In the event of a failure notify and return the defective unit to ALLEN amp HEATH or its authorised agent as soon as possible for repair under warranty subject to the following conditions CONDITIONS OF WARRANTY The equipment has been installed and operated in accordance with the instructions in the User Guide The equipment has not been subject to misuse either intended or accidental neglect or alteration other than as described in the User Guide or Service Manual or approved by ALLEN amp HEATH Any necessary adjustment alteration or repair has been made by ALLEN amp HEATH or its authorised agent The defective unit is to be returned carriage prepaid to ALLEN amp HEATH or its authorised agent with proof of purchase 5 Units to be returned should be packed to avoid transit damage These terms of warranty apply to UK sales In other territories the terms may vary according to legal require ments ALLEN amp HEATH AGENT U
3. INPUT A set the IN A B switch up For INPUT B set the IN A B switch down MONO combines the left and right inputs to mono the source or may be used to input a mono source to the stereo channel path The GAIN control allows a wide range of equipment to be correctly matched to the console 4 BAND EQUALISER Shelving HF and LF and two fixed frequency peak dip mid controls provide 144B of cut and boost EQ IN switches the equaliser in or out of the channel path Centre detents set the response flat 6 AUX SENDS 6 individual sends with 1 4 and 5 6 switchable pre post fader provide effects and foldback sends for recording or F O H or monitor mix sends for ON STAGE console operations Internal links for the pre fade sends are set as standard to pre EQ post EQ option and post mute pre mute option The L and R stereo signals are combined to provide the aux feeds in mono ROUTING The PAN control changes its characteristics depending on the MONO switch status In stereo PAN functions as a balance control usually to adjust for imbalance in the source In mono it provides true pan to position the signal in the stereo image The 100mm long throw FADER provides a further 10dB boost above the normal 0 operating position MUTE switches the channel off CHECKING THE SIGNAL The red PEAK LED warns of potential overload 5dB before clipping at the pre fade L and R channel points Pressing PFL rout
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5. AUX 1 6 OUT OPTION RETURN tea IN AUX OUT STANDARD PHONES MONITOR v o LEFT A oRIGHT Tane 2dBu 0 Lo RING IN ya FOR XLR LINE INPUT MIC LINE IN PLUG LINE JACK py eee mS N ic REFER TO THE GL2 USER GUIDE FOR FURTHER INFORMATION MANUFACTURED IN ENGLAND BY ALLEN amp HEATH LTD CONNECTIONS INPUTS STEREO INA STEREO IN B RETURN IN 2 TRACK RETURN INSERT RETURN OUTPUTS GROUP OUT AUX OUT 2 TRACK SEND INSERT SEND MONITOR OUT PHONES OUT 1 4 JACK 1 4 JACK RCA PHONO 1 4 JACK 1 4 jack 1 4 jack pin 2 hot 3 cold balanced pin 2 hot 3 cold balanced tip hot ring cold balanced tip hot ring cold unbalanced unbalanced tip hot ring gnd unbalanced unbalanced tip send ring ret unbalanced pin 2 hot 3 cold balanced pin 2 hot 3 cold balanced pin 2 hot 3 cold balanced tip hot ring gnd unbalanced unbalanced tip send ring retunbalanced tip left ring right unbalanced variable 60 to 10dBu variable 40 to 10 dBu variable 40 to 10 dBu variable 20 to 22 dBu variable 20 to 22 dBu variable 10 dBV min 10 dBV 2dBu 4dBu 27 dBu max 4 dBu 27 dBu max 4 dBu 27 dBu max variable 21 dBu max 10dBV 2 dBu 21 dBumax variable 21 dBu max tip left ring right for stereo headphones 8 to 400 ohms aa ULI Ad HEATH INSTALLING THE CONSOLE The GL2 fits into an 11U space in a standard 19 rack system Alterna
6. K FACTORY ALLEN amp HEATH Ltd Kernick Industrial Estate Penryn Cornwall TR10 9LU HI A HARMAN INTERNATIONAL COMPANY ULI PNI Ad HEATH INTRODUCTION The GL2 continues ALLEN amp HEATH s commitment to provide high quality audio mixing consoles engineered to meet the exacting requirements of today s audio business It brings you the latest in high performance technology and offers the reassurance of over two decades of console manufacture and customer support This user guide presents a quick reference to the function application and installation of the GL2 For further information on the basic principles of audio system engineering please refer to one of the specialist publications available from bookshops and audio equipment dealers Whilst