GB8 User Guide GB8 User Guide 1
IMPORTANT Please read this manual carefully before using your mixer for the first time. © Harman International Industries Ltd. 2004 All rights reserved Parts of the design of this product may be protected by worldwide patents. Part No. ZM0308-03 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 5 6 7 Installation 9 SAFETY SYMBOL GUIDE Fitting the GB8 Meterbridge IMPORTANT SAFETY WARNINGS Mains Installation WORKING SAFELY WITH SOUND Setting Up & Troubleshooting Optional External Power Supply Audio Connector Pinouts Dimensions 9 10 11 13 15 16 17 18 19 Block Diagrams 21 22 23 GB8 User Guide Using The Console 25 Mono Input Stereo Input Master Section Rear Connector Panel 26 28 31 33 Typical Specifications 35 Mark-up Sheets 37 3
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.
Introduction GB8 User Guide 5
Key Features Thank you for buying the GB8 mixing console. its main features are: Dual purpose console. Individually switched 48V phantom power on every mono input module. 4 STE channels per frame size. 8 Aux sends (all switchable between pre/post fader operation). 8 Group sends (paired). 4 Stereo returns. 4 Mute Groups. 11x4 Output Matrix. Limiter on Record Output and Alternative Stereo Output. GB30 mic pre-amp. 4-band GB30 EQ. Meter Bridge with accurate VU meters for LEFT, RIGHT and CENTRE Outputs.
Warranty 1 2 3 4 5 6. 7. GB8 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.
GB8 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 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.
Fitting the GB8 Meterbridge The meter bridge is packed at one end of the box, within a cut-out in the protective foam packing material. There are also 5 screws provided in a bag. Ensure that the GB8 is disconnected from the mains before fitting the meter bridge. First you need to connect the ribbon cable. Position the meter bridge as shown in Fig. 1 below. This will allow you to connect the meter bridge's ribbon cable to the matching connector in the GB8.
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: l 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.
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.
Audio Connector Pinouts 18 GB8 User Guide
Dimensions GB8 User Guide 19
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Block Diagram GB8 User Guide 21
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GB8 User Guide 23 GB8 User Guide 23
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Using The Console GB8 User Guide 25
Mono Input 3 4 1 5 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. 2 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.
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 1 Pin 2 Pin 3 MIC PRE DIR pin female XLR) Ground Signal Hot 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-Insert Point.
Stereo Input 3 4 STE 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. 2 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. 5 The Left PHASE switch (4) inverts the phase of the left channel.
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 GB8 User Guide 29
34 3 8 35 17 25 12 13 14 15 11 9 10 1 6 5 7 30 21 22 23 40 24 39 27 26 28 41 37 42 36 33 31 30 32 4 29 19 18 20 2 16 38 GB8 User Guide
Master Section GROUPS Note that the group controls are swappable with the aux 1-8 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).
Master Mutes These four switches (38) will mute any input modules which have been assigned to them. Talkback/Ocsillator The OSC 1kHz switch (39) selects the oscillator or the talkback mic input socket as the signal source. The LED next to the switch indicates when the oscillator is selected. The talkback mic input is on the rear connector panel. The level of the talkback mic/oscillator signal is controlled by the TALKBACK/OSC LEVEL pot (40).
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 1-8 OUTPUTS (3-pin male XLRs) Pin 1 Chassis Pin 2 Signal Hot Pin 3 Signal Cold GROUP 1-8 INSERT POINTS (1/4” TRS Jacks) Tip Send Ring Return 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
TYPICAL SPECIFICATIONS Noise: Measured RMS, 22Hz to 22kHz Bandwidth Mic E.I.N. @ unity gain,150Ω 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.
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Mark-up Sheets GB8 User Guide 37
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GB8 User Guide 39
GB8 User Guide
