GB4 User Guide
Contents
1. wo wa FADER Sn 1008 OdBu TUKES C RM_L m 4508 1 MONSEL 5229 5 9 gt ram 7 5 sa o Bo gt U go 9 CASS 0 9 REN H PHONES 70 9 PFL AFL gt ec lO T AONE gt EMELE BUS MASTER CENTRE INSERT MXC 1 1 wa wa ex cw ped Cy icy te gt PEN 2 28 Y 0 PRMIR a O OdBu 5210 8 2 1 o 9 MI 2 M3 4 PEAK reCTPER O OF GND GND GND GND 24 GB4 User Guide GB4 User Guide Using The Console 26 Mono Input MIC GAIN 1 adjusts the sensitivity of both mic XLR and Line 1 4 jack inputs Both inputs are electronically balanced and are located2. sS UE ue ls LEVEL 1 ho 8 AFL AFL AFL AFL 1 ro 0 10 AUXS AUXG AUX7 AUXG E PRE PRE PRE PRE mm C AUX ho ho 3 4 m STEREO AFL AFL AFL AFL 5 6 RETURN 2 L umer ery o EJ D 1 LIMIT O 7 8 a 6 C C i C C MONITORING 10 10 10 10 Q Q Q O rPFL AFL _ 2TRK AFL AFL AFL AFL TOME GRP AUX SWAI GRP AUX SWAI C ROOM ON ON i 2 c 0 L R L R L R L R GRP PAN GRP PAN GRP PAN GRP PAN H PHONES 0 0 0 0 H 4 5 6 wur 3 E OE ay MONITOR 7 SOURCE 0 10 1 8 TO CENTRE 10 10 10 10 10 10 10 10 10 L L 8 11 851 811 8 1 1 2 0 3 0 3 0 0 0 0 0 0 0 4 4 5 16 5 16 5 5 5 5 5 5 5 8 m ST 1 7 ts imm 410 10 10 _ 10 _ 1201 10 10 10 _ 1 10 1 1 15 15 15 15 15 15 15 15 15 2 2
3. 48V Ca es al P L 12 STE ste MIC 3 PK mic a ste ste Las 2 ann GRP3 GRP4 LEFT RIGHT CENTRE al ll B 8 Ll 18 18 ll 18 B i 15 15 15 15 15 15 15 5 bods 5 42 2 2 2 4 20 9 9 9 9 9 9 9 6 6 6 6 6 6 6 3 3 3 3 3 3 m 3 Ft rn 0 0 0 0 0 0 0 3 3 3 3 3 EJ 3 MONO ME 2 i ES So 25 1 se 25 25 20 27 27 27 207 20 27 Lu wa wa rz LEFT RIGHT 1 MX 1 MX 1 NX 1 NX 1 MX vr UM 5248 5 Q is is Q 8 8 8 8 8 Ei El Q CX Q 8 8 8 8 5 Q x Ei O 8 8 8 5 8 8 z x ak D D T T gt n a 8 8 8 8 8 MTX1 MASTER MTX2 MASTER MTX3 MASTER MTX4 MASTER REC ALT TALKBACK
4. 48 48 48 E CO TO MIC 30 Q MIC 30 Q MIC 30 Q GAN t GAN 7 4 5 b 7 7 une 5 une 5 ung 608 UNE 5 608 UNE 5 608 une 5 608 20 20 20 20 20 20 HI 550 MID 223 10 c l cim l 10 10 cle cle c 10 L L L L L L L L 5 R 5 R 5 815 815 5 5 815 R 1 1 T 1 1 1 1 1 2 2 2 2 2 2 2 2 0 0 0 0 0 0 0 0 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 5 o 8 6 ls neum 5 am 5 E 8 8 8 8 8 ax 0 pam 10 10 10 10 10 jo 10 j _ x Lo M M M M M M 1 1 1 1 1 1 15 15 15 15 15 15 M M M M M M 2 2 2 2 2 2 20 M 20 M 20 20 M 20 M 20 M 3 3 3 3 3 M M M M M 4 4 4 4 4 30 30 30 E cO cO cO 38 GB4 User Guide
5. GND CHASS 5 g a 9 9 gt 20 GB4 User Guide MUTES 1 4 PFL EN MATRIX 1 4 GRP 1 4 RIGHT CENTRE LEFT AUX 5 8 PST AUX 5 8 PRE AUX 1 4 Stereo Input I 1 go 2 re e t gpel 1 mem 1 1Sd exny ONON sais 1 CERTEN WE ape uad ee 0 NUM 30 g liO NI
6. o O e o L gnan anantie 000 090 gt 0 y Quouo gt ouunte 069000009 o 0 079000970 nnnnnnane e 0000 o o 0090 0000 0 900099 gt Dooon unnode eee one 9 LL M o En MM 2575 9e our DIMENSION Y DIMENSON X er 5 4454 a gt Uoooo oo00te nn nnne o o huynh o hi hic nannte 1222 am 00096 20000 D LULU 1911 20000 0000 9 y Hnunr nnimte chien np 2 junun ubuutre nudg aaadtie puri ess 00000 0000 5 25 000059000 00096 00005 gt o Lipaannnnnm 0 acs 000000000 00000000 GB4 CONSOLE OVERALL DIMENSION S FRAME SIZE DIMENSION
7. 4 1 1 1 1 1 340 OIN AL Spec TELE e ull anal L fay 8 1 9 XAV XW T1 XAV Sdnouo ova 995 Hs 22 GB4 User Guide 22 Group Aux Matrix Outputs woe eo 5 GROUP AUX MATRIX OUTPUT cud un Er com INSERT 2224565625 12 SEGMENT LED METER 2220 GRP 1 2 3 4 000000000000 2 Vos 2 lt READING r3 m pod RECTIFIER al 4 A o 58 1 GRP BUS 1 2 3 4 r 3O n ao ri AUX 1 2 3 4 T AL MR END ROTS HAE UNITY MASTER GAIN 5aB DOWN FROM THE TOP GND om AP om S _ LE Nez o MIXI MIX2 MIX3 MTX4 CHASS gt o x 12 34 2 2 20 9 AUX AUX 5 6 7 8 peste A PRE MASTER M sou Th lax ae 9 m L PRE 5 6 7 8 us MATIX MATX 1 2 3 4 MASTER H 5aBu 1508 GND MAK EUS d A CHASS arn ad GB4 User Guide 23
8. o L R L R L R L R GRP PAN GRP PAN GRP PAN GRP PAN 0 E P2 97 ces zs 4 ar AFL AFL AFL 10 10 10 10 10 10 10 5 5 5 5 5 5 5 0 0 0 0 L 0 0 2 SESE SS 16 5 5 5 5 5 5 5 10 10 10 10 10 10 10 15 15 15 15 15 15 15 20 20 20 20 20 20 20 30 30 30 30 30 30 30 5 uli u 30 GB4 User Guide Master Section GROUPS Note that the group controls are swappable with the aux 1 4 controls by pressing the GRP AUX SWAP switches 1 If the contols are swapped the aux and group faders swap function and their respective AFL buttons and the group insert point becomes an aux insert point The 12 segment meter swaps function The group and aux output connectors retain their original function The following description assumes that swap mode is NOT used The GRPx fader 2 controls the level after the insert point This signal is fed to the Group Output XLR on the rear connector panel The 12 segment meter 3 monitors the level after the fader The AFL button 4 feeds the group post fader signal to the monitor output and phones output The post fader signal is routed to t