we believe the information in this guide to be reliable we do not assume responsibility for inaccuracies We also reserve the right to make changes in the interest of further product development SERVICE AND TECHNICAL SUPPORT Under normal conditions the GL2 does not require user maintenance or internal calibration Any service work required should be carried out by qualified service personnel only We are able to offer further product support through our worldwide network of approved dealers and service agents To help us provide the most efficient service please would you keep a record of the console serial number and date and place of purchase to be quoted in any communication regard
7. ROUTING Centre detented PAN positions the signal between L odd and R even of the selected groups L R mix This positions the signal as required in the stereo image or may be used to route to single mono outputs only The 100mm long throw FADER provides a further 10dB boost above the normal 0 operating position MUTE switches the channel off CHECKING THE SIGNAL The red PEAK LED warns of potential overload 5dB before clipping at any of 3 key points in the channel path Pressing PFL routes the pre fade signal to the console monitor meter system to check sound quality and gain setting The PEAK LED will illuminate at HALF bright ness when the PFL switch is pressed ULI PNI STEREO Ad HEATH 1 STEREO N amp 7 q LINE L gt ZENJ Q S27 LINE 00 UNBALANCED LINE SIGNAL p DUAL INPUT The stereo channel features a dual input which selects between two alternate stereo sources This is ideal for fast switching between stereo sources without the need to re patch the console It also allows connec tion to standard leads with either jack or phono plugs The stereo channels may also be used for returns from stereo effects processors providing full EQ sig nal checking routing and feeds to foldback monitors To avoid feed back do not send the return back to itself through its post fade aux send MATCHING THE INPUT For
8. mix Pressing any PFL switch allows the engineer to check the channel signals for example while setting the gains or EQ On stage monitor systems usually include a graphic equal iser on each monitor feed adjusted to tune out the resonances which cause acoustic feedback These equalisers should be patched into the console group inserts so that their effect may be monitored when AFL is pressed THE MAIN L R OUTPUTS The L and R output section is identical to the group section with aux reverse switching which configures the main outputs for aux 5 6 when required Note that the subgroups always route to the L R mix and are therefore present at the aux 5 6 outputs when reverse is selected It is possible to set up an additional stereo or two mono monitor sends from a combination of monitors aux 1 to 4 when SUBGROUP is selected Alternatively the four return inputs provide a fully independent stereo sub mixer when RETURN is selected a ULZ LA ane FRONT OF HOUSE L conference club disco live shows theatre church touring aa pre fade aux sends EFFECTS sends returns COMPRESSORILIMITERS i These are often used to prevent excessive peaks overloading the amplification J eeose gt system for example in club installations subject to sound lev
9. to stereo eee o gt Comprehensive master section providing pre or post fader L R monitoring auto PFL AFL and 2 track record facility STAGE MONITOR Balanced mic and line inputs with wide ranging pre amp and 4 band EQ 6 stage monitor sends with pre post fader switching on 1 4 and 5 6 6 balanced XLR stage monitor outputs with inserts metering and signal checking Comprehensive master section providing headphones monitor and separate engineers wedge output RECORDING 4 group outputs with 4 tape monitor inputs for multitrack recording Separate stereo mix and 2 track record outputs 2 track tape monitoring 10 mono and 2 stereo input channels PLUS MULTIMODE OPERATION configures the GL2 as a stereo mono F O H console with 4 full feature stage monitor sends and 2 effects sends 2 dedicated stereo channels with dual input sources separate left and right connectors EQ and full routing 3 point peak indicators on channel inputs Mute switches AFL checking and peak indicators on group and L R outputs Inserts on channel inputs groups and L R outputs Electronically balanced channel inputs and group L R and mono outputs Internal power unit with ground lift switch Compact all metal construction for rack or plinth mount and adaptable for table top operation eee ee oe eo o Professional quality assembly with individual circuit assemblies 100mm long throw faders and quality components used throughout to ens
