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Augmenting the already highly successful GB4 console range is the new GB8 8-bus console. The GB4 has found many friends including the Cavern Club in Liverpool, and in use at the Bedford venue in South London.
Available in frame sizes from 16 to 48 channels, each with four full-function stereo channels and four stereo returns, the GB8 is designed for installations such as churches and performance venues, or for small touring sound systems. The dual-mode topology implemented to such success on the MH3 and MH4 desks allows the GB8 to be used on FOH or monitor duties, with fader control of group or aux outputs. Additional features over the GB4 include a 1kHz oscillator and a meter bridge with three led meters that very closely emulate the ballistics of VU meters.
Four mute groups allow several channels to be muted simultaneously, while another unique facility is the limiter on both the Record and Alternate stereo outputs that makes it easier to create a stereo recording of the mix.
The console also features an output matrix with eleven feeds to four outputs, being fed from the group busses and main L, R and C (mono) outputs.
Although largely conventional in layout, the GB8 does have some unique mechanical features. The rugged steel chassis has a sloping rear connector panel so that it is easier to configure from the front of the desk, while the integral power supply has a link option for an external back-up PSU.
Both the GB4 and GB8 desks carry the high quality hallmark with which Soundcraft is synonymous, with engineering and design, as you’d expect from this high-end manufacturer. Careful attention has been given to the mechanical construction, to ensure reliability under strenuous conditions, with all input modules being constructed with individual vertically-mounted pcb’s, fitted to the steel chassis front panel with individually-nutted potentiometers.
The GB Series also shares the stylish looks of the MH4, MH3 and LX7ii consoles, continuing a strong family look and feel across the range.
New GB30 mic preamps and EQ section, designed by Soundcraft co-founder Graham Blyth, owe their design heritage to the MH 3 and MH4 consoles
• New high performance 4-band GB30 EQ
• 4 stereo inputs handle mic or line inputs with 48V and mic amps on each input
• Dual mode operation means console can easily be configured from FOH to Monitor with touch of a button
• 11 true busses including 8 subgroups, left, right and center
• 8 auxiliary sends with flexible pre/post switching
• 4 mute groups
• 11 x 4 matrix allows 4 separate sub-mixes of left, right, center and group outputs
• Internal power supply WITH external PSU link option!
• Direct outputs on every mono channel
• New True VU overbridge monitors left, right and center plus 4 segment LED’s on each input and 12 segment output meters
• Highly stylized design borrowed from the MH Series consoles
MONO INPUT MODULE
A balanced XLR connector accepts balanced or unbalanced mic signals.
A balanced 1/4" jack accepts balanced or unbalanced line level sources, such as keyboards.
+48 Phantom Power
Phantom power is individually switchable on every channel, with front panel LED indication of status.
Phase reverse is individually switchable on every channel.
Precision, low noise mic preamps deliver continuously variable gain between 5dB and 60dB. A Peak LED indicates internal signal levels in excess of +18dBu.
High Pass Filter
A steep 18dB per Octave High Pass Filter is included straight after the preamp to reduce low frequency rumble on stage and clean up vocal performances.
A pre-fade, pre-EQ (but post-HPF) insert point is provided for patching in Limiters, Graphic Equalisers or other signal processors. It may also be used for recording.
A direct output is also available on every mono channel with individual pre/post fader switching situated on the rear panel. This allows the direct outputs to be equally useful for effects send applications or multitrack tape feeds.
GB4 and GB8 incorporate the GB30 4-band equaliser section - based on that used in the high-end MH Series. Both the HF and LF shelving sections have steeper slopes than usual which substantially reduces mid frequency harshness in the HF band and muddiness in the LF. This increase in “cleanliness” of response is further enhanced by an element of undershoot and overshoot in the boost/cut response. It has two swept mid frequencies carefully selected for optimum control during live performances. All bands provide 15dB of cut or boost. The Low frequency equaliser response shelves at 80Hz. The swept Lo Mid control operates between 80Hz and 1.9kHz. The swept Hi Mid control operates at frequencies between 550Hz and 13kHz. The fixed High frequency equaliser response shelves at 13kHz.
The EQ section can be bypassed using the EQ switch, allowing comparison of treated and untreated sounds without having to reset controls.
The GB4 has 8 flexible Auxiliary sends which allow the choice of either monitor or effects orientated mixes. Auxes 1-4 are pre-fader and, in normal operation, are routed to the rotary Aux masters 1-4. In SWAP mode, they are routed to Group faders 1-4 and Group meters 1-4, ideal for monitor mixing applications. Auxes 5 to 8 are pre/post switchable - globally assigned selectable per Aux bus from the Master Section. The GB8’s 8 Auxiliary sends (Fig. 1) are globally selectable per Aux bus between pre/post fade. The Auxes are routed to rotary Aux masters, which all feature SWAP mode.
Level Control and Routing
On the GB4, the signal on each fader can be routed to the L-R mix (via the Pan control), the C (mono) bus and Groups 1&2 and 3&4. On the GB8, the signal can additionally be routed to Groups 5&6 and 7&8
Turning the pan control full left or right enables odd or even groups or the left or right Mix bus to be accessed individually.
Each channel can be soloed pre-fader, post-EQ to check levels. PFL status is indicated via a front panel LED.
Professional grade, 100mm faders provide accurate, consistent control of audio levels and have superb cut-off performance.
A 4-segment LED display on each fader strip provides an instant reference for the signal level on that channel.
STEREO INPUT MODULE
GB4 has two stereo inputs which allow connection of stereo sources, or use as sophisticated effects returns. GB8 has four stere