Allen & Heath Limited, Kernick Industrial Estate, Penryn, Cornwall TR10 9LU, UK
; www.allen-heath.com;
GL3800 Architects Specification
The console shall be an eight group, ten aux mixer with meterbridge, fully equipped
for dual function operation using recessed switches for tamper-proof selection of
operating mode between front-of-house and monitor mixing. Recording facilities
shall be provided via channel direct outputs. Advanced facilities for multi-mode
operation shall be provided to configure the M output as a centre/submix, LR mono
sum or engineers listen wedge, and to reverse the aux outputs with masters on 100mm
faders with inserts and balanced XLR outputs. Two patchable mic pre-amps shall be
available for adding ambience feeds to in-ear monitor mixes or recording mixes
created on matrices. The console shall be fully expandable using a balanced
bussing system to enable mixers from the same manufacturer to be interconnected.
The unit shall be available with 24, 32, 40 or 48 input channels, arranged in one
of the following configurations: all mono inputs; 4 stereo channels to the right of
the master section; 4 stereo channels on the right of the console or 8 stereo
channels on the right of the console.
All external audio connections will be provided on metal-bodied jacks or Neutrik
XLRs with gold-plated contacts. Fully differential balanced connections shall be
provided on the group outputs (XLR), LRM outputs (XLR), all mic inputs (XLR),
mono/stereo channel line inputs (TRS jack) and even-numbered stereo return inputs
(TRS jack). Impedance-balanced connections shall be provided on TRS jack sockets
for aux outputs, matrix outputs, monitor outputs and channel direct outputs. Mono
channels shall handle a maximum input level of +34dBu. 100mm ultra smooth-travel
dual rail faders providing up to +10dBu boost shall be provided on all input
channels, group outputs, LRM outputs and shall be accompanied in each case by
illuminated mute switches and illuminated PFL(inputs) or AFL (outputs) switches,
along with 4-bar LED meters showing pre-fade (input channels) or post-fade
(outputs) signal levels. All balance, pan and cut/boost rotary controls shall be
centre-detented.
Rotary audio control potentiometers will be individually secured to the front panel
using threaded nuts. Internal grounding will be based on a solid copper grounding
strip. All formats will use an external linear power supply unit and allow
simultaneous connection of two identical supplies to provide a redundant backup.
The chassis shall include connections for gooseneck lamps.
Mono input channels shall each feature: mic inputs normalled through the line input
connector; line/pad switch selecting between the two connectors or providing 20dB
pad for the XLR input if the jack socket is unused; input gain continuously
variable in the range +10dB to +60dB (mic) and -10dB to +40dB (line/padded mic);
polarity reverse switch; +48V phantom power switch; 100Hz, 12dB/octave filter with
in/out switch; 4-band parametric EQ with in/out switch. Mono channel EQs shall
provide shelving HF and LF controls at 12kHz and 80Hz respectively and two
sweepable mid-range controls, each with a Q of 1.8 and frequency sweeps in the
range 500Hz to 15kHz (HM) and 35Hz to 1kHz (LM). Mono input channels shall also
feature: 10 auxiliary sends with 1-8 on individual rotary controls, each having a
maximum additional boost of +6dB and 9&10 configured as a stereo pair with level
and pan control; three pre/post fade switches, one for aux sends 1-4, another for
aux sends 5-6 and one for stereo send 9&10; pre-fade aux-sends sourced post-insert,
post-EQ with recessed switch for changing to pre-EQ pre-insert; pre-EQ, pre-mute
TRS insert point; PFL facility; signal meter; pan control for L(odd)/R(even)
adjustment to main mix and groups; routing switches to LR, M, groups 1-2, 3-4, 5-6
and 7-8; channel fader; switches for assignment to mute groups 1-4.
Each stereo input shall feature: a mono microphone input with rotary gain control
adjustable in the range +6db to +60dB; stereo line input with rotary gain control
in the range OFF to +16dB; +48V phantom power switch on mic input along with
line/pad switch, polarity reverse switch and 100Hz 12dB/octave high pass filter
with in/out switch; mic output jack normalled to channel, providing a break point
for patching the mic pre-amp output into other inputs; four-band fixed-frequency
(60 pages)
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(58 pages)
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