10. ATCHING THE INPUT A wide ranging padless input pre amplifier matches the connected audio source to the console Use the PFL system to set GAIN for the correct internal operating level 0dB on the meters Centre position provides 10dB line gain MIC LINE selects a balanced mic or line XLR source Connecting to the additional 1 4 jack balanced line input automatically overrides the XLR line input For MIC INPUT only connect to the XLR socket Select MIC or LINE to provide a 20GB pad for very high output microphones For LINE INPU only connect either to the XLR or jack connector and select LINE For MIC AND LINE INPUT selectable using the switch connect mic to the XLR and line to the jack socket Individual 48V phantom power switches are located on the rear panel recessed to prevent accidental operation Use only with phantom powered microphones connected with correctly balanced cables 4 BAND EQUALISER Shelving HF LF and two wideband peak dip mid sweeps provide 14 dB of cut and boost EQIN switches the equaliser in or out of the channel path Centre detents set the response flat 6 AUX SENDS 6 individual sends with 1 4 and 5 6 switchable pre post fader provide effects and foldback sends for recording or F O H or monitor mix sends for ON STAGE console operations Internal links for the pre fade sends are set as standard to pre EQ post EQ option and post mute pre mute option
11. FL pre fade listen AFL after fade listen system lets you listen to and check the level of signals at different points in the signal path without affecting the main outputs Use the channel PFL switches to set up the input levels This overrides the phones monitor outputs with the pre fader channel signal in mono and displays its level on the monitor meters Adjust the channel GAIN controls for an average 0 reading on the meters Use the aux group and L R AFL switches to check the post master fader mix levels Adjust the channel faders for optimum mix level The normal operating setting of the faders is at the 0 position allowing 10dB of boost to the top of travel The red channel and group L R PEAK indicators give instant warning of potential signal overload These illuminate 5dB before clipping Reduce channel gain or fader settings as appropriate Each Group fader has a meter ladder showing signal presence dynamic indication starting at 20dB OdB level and peak 5dB below clipping OPTIONS AUX SENDS Aux 1 4 and aux 5 6 are switched pre or post fader using panel switches to satisfy most applications without the need to access internal circuits Pre fade is set pre EQ and post mute as standard Contact your service agent should you require alternative settings An option is available to balance the aux jack outputs Note that the standard aux outputs are low impedance high level line signals which are interference free and do not requir
12. e balancing unless extremely long cables are connected in the presence of high level interference and hum fields The options should be fitted only by competent technical personnel who have reference to the GL2 service manual CONSOLE EXPANDER The GL2 Sys link option may be installed such that two GL2 consoles operate as one in a master slave arrangement This is not a user fitted option Contact your service agent for details AALLLIV yoy Ad HEATH PRECAUTION ALWAYS MAKE SURE THAT 48V SWITCHES ARE OFF UP POSITION WHEN THE CHANNEL INPUT XLRS ARE CONNECTED TO NON PHANTOM POWERED OR LINE SOURCES ALINE IN f N y 48V MIC LINE IN 10 A INSERT f N J BALANCED LINE IN 7 TIP IN LINE 116 RING IN 4 4 FOR XLA MIC LINE IN LINE INPUT UNPLUG LINE JACK IN MIC HIN INSERT SEND o gt RET v 2dBu The normalled INSERT socket provides a pre EQ 2dBu break point for inserting an external efftects or signal processing de vice into the channel path This may also be wired as a pre fade direct output by linking send to return in the plug and tapping the signal from this point Use the PFL system to match the inserted device to the operating level of the channel E MIC a LINE GAIN 30 OdB 20 4020 ub Me yA INE Te 7 10 1 0 40 To HF 12kHz lt lt 14 akHz 14 500Hz 15kHz F1 9 14 14 ULZ INPUT M