9. PSU Monitor LEDs These LEDS 39 confirm the presence of the correct voltage on the 48V and the 17V power rails in the console Rear Connector Panel EN EN INS INS ns ms gt QRZ 27 nme EO 0000 R GRP 2 0000 0000 AUX2 e 44 gt gt 22 gt 424 R STERTN2 L STERTNi L AUX8 AUX7 AUX6 AUXS T B MIC 3 pin female XLR Pin1 Ground Pin2 Signal Hot Pin3 Signal Cold MIX L R amp C OUTPUTS 3 pin male XLRs Pin1 Chassis Pin2 Signal Hot Pin3 Signal Cold E L amp C INSERT POINTS 1 4 TRS Jacks Tip Send Signal Ring Return Signal Sleeve Chassis L amp R MONITOR OUTPUTS 1 4 TRS Jacks Tip Signal Hot Ring Signal Cold Sleeve Chassis GROUP 1 4 OUTPUTS 3 pin male XLRs Pin 1 Chassis Pin 2 Signal Hot Pin 3 Signal Cold GROUP 1 4 INSERT POINTS 1 4 TRS Jacks Tip Send Signal Ring Return Signal Sleeve Chassis AUX 1 8 OUTPUTS 1 4 TRS Jacks Tip Signal Hot Ring Signal Cold Sleeve Chassis MATRIX 1 4 OUTPUTS 1 4 TRS Jacks Tip Signal Hot Ring Signal Cold Sleeve Chassis REC ALT OUTPUTS 1 4 TRS Jacks and RCA Phonos JACK Tip Signal Hot Ring Signal Cold Sleeve Chassis PHONO Centre Signal Screen Chassis 2 TRACK INPUTS RCA Phono Centre Signal Screen Chassis STEREO RETURN 1 amp 2 INPUTS 1 4 TRS Jacks Tip Signal Hot Ring Signal Co
10. Master Section MASTER LEFT 1 x 23 EE E E REC ALT 1 EAS amp amp AL lt lt lt 5 L 5 LIMITER S ee or co PHONO 8 22 9 55 83 REC ALT 8 25 da 9 m s 4 pe READING H ND F p Gu Le a lt 9 9 9 9 Ix pa aS REPLAY 9 Q 9 9 MOTOR SMES L on R Mixa LMX FADER dabu vii OB 1 LRO amp CENTRE 9 MASTER RIGHT LMXEUS INSERT
11. 20 20 20 20 20 20 20 20 20 3 3 4 4 IE 5 PFL x eo e 2 x STE1 STE2 CENTRE GB4 User Guide 40 GB4 User Guide
12. DIMENSION X 12CH 729 76mm 627 73mm 16CH 841 52mm 739 49mm 24CH 1065 04mm 963 01mm 32CH 1299 67mm 1197 64mm 40CH 1523 19mm 1421 16mm 18 GB4 User Guide GB4 User Guide Block Diagrams Mono Input MUTES 1 4 PFL EN MATRIX 1 4 GRP 1 4 RIGHT CENTRE LEFT AUX 5 8 PST AUX 5 8 PRE AUX 1 4 AUX AUX AUX6 PR AUX amp PST PRI AUXE PS FI PRE pas EM 5 22 N AUXZ Es OdBu SM s ae 2 LMID 1 8 1508 1598 HMID 13k 550 d HF 1508 15d 19 OdBu OdBu GAIN MUTE PEAK READING RECTIFIER
13. bus is then routed to the following places its main output XLR on the rear connector panel feeds to the matrix 1 4 buses 17 the REC ALT output section MONITOR SOURCE select switches L R 18 and C 19 sum of the L amp outputs can be routed to the C output via the L R TO CENTRE switch 20 REC ALT Outputs The REC ALT output is a stereo pair Each of the 2 channels L amp has 2 output connectors on the rear connector panel an RCA phono socket and a 1 4 jack The three feeds to the REC ALT section are from the L R amp C main faders 16 The C switch 21 feeds the C signal to both L amp R channels The MONO switch 22 sums both the left and right channels together The LEVEL pot 23 feeds the stereo signal to a limiter which can be enabled by the LIMITER ON switch 24 the adjacent LED indicates when the limiter is active The stereo signal is then fed to the rear connector panel Monitoring amp PFL The monitor section feeds the control room L amp R outputs on the rear connector panel and the headphones output right hand front of console The sources for the monitor section are the 2 track input 25 its volume is controlled by the 2 TRK LEVEL control 26 the centre mix 19 and the main mix L R 18 Any or all of these sources may be selected at any one time The monitor signals L amp R are passed to the control room L amp R outputs via
14. loops and inferior earthing systems In some areas especially heavily industrial areas the incoming mains earth will not be adequate and a separate technical earth for all the audio equipment must be supplied However check with your local electricity supply company to ensure that safety regulations are not infringed or negated The successful hum free installation of a system requires forethought and the establishment of a set of ground rules which must be consistently adhered to at all stages of installation 12 GB4 User Guide Initial Wiring Considerations For optimum performance it is essential for the earthing system to be clean and noise free as all signals are referenced to this earth A central point should be decided on for the main earth point system and all earths should be star fed from this point It is common electrical practice to daisy chain the earths to all electrical outlets but this method is unsuitable for audio installations The preferred method is to run an individual earth wire from each outlet back to the system star point to provide a safety earth screen reference for each piece of equipment A separate earth wire should also be run from each equipment rack and area to the star point This may or may not be used depending on circumstances but itis easier to install in the first place than later when problems arise The location of the star point should be a convenient easily accessible place preferably
15. not block any ventilation openings Ventilation should not be impeded by covering the ventilation openings with items such as newspapers table cloths curtains etc Install in accordance with the manufacturer s instructions Do not use this apparatus near water The apparatus must not be exposed to dripping or splashing Objects containing liquid must not be placed on the apparatus The disconnect device is the mains plug it must remain accessible so as to be readily operable in use Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety When the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Only use cables and hardware specified by the manufacturer Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or mois
