User manual SOUNDCRAFT GB SERIES BROCHURE

[. . . ] TYPICAL SPECIFICATIONS Frequency Response THD + N Noise Mic/Line Input to any output, 20Hz - 20kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30dBu, +20dBu at all outputs @1kHz . . . . . . . . . . . . . . . . . . . . . . . . . . <0. 006% Measured RMS, 22Hz to 22kHz Bandwidth Mic E. I. N. @ unity gain, 150 source impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Like all GB series mixers, the GB4 uses GB30 mic preamps which use local linearisation techniques rather than global feedback to deliver an extremely open frequency response and excellent phase linearity. The GB30 EQ borrows the innovative designs developed for the Soundcraft MH4 console, providing GB users with the benefits of genuine high-end equalisation. And thanks to a meticulous `ground-up' approach to circuit and mechanical design, the GB Series exhibits class-leading noise performance and channel isolation figures. When it comes to recording a performance, the GB4 & GB8 are similarly well equipped with pre-/post-fader switchable direct outputs on every channel and a high-quality limiter on dedicated record outputs fed from the L-R mix bus. GB4 FEATURES: · 12, 16, 24, 32 and 40 channel frame sizes · 15 busses · 2 full feature stereo channels · 2 stereo returns · 8 Aux sends (4 are pre/post switchable) · 4 sub groups (SWAP with Auxes 1-4) · 7x4 output matrix · Record output with limiter · GB30 mic preamp and precision equalisation circuitry · Direct outputs on every channel · Talkback facility · 100mm faders · Switchable 48V phantom powering on every channel · 18dB/octave high pass filter · 4 mute groups · 12-segment LED metering Dedicated record outputs with a high-quality limiter are fed from the L-R mix bus. SMALLER SCALE MIXING, WITHOUT THE COMPROMISES Available in 16, 24 and 32 channel configurations, the GB2 is designed for installed sound and A/V applications that don't require all the sophisticated functionality of the GB4 and GB8. However the GB2 is a genuine GB Series console in every respect, with sound quality assured by GB30 Mic Pre and Equaliser designs, and reliability by the same rugged build quality that has made the GB4 and GB8 so dependable in demanding professional applications. Along with six Aux busses and an integral 6 x 2 matrix, four subgroups are provided as two stereo pairs, with a unique facility for adjusting the width of the stereo signal across the stereo mix. The channel pan settings are retained on the group outputs, while the degree of stereo separation to the mix bus is independently adjustable from full stereo through to mono. The GB2 also features two stereo input channels, with separate mic and line inputs. In normal use, the mic inputs are routed to the local channel and the line inputs act as a stereo return to the mix bus. Selecting the line input to the local channel overrides the mic inputs. GB2 FEATURES: · 16, 24, 32 channel frame sizes · 12 busses · 2 full feature stereo channels · 2 stereo returns (on stereo channels) · 6 Aux sends · 4 sub groups (paired) · 6x2 output matrix · GB30 mic preamp and precision equalisation circuitry · Direct outputs on every channel · Talkback facility · 100mm faders · Switchable 48V phantom powering on every channel · 100Hz high pass filter · 12-segment LED metering · Record output Line inputs on the stereo channels can also act as a stereo return. GB8, GB4 & GB2 INPUTS MONO INPUT MODULE Mic Input A balanced XLR connector accepts balanced or unbalanced mic signals. GB4 OUTPUTS & MASTER 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 (Fig. On the GB2, the signal can be routed to the L-R mix, and Groups 1&2 and 3&4 (Fig. 4). GROUP SECTION Group Outputs Each Group has an impedance-balanced XLR output connector, allowing long cable runs on stage. Rec/Alt Output GB4 has a single Rec/Alt section. Outputs are provided on impedance balanced 1/4" jacks and unbalanced -10dBv phono connectors. They provide a post-fade send from the L-R mix. The C (mono) bus may be added and/or the mix can be mono summed. A headphone jack is provided for use with headphones with impedances of 100 Ohms or greater. Both the control room and 2-track return levels can be altered using the associated controls. It is also possible to replace the Mix output signal with the 2-track return by pressing "2 TRK TO MIX". This allows easy playing of pre-show music at a single button press, without having to make any alterations to the band's settings. STEREO INPUT MODULE The stereo inputs (2 on the GB2/4, 4 on the GB8) allow connection of stereo sources, or use as sophisticated effects returns. The stereo input channels share all features with the mono input channels, with the exception of the following: Auxiliary Masters The level at each Auxiliary output (balanced jack) on the rear panel is controlled by a rotary control with a button for AFL. Insert 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. Group/Aux SWAP GB4 has four push buttons which swap the functions of Auxiliary 1-4 master rotary controls and Group master faders. NB: The 12-segment peak reading bargraph meters always display the signal selected to the Group faders, i. e. [. . . ] A rotary control governs talkback level. Group/Aux SWAP GB8 has eight push buttons which swap the functions of Auxiliary 1-8 master rotary controls and Group master faders. NB: The 12-segment peak reading bargraph meters always display the signal selected to the Group faders, i. e. Groups in normal operation, or Auxes when used in SWAP mode. Group Metering Selectable 12-segment peak reading bargraph meters. Stereo Returns Stereo returns are accommodated via the stereo inputs. These can be switched for simultaneous mic/stereo return use, or for line inputs (see inputs). Matrix Assignment One rotary control per Group allows individual assignment to Matrices 1-2. MASTER SECTION Rec/Alt Output GB8 features separate Record and Alternate output sections. [. . . ]