13. e controlled by the 100mm long throw FADERS which offer a further 10dB boost above the normal 0 operating position MUTE switches off the output Pressing AFL routes the post fader signal to the console monitor meter system to check sound quality and mix level The AFL signal is pre mute to allow the output to be muted if required while checking the signal Each main output has a dedicated post fader LED metering system SIG responds dynamically to the audio signal starting to illuminate around 20dB level OdB turns on at the console OdB level 2dBu internal PEAK warns of potential overload 5dB before clipping ULI PNI MASTER Ad HEATH ONITOR METER MONO PHONES MONIT OR ji N SEND O L SS RET KO L MAIN OUTPUTS 0uT S 4dBu PHONES MONITOR o LEFT 3 o RIGHT SIGNAL MONO DUT OoN PHONES MONO OUT LEV 64 9 5 3 T e 8 1 o 10 MONITOR Hi wile MODE AFL PFL L R PRE source Soe 2 TRK OPFL AFL PHONES O MONITOR 4 6 EV ley gai n p 9 o 10 PEAK ods R AUX E REV MUTE oll R 6 LC AFL PEAK odB L AUX REV SI IG oll MUTE L O a MONITORING THE SYSTEM The PHONES MONITOR section allows the engineer to listen to L R aux 5 6 either PRE or POST the master faders or 2 TRACK return through u
14. el control This example shows the 4 groups L R and Mono outputs feeding a 7 stack FOH amplifica oo tion system The groups provide independent ooo a a control of the additional left and right loud gt eee These switches are speaker stacks or may be used for separate o o recessed to avoid effects or zone feeds or for subgrouping to the 0 oO accidental operation Set L R mix Aaa using a pen tip or pointed 10 O object Select aux to 4 post fade to access 4 effects 20 O Set the MONITOR processing devices Use Return inputs 1 to 4 to We 4 s MODE switch to the up add the effects to the L Mono R outputs Alter POST 72 bolo position formono out L R natively use the stereo or mono channels to mix sol ooo sum the effects into the groups and foldback as well Payee ye Set the REV switches to ojojojo the up position for Select aux 5 and 6 pre fade for 2 foldback 2 zo conventional group LR monitor sends 5 5 operation The channel and output inserts may be used for Bag floating effects and signal processing devices such as compressors limiters and graphic equal isers ULZ ON STAGE MONITOR On stage mixing system for local control of performers monitor loudspeakers wedges With dedicated output for the stage engineers wedge loudspeaker Ea STAGE MONITORS
15. entiometers and cosmetics by avoiding drinks spill age tobacco ash and smoke and exposure to rain and condensation Protect from excessive dirt dust heat and vibration copyright 1993 ALLEN amp HEATH Ltd All rights reserved Publication AP0177 Issue 1 l y y hy j a a amamaaa AILL LIV Ad HEATH ULZ THE GL2 The ALLEN amp HEATH GZ2 offers the flexible solution to the many requirements of the live sound and recording environment whether for conference sound in a club theatre or church for touring contract hire as well as stereo and multitrack recording The key to this versatility is the unique switching arrangement which configures the console for Front of House or On stage Monitor operation or a combination of both 6 Aux sends switchable in combinations of pre or post fader a powerful 4 band 2 sweep equaliser dedicated stereo channels and comprehensive monitoring facilities combine in a compact all metal rack mount chassis to allow total and reliable control of the mixed sound whatever the application FEATURES The choice of console operating mode at the press of a switch FRONT OF HOUSE Wide range 4 band 2 sweep channel equaliser with in out switch 6 aux send controls with pre post fader switching on 1 4 and 5 6 Balanced XLR Left Right and Mono outputs 4 balanced XLR group outputs with subgrouping
16. es the pre fade signal in mono to the console monitor meter system to check sound quality and gain setting The PEAK LED will illuminate at HALF brightness when the PFL switch is pressed FALLLIV YoY Oc HEATH 2 o a I 2 2 4 ta a Wo D D D WW Q D Z D iN x GOGO we SENDS Do m D MAIN OUTPUTS 0UT 4dBu 4 AUX OUT ji SERT 4 OUT SIGNAL SEND T o gt RET 2dBu AFL MIX MUTE om GROUP FADER i IW 5 20 AUX SEND MASTERS s AUX 5 Node 3 8 1 9 o 10 om AFL 5 AUX 5 A 7 4a 8 A 9 o 10 AFL RETUAN SUB 4 mii Cc RETUAN SUB 3 ed ULZ GROUP OPERATING MODE The recessed GRP AUX REV switch determines the way in which the group signal path is arranged For conventional operation FRONT OF HOUSE or RECORDING switch up the group mix is routed ous GRP AUX REV ia O MUTE 4 LO AFL to the main signal path through the insert FADER and MUTE switch to the balanced XLR output while pro viding subgrouping AFL monitoring signal and PEAK metering The related aux mix routes through the rotary SEND MASTER level control to the 1 4 jack aux output with AFL monitoring available to provide an effects or foldback send Wit