16. on the rear connector panel The PEAK LED 2 monitors two points in the audio path pre insert point and post EQ The 48V switch 3 applies 48V phantom power to the input XLR An adjacent LED indicates when the phantom power is on The PHASE switch 4 reverses the phase of the selected input HI PASS 5 switches in the high pass filter The module insert point is pre EQ pre fader It is located on the rear connector panel The EQ section 6 is four band with shelving HF and LF and swept peaking high and low mid sections The HF and LF sections give 15dB cut boost at 12kHz and 60Hz respectively The Lo mid section gives 15dB cut boost at 80Hz 1 9kHz The Hi mid section gives 15dB cut boost at 550Hz 13kHz The section is switched in by the EQ switch 7 Signal is sent to the AUX 1 8 busses via individual level pots 8 Aux 1 4 are pre fader signals whilst Aux 5 8 are globally selectable pre or post fade via switches on the master section Signal for the L R main mix 1 2 group busses and 3 4 group busses are routed via the PAN pot 9 The pan pot positions the signal within the stereo image The signal in the module is turned on and off by the illuminated MUTE switch 10 and also the master mutes M1 M4 from the master section if they are selected using the M1 M4 switches 11 Post fader signal level is controlled by a 100mm fader 12 The signal is sent to the stereo mix bus centre bus and 4 group bus
17. the C ROOM level pot 27 and to the headphones socket via the H PHONES pot 28 The monitor L amp R signals can be mono summed using the MNO switch 29 The L amp R 12 segment meters 30 indicate the level of the monitored signal as selected by the monitor source select switches The CENTRE meter 31 monitors the Centre mix output except when any AFL or PFL button is pressed When a PFL or AFL button is pressed the CENTRE meter displays the pfl afl signal level and the pfl afl signal is routed to the control room outputs and to the headphones This signal replaces the normal monitor signal The PFL AFL LED 32 illuminates when this is happening Note the 2 track input may also be routed directly to the main L R mix via the 2 TRK TO MIX switch 33 Master Mutes These four switches 34 will mute any input modules which have been assigned to them GB4 User Guide GB4 User Guide Talkback The talkback mic input is on the rear connector panel The level of the talkback mic signal is controlled by the LEVEL pot 35 The signal is the fed to all groups aux 1 2 aux 3 4 aux 5 6 and aux 7 8 using the appropriate buttons 36 Stereo Returns There are two stereo return channels The connectors are 1 4 jacks on the rear connector panel Each has its own level control 37 and each may be routed to the L R main mix or to groups 1 2 for Stereo Return 1 or to groups 3 4 for Stereo Return 2 via the appropriate switches 38
18. AV3Y Wad 8xnv MS 9018 lad C QPEL 1 SLAW I 184 xv El ngpo ngpe aT SSVHO T 184 9xnv 2 6 to La omi oxnv ngpo I 77 184 XN SSVHO psi FAgps FAgps APS 5 194150 3ud exnv mn Ee 930 Cops PGL PGL 1 1 vXnv 3Nn 1 4 SSVHO exnv 5 m 03 ngpo 5 zxnv 20 kormougapg _ al 51 09 4 dN NTN 3AVH 20 sanas xnv Ty I a 8909 NIYO g O3H31S 21 GB4 User Guide Talkback and Stereo Returns MUTES 1 4 PFL EN MATRIX 1 4 SSVHO TE snax na er s x 808 1 SSYHO re T T g 2449 13 31 BA z1383IS SSVHO SNS XIN gt x H x 1 SSVHO i e NIVO 8 8 T sng 1 808 13 31 B 1138 31 SNYNLIY 038316 4 4 SSVHO
19. GB4 User Guide Soundcraft GB4 User Guide 1 IMPORTANT Please read this manual carefully before using your mixer for the first time This equipment complies with the EMC directive 89 336 EEC Modified by 92 31 EEC 93 68 EEC 91 263 EEC and LVD 73 23 EEC modified by 93 68 EEC This product is approved to safety standards IEC 60065 2001 EN60065 2002 UL6500 7th Edition 2003 CAN CSA E60065 03 And EMC standards EN55103 1 1996 E2 EN55103 2 1996 E2 For further details contact Harman International Industries Ltd Cranborne House Cranborne Road Potters Bar Hertfordshire EN6 3JN UK Tel 44 0 1707 665000 Fax 44 0 1707 660742 e mail info soundcraft com Harman International Industries Ltd 2004 2005 All rights reserved Parts of the design of this product may be protected by worldwide patents Part No ZM0302 02 Soundcrattis a trading division of Harman International Industries Ltd Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor Soundcraft shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual No part of this manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic electrical mechanical optical chemical including photocopying and recording for any purpose with
