Allen & Heath Limited, Kernick Industrial Estate, Penryn, Cornwall TR10 9LU, UK
; www.allen-heath.com;
GL2800M Architects Specification
The console shall be fully equipped for engineer driven live sound monitor mixing.
It shall be available in three frame sizes: 24, 32 or 40 channels. Each channel
shall be capable of accepting a microphone or line level signal and mixing to any
combination 16 mix outputs. The console shall provide a dual feed engineer’s
wedge/IEM monitor system as well as stereo headphones.
All channel inputs shall be electronically balanced on 3-pin Neutrik XLRs with gold
plated contacts capable of accepting signals over a 74dB range using a variable
gain control and switched -20dB pad from -60dBu to +14dBu. Maximum input
capability shall be +34dBu. A split output on 3-pin male XLR shall be available to
feed an independent FOH mixer. This shall be by direct pin-to-pin connection with
the input XLR, with a ground lift switch to disconnect the pin 1 link between the
XLRs in situations where venue ground loops cause a problem. The preamp shall
present an input impedance of 2k ohms, include a polarity reverse switch and per
channel switching of +48V DC phantom power to the input XLR via 6.8k ohm series
resistors. A pre-insert switched 100Hz 12dB/octave high pass filter shall be
provided. The channel insert shall be pre-EQ and available from a single TRS jack
socket with tip = send and ring = return operating at nominal 0dBu. A 4-band swept
mid frequency EQ shall provide +/-15dB control of shelving HF and LF at 12kHz and
80Hz respectively, HM swept from 500Hz to 15kHz and LM swept from 35Hz to 1kHz with
LM and HM Q of 1.8. The channel shall provide 16 rotary send controls mixing to
the 16 mix outputs. These shall be configurable globally by the operator using
recessed mode switches in the master section for mono or stereo operation in banks
1-8, 9-12 and 13-16. Additional mode switches shall configure these banks of sends
for pre or post fader operation. Pre-fade sends shall be sourced post-EQ by
default. In stereo mode the controls shall be arranged as separate level and
centre detented pan. The level controls shall adjust from off to +6dB boost. A
60mm fader shall provide an overall level trim of all post-fade mix sends from off
to +6dB boost. The normal operating 0dB position shall be clearly marked. The
channel shall include an illuminated mute switch affecting all the pre and post-
fade mix sends, 4-bar LED pre-fade signal meter, switches to assign the channel to
any combination of the four mute groups, and an illuminated PFL switch to route the
pre-fade, pre-mute signal to the engineer’s monitor system.
The master section shall have the 16 mix outputs available on 3-pin differentially
balanced Neutrik male XLRs operating at +4dBu and able to drive up to +26dBu. Each
master shall provide a polarity reverse switch and a swept frequency high pass
filter ranging from 20Hz to 400Hz to cut low end frequency stage noise. Masters 1-
8 shall in addition provide a 2-band swept mid frequency EQ with +/-15dB cut/boost
over the ranges 80Hz to 2kHz (LM) and 500Hz to 12kHz (HM) with a Q of 1.6 for
adjusting the overall tone of the mix. A 100mm fader shall provide +10dB boost and
a post-fade mute switch shall affect the signal at the mix output. A momentary
switch shall be included so that the level may be attenuated by 6dB while pressed
so providing a dim function to help the engineer identify a feedback or other mix
problem. Each master shall include a post-filter, pre-fade TRS jack insert with
tip = send, ring = return operating at -2dBu for connection of an outboard
equaliser or processor. A 12-bar LED meter shall display the post-mute output
level for each mix. An AFL switch shall send the post-fade pre-mute mix signal to
the engineer’s monitor system. These shall be configurable using recessed mode
switches affecting banks 1-8, 9-12 and 13-16 to route to either the engineer’s mono
wedge or stereo IEM outputs. The AFL switch shall include two LEDs to indicate
which output is active. If a pair of mixes has been configured for stereo
operation then the two AFL switches shall route the signal in stereo when pressed
together. Stereo configuration shall be displayed by illuminating an LED between
the pairs of faders.
The engineer’s monitor section shall comprise three outputs: a mono wedge feed, a
stereo IEM feed and the console headphones amp output. The wedge and IEM monitors
shall have differentially balanced male XLR outputs operating at +4dBu with a
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