17. et the correct angle 83 14 degrees for table top operation with adequate clearance for the connectors 442 4 Support the rear of the console to achieve this angle Operation in this way prevents interference with the connectors and takes up the minimum of table space PRECAUTION TO AVOID DAMAGE TO THE INTERNAL ASSEMBLIES DO NOT FIT SCREWS THROUGH THE HOLES IN THE SIDES OF THE CONSOLE SECURE TO EXTERNAL BRACKETS OR FITTINGS THROUGH THE TOP PANEL RACK MOUNTING HOLES EARTHING THE AUDIO SYSTEM The console chassis is connected to mains earth via the power cord FOR SAFETY REASONS NEVER REMOVE THE EARTH WIRE FROM THE MAINS PLUG The console audio OV is connected to mains earth within the console power unit by the ground lift switch To prevent mains born and external interference pick up on the audio signal it is important that this audio OV is connected to a good noise free mains earth either through the audio cable screens or by linking to a local earth Multiple earth paths cause earth ground loops which may result in audible hum and interference These may be avoided by making sure that there is only one path to earth from each piece of equipment disconnecting audio cable screens at one end if necessary Selecting the ground lift switch on the rear of the console disconnects the console audio OV from the chassis mains earth This avoids ground loops in situations where the chassis metalwork is in physical co
18. h the switch pressed using a pen tip or similar the group and aux mix is reversed so that the signal path is optimised for ON STAGE MONITOR operation This feeds the aux mix through the main signal path to provide a full feature balanced stage monitor send In this mode the group mix is rerouted to the related aux jack output through its send master and is available for additional monitor effects or sub sends It is advisable to study the GL2 system block diagram to fully understand this flexible routing arrangement RETURN SUBGROUP To RETURN processed signals from external effects devices or input additional line signals to the L R mix or for TAPE MONITORING during multitracking set the RET GRP switch to the up position Use the LEV and centre detented PAN controls to adjust the level and stereo image PEAK ods moe REV SIG om MUTE 3 Ol AFL 10 10 20 20 30 30 co lee SUBGROUPING enables several sounds to be com bined under control of a single fader and then routed to the main L R mix To set up a subgroup route the required channels to a group press the GRPswitch and adjust LEV and PAN for the desired level and stereo image in the L R mix Using the channel and subgroup PAN controls it is possible to set up mono or stereo subgroups CONTROL OF THE OUTPUTS The main outputs group or aux mode as selected ar
19. ing this product SAFETY WARNING Mains electricity is dangerous and can kill Mains voltage is present within the console power unit Do not remove the internal power unit or rear cover with mains connected Check your mains wiring and earthing before switching on DO NOT REMOVE THE MAINS EARTH CONNECTION The console chassis is always connected to mains earth to ensure your safety Audio OV is connected to mains earth within the power unit Operating the ground lift switch on the rear panel of the unit will separate audio OV from mains earth This switch can be used to avoid problems with ground loops PRECAUTIONS AC POWER Check the power supply label for the correct AC mains voltage setting Allow adeguate space behind the console for ventilation o CONNECTIONS Use audio connectors and cables only for their intended purpose Do not connect any source of AC or DC power to the console audio connectors Do not connect the output of power amplifiers directly to the console o CLEANING Avoid the use of chemicals abrasives and solvents The control panel is best cleaned with a soft brush and lint free cloth To remove stubborn marks such as chinagraph pencil isopropyl alcohol may be used o LUBRICATION The faders switches and potentiometers are lubricated for life The use of electrical lubricants on these parts is not recommended o DIRT DUST SMOKE and MOISTURE Prevent damage to the moving parts such as faders and pot