20. a 0 01 mF capacitor This will present a short circuit at RF frequencies thus lowering the effective shield impedance to ground However at low audio frequencies the reactance of the capacitor will be sufficiently high not to cause an earth loop problem GB4 User Guide 13 Points to Remember In all cases use good quality twin screened audio cable Check for instability at the output Always connect both conductors at both ends and ensure that the screen is only connected at one end Do not disconnect the mains earth from each piece of equipment This is needed to provide both safety and screen returns to the system star point Equipment which has balanced inputs and outputs may need to be electrically isolated from the equipment rack and or other equipment to avoid earth loops Itis important to remember that all equipment which is connected to the mains is a potential source of hum and interference and may radiate both electrostatic or electromagnetic radiation In addition the mains will also act as a carrier for many forms of RF interference generated by electric motors air conditioning units thyristor light dimmers etc Unless the earth system is clean all attempts to improve hum noise levels will be futile In extreme cases there will be no alternative but to provide a completely separate and independent technical earth to replace the incoming noisy earth However always consult your local electricity supply authority to ensu
21. ack plugged in Are the Monitor Phones controls set high enough Is the appropriate monitor select switch pressed Headphones Distorting Are the headphones less than 200Q impedance Is the Phones level set too high Optional External Power Supply Although the GB4 has its own internal power supply an external backup power supply DPS 3 can be connected to provide a backup power supply There is a dedicated connector on the rear connector panel 16 GB4 User Guide Audio Connector Pinouts ALL INPUTS ALL OUTPUTS 3 pole XLR GROUND SCREEN SIGNAL COLD Socket female Plug male SIGNAL HOT Mono input channel s mic input Master section Stereo input channel s mic inputs Mix L Mix R Mix C Grp 1 4 Master section T B mic 14 Stereo Jack Plug used as balanced Input Output All Jacks except headphones and insert points as listed below Mono Input Channel Line Input Direct Output Stereo Input Channel Line Inputs Left amp Right Master Section Left amp Right Monitor Outputs Aux 1 8 Outputs Matrix 1 4 Outputs Rec Alt Outputs Stereo Return Inputs Ring SIGNAL COLD Sleeve GROUND SCREEN 14 Stereo Jack Plug used for Headphones Ring RIGHT SIGNAL Sleeve GROUND SCREEN 14 Stereo Jack Plug used for Insert Point as listed below Mono Input Mix L Mix R Mix C Group 1 4 Ring RETURN SIGNAL Sleeve GROUND SCREEN GB4 User Guide 17 Dimensions
22. at the rear of the console or in the main equipment rack Install separate clean and dirty mains outlets wired individually back to the incoming mains distribution box Use the clean supply for all audio equipment and the dirty supply for all lighting etc Never mix the two systems If necessary to provide sufficient isolation from mains borne interference install an isolating transformer This should be provided with a Faraday Shield which must be connected with earth Never locate the incoming mains distribution box near audio equipment especially tape recorders which are very sensitive to electro magnetic fields Ensure that all equipment racks are connected to earth via a separate wire back to the star point Equipment which has unbalanced inputs and outputs may need to be isolated from the rack to prevent earth loops Audio Wiring Having provided all equipment with power and earthing connections consideration must be given to the method of providing audio interconnection and adequate screening of those interconnections This must be done in a logical sequence to avoid problems and assist in the localisation of problem equipment Connect the FOH or Monitor system to the console and check for any hum buzz or RFI Only when you are satisfied with the quietness of the console and the PA system should you proceed with the next step Connect stereo or multitracktape recorders FX and foldback sends one at a ti
23. be assigned by the End User End Users who are consumers should note their rights under this Warranty are in addition to and do not affect any other rights to which they may be entitled against the seller of the Equipment GB4 User Guide Installation For your own safety and to avoid invalidation of the warranty please read this section carefully SAFETY SYMBOL GUIDE For your own safety and to avoid invalidation of the warranty all text marked with these symbols should be read carefully WARNINGS h The lightning flash with arrowhead symbol is intended to alert the user to the presence of un insulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons CAUTIONS The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance servicing instructions in the literature accompanying the appliance NOTES Contain important information and useful tips on the operation of your equipment HEADPHONES SAFETY WARNING Contain important information and useful tips on headphone outputs and monitoring levels GB4 User Guide 9 IMPORTANT SAFETY WARNINGS THIS UNIT MUST BE EARTHED Under no circumstances should the mains earth be disconnected from the mains lead The wires in the mains lead are coloured in accordance with the following code Earth Green and Yello
