GB4 User Guide GB4 User Guide 1
IMPORTANT Please read this manual carefully before using your mixer for the first time. © 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 Soundcraft is 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.
Contents Introduction Key Features Warranty GB4 User Guide 5 6 7 Installation 9 SAFETY SYMBOL GUIDE IMPORTANT SAFETY WARNINGS Mains Installation WORKING SAFELY WITH SOUND Setting Up & Troubleshooting Optional External Power Supply Audio Connector Pinouts Dimensions 9 10 12 14 14 16 17 18 Block Diagrams 19 Mono Input Stereo Input Talkback and Stereo Returns Group/Aux/Matrix Outputs Master Section 20 21 22 23 24 Using The Console 25 Mono Input Stereo Input Master Section Rear Connector Panel 26
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.
Intr oduction Introduction GB4 User Guide 5
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.
Warranty 1 2 3 4 5 6. 7. GB4 User Guide 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.
GB4 User Guide
Installa tion 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.
IMPORTANT SAFETY WARNINGS THIS UNIT MUST BE EARTHED Under no circumstances should the mains earth be disconnected from the mains lead.
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 not block any ventilation openings.
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.
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.
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.
Setting Up & Troubleshooting Initial set-up Once you have connected up your system (see the sections on connection and wiring earlier in this manual for guidance) 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.
Me wing an Metter erss no nott sho showing anyy 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.
Audio Connector Pinouts GB4 User Guide 17
Dimensions 18 GB4 User Guide
Bloc k Dia grams Block Diag GB4 User Guide 19
Mono Input 20 GB4 User Guide
GB4 User Guide 1 MIC CHASS LINE CHASS 3 MIC 2 1 CHASS LINE CHASS 3 PUSH 2 STEREO INPUT +48 PEAK READING RECTIFIER +48v +16 +8 0 -10 10dB 0dBu 0dBu BAL GAIN 60dB PFL -3dBu PEAK DETECT L MUTE BLOCK WITH MUTE SW & GROUP MUTE SWITCHES AS ON MONO INPUT MONO -3dBu R +3dB HF -15dB +15dB HF LMID FDR LMID -15dB +15dB C HMID -15dB +15dB HMID LF +13dB +13dB -15dB +15dB LF L-R 0dBu 0dBu EQ 0dBu +3dB 1-2 ALL AUX SENDS HAVE UNITY GAIN LINE UP -5dB FROM TOP 3-
R L R L 1 CHASS 3 CHASS CHASS STE RET 2 CHASS CHASS 0dBu STE RET 1 STEREO RETURNS 2 TB MIC PUSH TALKBACK 0dBu OFF TALKBACK LEVEL +38dB RET 2 LEVEL 8dB GAIN AT TOP RET 1 LEVEL R MIX BUS 3-4 L-R GRP4 BUS L MIX BUS GRP3 BUS R MIX BUS 1-2 L-R GRP2 BUS L MIX BUS GRP1 BUS GROUPS AUX 1-2 AUX 3-4 AUX 5-6 AUX 7-8 Talkback and Stereo Returns MUTES 1-4 MATRIX 1-4 PFL/EN GRP 1-4 RIGHT CENTRE LEFT AUX 5-8 PST AUX 5-8 PRE AUX 1-4 GB4 User Guide
Group/Aux/Matrix Outputs GB4 User Guide 23
Master Section 24 GB4 User Guide
Using The Console GB4 User Guide 25
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 located on the rear connector panel. 1 3 4 48V MIC GAIN 30 PK 1 LINE = 5 -20 60dB 5 100Hz HF - 0+ 3 3 6 9 The 48V switch (3) applies 48V phantom power to the input XLR. An adjacent LED indicates when the phantom power is on. 12 12 15 15 HI-PASS (5) switches in the high-pass filter. 3k The module insert point is pre-EQ , pre-fader.
1 INS LINE 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) Pin 1 Ground Pin 2 Signal Hot Pin 3 Signal Cold MIC PRE DIR 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.
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. STE1 3 4 48V L STE MIC GAIN PK 30 5 LINE = -20 L The PEAK LED (2), monitors both left and right signals after the gain control. 1 The 48V switch (3) applies 48V phantom power to the input XLRs. An adjacent LED indicates when the phantom power is on.
STE1 L LINE R Rear Connectors MIC INPUT LEFT and RIGHT (3 pin female XLR) Pin 1 Ground Pin 2 Signal Hot Pin 3 Signal Cold LINE INPUT LEFT and RIGHT (1/4" TRS Jacks) Tip Signal Hot Ring Signal Cold Sleeve Ground MIC L MIC R GB4 User Guide 29
31 3 8 17 23 14 15 11 12 13 9 10 1 6 5 7 30 21 35 22 37 41 39 24 36 38 33 40 32 29 27 26 28 4 25 19 18 20 2 16 34 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 12segment meter swaps function.The group and aux output connectors retain their original function. The following description assumes that swap mode is NOT used.
L, R & 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 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, • the MONITOR SOURCE select switches L-R (18) and C (19).
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.
MIX L, R & C INSERT POINTS (1/4” TRS Jacks) Tip Send Signal Ring Return Signal Sleeve Chassis L & 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 C
TYPICAL SPECIFICA TIONS SPECIFICATIONS Noise Measured RMS, 22Hz to 22kHz Bandwidth Mic E.I.N.
GB4 User Guide
Mar k-up Sheets Mark-up GB4 User Guide 37
1 1 48V MIC GAIN 48V 30 PK LINE = 5 -20 MIC GAIN - 0+ 3 30 HF 3 - 0+ 3 PK MIC GAIN HF 3 - 0+ 3 30 PK MIC GAIN HF 3 - 0+ 3 30 PK MIC GAIN HF 3 - 0+ 3 30 PK MIC GAIN HF 3 - 0+ 3 30 PK MIC GAIN HF 3 - 0+ 3 PK 60dB 100Hz HF 3 6 6 30 LINE = 5 -20 60dB 100Hz 6 6 48V LINE = 5 -20 60dB 100Hz 6 6 1 48V LINE = 5 -20 60dB 100Hz 6 6 1 48V LINE = 5 -20 60dB 100Hz 6 6 48V LINE = 5 -20 60dB 1 - 0+ 3 3 6 6 6 9 9 9 9 9 9 9 9
STE1 STE2 48V 48V L L STE MIC GAIN 5 LINE = -20 STE MIC GAIN PK 30 60dB 5 LINE = -20 60dB L L MONO MONO R HF R - 0+ 3 HF 3 6 12 15 - 0+ 3 9 9 12 12 15 3 6 9 12 15 HM 3 6 - 0+ 3 6 6 9 HM PK 30 15 - 0+ 3 3 6 6 6 9 9 9 9 12 12 12 12 15 LM 15 - 0+ 3 15 LM 3 6 15 - 0+ 3 3 6 6 6 9 9 9 9 12 12 12 12 15 LF 15 - 0+ 3 15 LF 3 6 15 - 0+ 3 3 6 6 6 9 9 9 9 12 12 12 12 15 15 15 EQ 15 EQ AUX1 AUX1 0 PRE 0
GB4 User Guide