20. ntact with another path to earth often the case in 19 rack installations or if audio OV connects to mains earth elsewhere in the system Ground lift switch located on rear of the console power unit Press to disconnect audio OV from mains earth ULZ PNI HEATH INTERCONNECTIONS Where possible use balanced connections for the channel INPUTs and GROUP L R and MONO outputs to minimise noise pick up Avoid running audio cables near to mains or lighting cables or thyristor dimmer units power supplies etc These may cause audible hum and buzz The use of low impedance sources significantly reduces interference pick up Check the cables for correct wiring to avoid problems with phase reversal and unreliable connection The GL2 follows the convention for XLR pin 2 and jack tip signal hot Always use balanced cables when connecting to phantom powered microphones MAKE SURE THAT THE 48V SWITCHES ARE OFF UP POSITION WHEN THE CHANNEL INPUT XLRS ARE CONNECTED TO NON PHANTOM POWERED OR LINE SOURCES If ground loops cause problems connect the cable screen at one end only as described below Balanced outputs may be connected to unbalanced inputs and vice versa by linking the signal cold to OV ground as follows Balanced output to Balanced input Connect cable screen at destination only Balanced output to Unbalanced input Connect screen at source only Link the ve output to Ov at the output connector Unbalanced outp
21. or mixes with metering a a i 0000 tip or pointed object mutes AFL inserts and balanced KLR connec kolololo 2 tors 20 O Set the MONITOR MODE 30 O oe x tch to the d t The REV switches reroute the groups and L R 1 0 O BA i o AP i E z POST p E A below panel for the wedge mix to the aux jack outputs for additional moni 2 9 o gt i monitor output AFL tor or effects sends or as an independent submix post olololo interrupted by PFL facility For example the aux 5 and 6 jack ea ated ioe outputs may provide a separate stereo mix out oojo Set the REV switches to put fed from the channel L R switches and the of foa fo oo Pa down p ae SA additional 4 return line inputs Pe WA Oe a main outputs to provide the To add effects such as delay or ADT to the stage stage monitor sends monitors the signal s may be routed to a group available at the aux jack output using the master LEV to control the send level and returning the effect to an unused channel using the aux send controls to set the required amount of effect to each monitor aa ULI MULTIMODE L M R Front of House system with 4 dedicated stage monitor sends STAGE MONITOR ie STAGE MONITOR groups EFFECTS aux 1 4 ft 200000 coy aux 5 6 ieee coe
22. osition 10 Toute the aux graphic equalisers mix through the main outputs to provide 4 stage monitor sends ULZ RECORDING stereo amplifier LEFT 4 a MUSICIANS CUE MONITOR LOUDSPEAKER SYSTEM AILLLIV ee HEATH stereo and multitrack studio live location audio visual production 4 RIGHT stereo amplifier 4 TRACK MULTITRACK inputs groups Y splitters or repatch leads as required 2 TRACK RECORDER send gt gt return aux 5 COMPRESSOR LIMITERS These are often used in location recording to prevent F unexpected signal peaks overloading the recorder Here a typical small STUDIO RECORDING setup is shown with 4 track multitrack and 2 track master ing recorders ideal for hard disk and DAT recording systems The dedicated 2 track sends or the balanced L R outputs may be used to feed the 2 track Select aux 1 to 4 post fade for the effects processors Two stereo devices are illustrated here with their outputs returned to the stereo channels Additional floating effects devices may be patched into the chan nel or output inserts as shown Select aux 5 and 6 pre fade to provide a stereo cue to the musicians headphones Alternatively these may be set post fade for additional effects and