24. cates when the phantom power is on The Left PHASE switch 4 inverts the phase of the left channel TheL switch 5 routes the left input signal to both L and R channels in the module The R switch similarly routes the right input signal Pressing L and R together mono sums the input The EQ section 6 is four band with shelving high and low frequencies and peaking high mid and low mid bands The HF control gives 15dB cut boost at 12KHz The LF control gives 15dB cut boost at 60Hz The HM control gives 15dB cut boost at a centre frequency of 2 5kHz and the LM control gives 15dB cut boost at a centre frequency of 450Hz The EQ is switched in by the EQ switch 7 A mono sum of the signal is sentto the AUX 1 8 busses via individual level pots 8 Aux 1 4 are pre fader signals whilst Aux 5 8 are globally selectable pre or post fade via switches on the master section The BAL control 9 allows the stereo image to be balanced between the left and right channels within the module The stereo signal in the module is turned on and off by the illuminated MUTE switch 10 and also the master mutes M1 M4 from the master section if they are selected using the M1 M4 switches 11 Post fader signal level is controlled by a 100mm stereo fader 12 The signal is sent to the stereo mix bus centre bus and 4 group busses using the C L R 1 2 and 3 4 switches 13 Note the use of group 1 amp 2 and group 3 amp 4 as 2 sets
25. he effectiveness and or usability thereof is materially affected the Equipment or the defective component should be returned to the Dealer or to Soundcraft and subject to the following conditions the Dealer or Soundcraft will repair or replace the defective components Any components replaced will become the property of Soundcraft Any Equipment or component returned will be at the risk of the End User whilst in transit both to and from the Dealer or Soundcraft and postage must be prepaid This warranty shall only be available if a the Equipment has been properly installed in accordance with instructions contained in Soundcraft s manual and b the End User has notified Soundcraft or the Dealer within 14 days of the defect appearing and C no persons other than authorised representatives of Soundcraft or the Dealer have effected any replacement of parts maintenance adjustments or repairs to the Equipment and d the End User has used the Equipment only for such purposes as Soundcraft recommends with only such operating supplies as meet Soundcraft s specifications and otherwise in all respects in accordance Soundcraft s recommendations Defects arising as a result of the following are not covered by this Warranty faulty or negligent handling chemical or electro chemical or electrical influences accidental damage Acts of God neglect deficiency in electrical power air conditioning or humidity control The benefit of this Warranty may not
26. he main mix stereo pair via the L R switch 5 and the centre mix via the C switch 6 The Group PAN pot 7 is before the L R switch in the signal path It is used to position the group s signal within the stereo image of the main mix The post fader signal may be routed to any or all of the 4 matrix busses via the four matrix input pots 8 AUX MASTERS 1 4 Aux masters 1 4 are all pre fade feeds from the input modules Each AUX master 1 4 level pot 9 controls the level fed from its own aux bus to its aux output The AFL button 10 feeds the aux post fader signal to the monitor output and phones output AUX MASTERS 5 8 Aux masters 5 8 are each globally selectable to be pre fade or post fade feeds this is done via the PRE 11 switch Each AUX master 5 8 level pot 12 controls the level fed from its own aux bus to its aux output The AFL button 13 feeds the aux post fader signal to the monitor output and phones output MATRIX MASTERS Each MTX MASTER level pot 14 controls the level fed from its own matrix bus to its matrix output The AFL button 15 feeds the matrix master post fader signal to the monitor output and phones output GB4 User Guide 31 32 L R amp C Outputs Each of the 3 main mix busses Left Right and Centre has its own insert point These are located on the rear connector panel Each mix bus has its own Fader 16 following the insert point in the signal path The post fader signal for each