23. p to two pairs of stereo headphones or monitor speaker systems while displaying the selected source on the L and R monitor meters The peak responding LED bargraph meters are positioned above each group strip Pressing any AFL or PFL switch interrupts left and right of the monitor with the selected signal in mono and displays AFL AFL active LED on or PFL PFL or AFL PFL LED on on both meters Source selection follows this priority PFL overrides AFL overrides 2 TRACK overrides L R PRE overrides L R POST 2 TRACK RECORD AND REPLAY 2 pairs of phono connectors SEND and RETURN allow convenient connection to a 2 track recorder such as cassette or DAT The send may also be used as an additional unbalanced L R output These connections are set as stand ard for low level operation 10dBV For high level recording the balanced L R XLR outputs may be used MONO OUTPUT OPERATING MODE The recessed MONITOR MODE switch determines the function of the balanced mono output For F O H applications switch up the main L and R outputs are summed to drive a centre MONO FILL speaker system Alternatively this output may be used for mono recording or to provide a mono broadcast feed For ON STAGE operation switch pressed this output becomes AFL interrupted by PFL to drive an engineers WEDGE MONITOR system The wedge mix is created by pressing the required aux group AFL switch combination to listen to the monitor send
24. return 1 2 inserts To tune out stage resonances to prevent M dibibiili COMPRESSOR LIMITERS TE i A au otie feedback These may Signal processors such as these are alternatively be positioned on stage in useful to prevent excessive peaks ee j series with the amplifier feeds for overloading the amplification system performer control o o This example shows the GL2 configured to OOS control a Left Centre Right Front of House 9 S yA yA system with 4 full feature stage monitor ooo These switches are sends olololo recessed to avoid i OO O accidental operation Set Aux 1 4 are set pre fade for the monitor Rates using a pen tip or pointed sends so that the send level is not affected by 10 0 O O object the F O H mix s gt E gt Setthe MONITOR MODE 2010 ol oF switch to the up position Aux 5 and 6 are set post fade to access two pre Pelee 5 A m for mono out L R sum 5 effects devices whose outputs are added to solo olol z A post em m m m the L R mix via return inputs 1 and 2 ce ora Set the L and R REV Alternatively these may be returned via the aa switches to the up position channels useful for stereo effects devices a a on fon al for L R F O H feeds The channel and output inserts may be used Set the group 1 4 REV for floating effects and signal processing SAI switches to the down devices such as compressors limiters and p
25. s vac race Oe eur WARNING THIS APPARATUS MUST BE EARTHED GL2 pag 240V AC DISCONNECT AC MAINS INPUT BEFORE REMOVING COVER SOO 40V RQ Tuo cH IS TO REDUCE THE RISK OF FIRE AND ELECTRIC SHOCK 315mA T FUSE DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE SERIAL NUMBER ie MAIN OUTPUTS ANY Leer 13 14 11 12 5 IN LINE IN LINE IN LINE IN LINE IN LINE IN LINE IN LINE IN LINE IN LINE IN PHONES in Q sma Q O O QO O O O O lO og 5 Cr L 2 TRACK nee Sine eee 00 AUX MA A gt senos AUX i 6 f y N A oe a RETURNA gs RETURNA n O gt wars T nenz Y X A y INSERT RETURN 1ff N 397 N j Q inser oO O INSERT RETURN Q Q MULTI OUTPUT SLAVE MULTI INPUT MASTER 4BV sa8v 48v 48V MIC LINE IN MIC LINE IN ap MIC LINE IN a MIG LINE IN D MIC LINE N 5 sa8v MIC LINE IN 6 MIC LINE IN 48V 48V saav MIG LINE N MIC LINE INE 5 f 10 seat 3 isit 8 wet 7 a inseat 5 insert O K N K N 1 O NJI NI A INSERT Anert 3 sear 2 a y aN C iN N N p N yy N p zx seat 4 2 went 1 y MAIN OUTPUTS BALANCED LINE UNBALANCED LINE INSERT BALANCED LINE IN vO TP IN ge out Jj ouT y v SIGNAL LINE 1 10 IN STEREO LINE A IN 4dBu
26. the L R outputs used for cue The additional rear panel phones monitor output feeds the studio reference loudspeaker system to monitor the console signals and recorded tracks without interrupt ing the recording itself For LIVE RECORDING the channel inserts may be tapped link send to return to provide additional pre fade direct feeds to a multitrack Oo o o olaja O O 0 0 Oo ojojo 0 0 Oo OO 0 ojo Oo o o oO 10 O O 20 O O 30 O 40 O O POST To jojojo 50 O O 50 O O PRE to o o o 007010 ola aja Qo a o im OO 0l of oo oo oo Jo aa zA F P line ins returns PATCHED EFFECT o0o0000 MULTITRACKING To monitor the track returns select RET and adjust LEV and PAN for the required monitor mix Alternatively use the channel line inputs if a dedicated musicians cue feed aux 5 6 is required To monitor the group sends to the multitrack select GRP MIKDOWN Use GRP for subgrouping or RET for effects returns Mix the track returns through the channel line inputs Set the REV switches to the up position for group track and L R outputs ai LAD 9xnw LHOly WE ots apo AILIN XnW7e YSLSVAN napre 300W SOLINDW Ox 49D DNOW wa 33044 LHOIY XIW LHOTY
27. tively the console may be adapted for plinth or table top operation 483 19 rack width Provide adequate space behind the rear of 465 the console power unit for ventilation i The panel may feel warm around the mi mi mi Oo o ch Oo Oo o p 488 o 0000000000 o l power unit This is quite normal as the Qo Oo 090000990900 a 4505 chassis acts as a heatsink for the internal oo0o0000 0000 o OnO O O Or O 0 O 6 O OO O power supply components OnO O 00000000 0 o0o00000 000000 00 0 Oo co cD 0 fo t 5 oe eB AA by oO sio The two M3 base securing bolts each side o0o0o0o000C0O0 00 Oa a a OOCOCOCCOOOOCOR OD align with mounting recesses in the rack OOO ONO OA O O Ov Or o n system 317 ii 999999999999773 space 0o00 0000000000 OF Mount the console using 4x M6 bolts each O O O OO O 0 0000000 0 i i F9 g O0 O 0 0 D O 01 side for maximum strength These should 8 0 020202 000p p g Fo D D o be provided by the supplier of the rack kit o 0 o Qa im o 0 o 0 o o o o0 oO oO 00000000000 0f fb fb Eins oO oO O0 A A A oO oO oO cD O A 30 oO oO o aH Mr oH H A Ro oH Be ot of H Aa oO oO oO E E O A O O O O A A j idg The height does not include the control knobs add 20mm or connector nuts add 8mm x x The rack should allow a minimum side to 6 8 8 S 8 Ye 8 be Saga E E S 38 side clearance of 450mm The GL2 has two support feet fitted to the front of the base to s
28. ure continued reliability and exceptional audio performance AILLLIV fe HEATH ULZ 0 dBu 0 775 Volts RMS 0 dBV 1 Volt RMS SPECIFICATION INTERNAL OPERATING LEVEL 2 dBu INTERNAL HEADROOM 23 dB FREQUENCY RESPONSE 20Hz to 20kHz 0 1dB MAX OUTPUTS seee balanced 27 dBu 600 ohms max load unbalanced 21 dBu 2kohms maxload DISTORTION THD 0 01 Line in to mix out at 1kHz All console inputs and outputs are in phase except for the GROUP INSERTS METERS iamini Peak responding bargraph CROSSTALK output mute better than 100 dB at 1kHz OVU 4dBu at XLR outputs channel mute better than 90 dB at 1kHz PEAK LED Turn on 5dB before clipping fader shutoff better than 90 dB at 1kHz SIG LEDS wa dynamic responding Turn on at 20dBu i NOISE 22Hz to 22kHz Width 19 0 standard 19 rack Pr 483mm MIC EIN 127 5 GB into 150 ohms ii 488mm Height 19 2 11U rack space LINE pre amp at 0dB 88 dBu Depth 90mm MIX noise 85 dB ref OVU weight packed POWER REQUIREMENTS 50 60Hz 40W max CONSTRUCTION All metal chassis Mains voltage set for local requirements Standard 19 rack mount in 11U space Single front panel with individual removable circuit assemblies Removable base for service access Removable internal power supply unit PHANTOM POWER 48V DC 50mA Channel XLR inputs individually switched REPLACE FUSE WITH SAME TYPE AND RATING AS INDICATED ZX wi
29. ut to Balanced input Connect cable screen at destination only Link the ve input to 0V at the input connector ADJUSTING THE LEVELS For best performance it is important that the console signal levels are adjusted for normal operating level If too high the signal peaks will be clipped resulting in a harsh distorted sound and if too low the signal to noise ratio is reduced resulting in excessive background hiss For best results operate the console with the output meters averaging 0 or just below and allowing the occasional high level passage to rise into the red This results in a nominal console output level of 4dBu with ample internal headroom of 4234B to allow for the peaks It is advisable to use an attenuator pad if you are connecting the outputs to equipment which does not have input level controls and operates at a much lower level Simply reducing the fader settings and hence meter levels to compensate may result in excessive background noise and breakthrough due to the reduced signal to noise ratio The same applies to the console monitor output used to check the console signals through reference loudspeakers The monitor amplifier should be matched to the console such that normal control room listening levels are achieved with the monitor LEV control set around position 5 to 7 Operating at a lower position say 2 or 3 degrades the output signal to noise ratio and may result in audible hum and noise The console P
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