27. ience You are now ready to start building the mix and this should be done progressively listening carefully for each component in the mix and watching the meters for any hint of overload If this occurs back off the appropriate Channel Fader slightly until the level is out of the red segments or adjust the Mix Master Faders This procedure will ensure that the mixer is set up correctly with adequate headroom If more amplification is needed adjust the power amplifier level controls Troubleshooting No Power e mains supply present e _ sthe mains lead firmly connected Check the mains fusing e only one of the power indicators is illuminated consult your Soundcraft dealer Condenser Mic Not Working Is the 48V turned on Is the mic plugged into the Mic input Is the mic cable a balanced 3 wire type GB4 User Guide 15 Meters not showing any signal Has the input gain been set correctly see above Is the source connected to the appropriate input socket for the level of signal Do you have something connecetd on the Inserts and is that external device switched on Are the Master faders set at max are input faders set high enough 15 the channel routed to the output being monitored Is the MUTE switch released on the relevant channels Is the appropriate monitor select switch pressed Is there a PFL AFL pressed on another channel No Mix output Check that the Mix Master Fader is up No Monitor output Is a headphone j
28. it is necessary to move it any distance after installation it is recommended that this packing is used to protect it Be sure to disconnect all cabling before moving If the console is to be regularly moved we recommend that it is installed in a foam lined flightcase At all times avoid applying excessive force to any knobs switches or connectors Power Cable Always use the power supply cable supplied with the mixer the use of alternative cables may cause damage and voids the warranty Warning Inthe event of an electrical storm or large mains voltage fluctuations immediately switch off the mixer and unplug from the mains Signal Levels It is important to supply the correct input levels to the console otherwise signal to noise ratio or distortion performance may be degraded and in extreme cases damage to the internal circuitry may result Likewise on all balanced inputs avoid sources with large common mode DC AC or RF voltages as these will reduce the available signal range on the inputs Note that OdBu 0 775V RMS Refer to the Specifications section for details of input and output levels Mains Installation General Wiring Procedures To take full advantage of the excellent signal to noise ratio and low distortion of Soundcraft consoles care must be taken to ensure that incorrect installation and wiring does not degrade the performance of the desk Hum buzz instability and Radio Frequency interference can usually be traced to earth
29. ld Sleeve Chassis GB4 User Guide TYPICAL SPECIFICATIONS Noise Measured RMS 22Hz to 22kHz Bandwidth Mic unity gain 1500 source impedance Mix Output 40 inputs routed to mix Group Outputs Aux Outputs Matrix Outputs Crosstalk 1kHz typical Input Channel Mute Input Fader cut off Pan isolation Mix route isolation Group route isolation Adjacent channel crosstalk Group to Mix Aux Send pots offness typical Matrix Send pots offness typical Frequency Response Mic Line Input to any output 20Hz 20kHz THD N Mic sens 30dBu 20dBu at all outputs 1kHz CMRR Typical 1kHz Input amp Output Max Levels Mono amp Stereo Mic Inputs Mono amp Stereo Line Inputs Stereo Returns amp Insert Returns Any output Nominal Operating Level Headphone Power Input amp Output Impedances Mic Inputs Line Inputs and Stereo Returns Input channels Insert Return Mix Group Aux Matrix amp Direct outputs Insert sends Recommended Headphone Impedance GB4 User Guide 128dBu lt 82dBu lt 83dBu lt 80dBu lt 89dBu 97dB lt 95dB lt 77dB lt 97dB lt 97dB 99dB 89dB 84dB 89dB lt 1dB lt 0 006 80dB 15dBu 30dBu 20dBu 20dBu OdBu 2x250mW into 2000 10kQ with EQ in otherwise 1500 750 50 6000 35 36 GB4 User Guide GB4 User Guide Mark up Sheets
30. me checking and isolating any connection which degrades performance Connect all other peripheral devices Connect all microphone lines By following this sequence much time and future trouble will be saved and the result will be a quiet stable system Shielding Audio equipment is supplied with a variety of input and output configurations which must be taken into consideration when deciding where the screen connections should be made There are three sources of unwanted signal being impressed on the screen which are as follows Extraneous electrostatic or electromagnetic fields Noise and interference on the earth line Capacitive coupling between the screen and signal wires To minimise the adverse affects of the unwanted coupling to the signal wires it is important that the screen is connected at one end only i e the screen must not carry any signal current Any signal on the wires within the screen will be capacitively coupled to the screen This current will ultimately be returned to the source of the signal either directly if the screen is connected at the signal source end or indirectly via the earthing system if the signal is connected at the signal destination end The indirect connection will cause an increase in high frequency cross talk and should be avoided wherever possible Therefore in general always connect the shield only at the signal source end In high RF areas the screen can also be connected to earth via
31. nce you are ready to set initial positions for the controls on your mixer Set up individual input channel as follows Connect your sources microphone keyboard etc to the required inputs and release the MUTE switches Note Phantom powered mics should be connected before the 48V is switched on Set Master faders at 0 input faders at 0 route the channels to MIX and set power amplifier level to suit the application Provide a typical performance level signal and press the PFL button on the first channel monitoring the level on the bargraph meters Adjust the input gain until the meter display is in the amber section with occasional peaks to the first red LED at a typical maximum source level This allows sufficient headroom to accommodate peaks and establishes the maximum level for normal operation but see note below Repeat this procedure on other channels as required Listen carefully for the characteristic sound of feedback If you cannot achieve satisfactory input level setting without feedback check microphone and speaker placement and repeat the exercise If feedback persists it may be necessary to use a Graphic Equaliser to reduce the system response at particular resonant frequencies Note The initial settings should only be regarded as a starting point for your mix It is important to remember that many factors affect the sound during a live performance for instance the channel EQ settings or even the size of the aud
32. of stereo pairs The feed to the centre bus is a mono sum of the stereo signal 4 segment LED bargraph meter 14 next to the fader meters the signal post EQ pre mute pre fade The meter has a peak type response The PFL switch 15 feeds a mono sum of the pre mute pre fade signal to the monitor output and phones output An adjacent LED indicates when the PFL is on GB4 User Guide GB4 User Guide Rear Connectors MIC INPUT LEFT and RIGHT 3 pin female XLR Pin1 Ground Pin2 Signal Hot Pin3 Signal Cold LINE INPUT LEFT and RIGHT 1 4 TRS Jacks Tip Signal Hot Ring Signal Cold Sleeve Ground 29 GRP2 GRP3 GRP4 CENTRE 18 15 12 Besse 1 Y 7 1 CT D 1 T 7 1 T EJ 7 1 8 8s 8s 8 8s 8s Y 8s 8s MTX1 MASTER 2 MASTER MTX3 MASTER MTX4 MASTER REC ALT OUTPUT en a 41 _ STEREO 3 5 14 ho s c ho 1 5 AFL AFL AFL T Se tet 22 AUXS AUXG AUXT 11 37 1 LIMITER 36 ago LU 38 i 1 m p PFL AFL 40 32 GRP AUX SWAP GRP AUX SWAP GRP AUX SWAP GRP AUX SWAI orm DES DIET ON C ROOM
33. out the express written permission of Soundcraft Harman International Industries Limited Cranborne House Cranborne Road POTTERS BAR Hertfordshire EN6 UK Tel 44 0 1707 665000 Fax 44 0 1707 660742 http www soundcraft com GB4 User Guide GB4 User Guide Contents Introduction Key Features Warranty Installation SAFETY SYMBOL GUIDE IMPORTANT SAFETY WARNINGS Mains Installation WORKING SAFELY WITH SOUND Setting Up amp Troubleshooting Optional External Power Supply Audio Connector Pinouts Dimensions Block Diagrams Mono Input Stereo Input Talkback and Stereo Returns Group Aux Matrix Outputs Master Section Using The Console Mono Input Stereo Input Master Section Rear Connector Panel Specifications Mark up Sheets so 9 10 12 14 16 17 18 19 20 21 22 23 25 26 28 31 33 35 37 NOTE This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipmentis operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the u
34. re that safety regulations are not being infringed WORKING SAFELY WITH SOUND Although your new console will not make any noise until you feed it signals it has the capability to produce sounds which when monitored through an amplifier or headphones can damage hearing over time The table below is taken from the Occupational Safety amp Health Administration directive on Occupational noise exposure 1926 52 PERMISSABLE NOISE EXPOSURE DURATION PER DAY HOURS SOUND LEVEL dBA SLOW RESPONSE 8 90 5 102 DO RO S 0 5 110 lt 0 25 115 Conforming to this directive will minimise the risk of hearing damage caused by long listening periods A simple rule to follow is the longer you listen the lower the average volume should be Please take care when working with your audio if you are manipulating controls which you don t understand which we all do when we are learning make sure your monitors are turned down Remember that your ears are the most important tool of your trade look after them and they will look after you Most importantly don t be afraid to experiment to find out how each parameter affects the sound this will extend your creativity and help you to get the best results Recommended headphone impedance is 200 600 ohms 14 GB4 User Guide Setting Up amp Troubleshooting Initial set up Once you have connected up your system see the sections on connection and wiring earlier in this manual for guida
35. ser will be required to correct the interference at his own expense This Class A digital apparatus meets the requirements of the Canadian Interference Causing Equipment Regulations Cet appareil num rique de la Classe A respecte toutes les exigences du R glement sur le mat riel brouilleur du Canada GB4 User Guide Introduction GB4 User Guide Key Features Thank you for buying the GB4 mixing console its main features are Individually switched 48V phantom power on every mono input module 8 Aux sends 4 Group sends paired 4 Mute Groups 7 4 Output Matrix Limiter on record output New GB30 mic pre amp 4 band GB30 EQ Integral power supply with an external power supply link option All metal TRS jacks and Neutrik XLRs Direct outputs on all mono input channels GB4 User Guide GB4 User Guide Warranty Soundcraft is a trading division of Harman International Industries Ltd End User means the person who first puts the equipment into regular operation Dealer means the person other than Soundcraft if any from whom the End User purchased the Equipment provided such a person is authorised for this purpose by Soundcraft or its accredited Distributor Equipment means the equipment supplied with this manual If within the period of twelve months from the date of delivery of the Equipment to the End User it shall prove defective by reason only of faulty materials and or workmanship to such an extent that t
36. ses using the C L R 1 2 and 3 4 switches 13 Note the use of group 1 amp 2 and group 3 amp 4 as 2 sets of stereo pairs 4 segment LED bargraph meter 14 next to the fader meters the signal post EQ pre mute pre fade The meter has a peak type response The PFL switch 15 feeds the pre mute pre fade signal to the monitor output and phones output An adjacent LED indicates when the PFL is on GB4 User Guide GB4 User Guide Rear Connectors INSERT 1 4 TRS Jack Tip Send Signal Ring Return Signal Sleeve Ground LINE INPUT 1 4 TRS Jack Tip Signal Hot Ring Signal Cold Sleeve Ground MIC INPUT 3 pin female XLR Pin1 Ground Pin2 Signal Hot Pin3 Signal Cold DIRECT OUTPUT 1 4 TRS Jack Tip Signal Hot Ring Signal Cold Sleeve Chassis The DIRECT OUTPUT is normally post fader Pressing the PRE button switches it to pre EQ pre mute pre fader 27 28 oun um 5 20 Stereo Input STE MIC GAIN 1 adjusts the sensitivity of both pairs of Mic XLRs or Line 1 4 jacks inputs Both pairs are electronically balanced and are located on the rear connector panel The PEAK LED 2 monitors both left and right signals after the gain control The 48V switch 3 applies 48V phantom power to the input XLRs An adjacent LED indi
37. ture does not operate normally or has been dropped e recommended that all maintenance and service on the product should be carried out by Soundcraft or its authorised agents Soundcraft cannot accept any liability whatsoever for any loss or damage caused by service maintenance or repair by unauthorised personnel e If a trolley is used to carry this apparatus use caution when moving the trolley apparatus combination to avoid injury from tip over No naked flame sources such as lighted candles or cigarettes etc should be placed on the apparatus Warning To reduce the risk of fire or electric shock do not expose this apparatus to rain or moisture Do not expose the apparatus to dripping or splashing and do not place objects filled with liquids such as vases on the apparatus GB4 User Guide 11 General Precautions Avoid storing or using the mixing console in conditions of excessive heat or cold or in positions where it is likely to be subject to vibration dust or moisture Do not use any liquids to clean the fascia of the unit a soft dry cloth is ideal Avoid using the console close to strong sources of electromagnetic radiation e g video monitors high power electric cabling this may cause degradation of the audio quality due to induced voltages in connecting leads and chassis Caution In all cases refer servicing to qualified personnel Handling and Transport The console is supplied in a strong carton If
38. w Green Yellow US Neutral Blue White US Live Brown Black US As the colours of the wires in the mains lead may not correspond with the coloured markings identifying the terminals in your plug proceed as follows The wire which is coloured Green and Yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol e The wire which is coloured Blue must be connected to the terminal in the plug which is marked with the letter N e Ensure that these colour codings are followed carefully in the event of the plug being changed The wire which is coloured Brown must be connected to the terminal in the plug which is marked with the letter L To avoid the risk of fire replace the mains fuse only with the correct value fuse as marked on the rear panel The internal power supply unit contains no user serviceable parts Refer all servicing to a qualified service engineer through the appropriate Soundcraft dealer 10 GB4 User Guide WARNINGS Read these instructions Keep these instructions Heed all warnings Follow all instructions This unit contains no user serviceable parts Refer all servicing to a qualified service engineer through the appropriate Soundcraft dealer Clean the apparatus only with a dry cloth Do not install near any heat sources such as radiators heat resistors stoves or other apparatus including amplifiers that produce heat Do
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