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Along with our wide range of monitors, sometimes it is more suited to monitor mix local to the performers. This Allen & Heath system allows fully eq'd monitoring for up to 12 monitor mixes!











Input / Output  (16 In 12 Out)
+ Splitter Output to FOH + Inserts 


+48V Switches +48VDC to the channel input XLR for powering 
microphones or DI boxes that need phantom power. The power is
current limited through 6k8 ohm resistors to pins 2 and 3.

WARNING: Do not connect unbalanced sources or cables
to inputs with phantom power selected. To avoid loud clicks
always mute the channel before switching +48V on or off and
when plugging or unplugging microphones.

PAD (LINE) Press to switch in a 20dB attenuator pad between the
channel XLR input and the preamp. Use with line level or hot
microphone signals.

GAIN Adjusts the input sensitivity to match the connected source to
the internal 0dBu operating level of the channel. Provides a variable
50dB range from +10 to +60dB gain (mic), or -10 to +40dB (line, pad
selected). The gain should be set using PFL so that the console
meters average ‘0’ with loudest moments lighting ‘+6’. Reduce gain if
the red peak indicator lights.

HPF Switches in the channel high pass filter. This attenuates
frequencies below 80Hz by 12dB per octave. The filter is pre-insert,
pre-EQ. Select the HPF to reduce low frequency noise such as
microphone popping, stage noise and tape transport rumble.

EQ A 4-band semi parametric EQ provides independent control of
four frequency bands. HF and LF are shelving filters which affect high
frequencies above 12kHz, and low frequencies below 80Hz
respectively. HM and LM are bell shaped peak/dip filters which affect
frequencies around a centre point which can be swept from 500Hz to
15kHz and 35Hz to 1kHz respectively. These have a width (Q) of 1.8.
All bands can be boosted or cut by up to 15dB and have a centre
detent 0dB position.

Check for the best microphone selection and placement before using the EQ. Start with the EQ set flat and apply only as much boost or cut
as is really needed. When dealing with problem frequencies cut rather than boost where possible


MIX SENDS These rotary controls adjust how much channel signal
is sent to the 12 mix outputs. Each has its own control. They adjusts
from fully off to +6dB boost. Unity gain 0dB is marked at 3 o’clock
position. Factory default settings should satisfy the most common

All sends = Post-EQ
Sends 1-4 = Switched pre/post using POST/PRE switch
Sends 8-12 = Post-trim (post-fade)

Some of these settings may be changed if preferred by soldering
internal jumper link options. Refer to the system block diagram for
further information on these options. This work should be referred to
an authorised Allen & Heath service agent..

POST/PRE When pressed, the pre-trim (fade) channel signal is
sent to auxes 1-4. When released the post-trim signal is sent.
In monitor mixing, the channel sends are usually set post-trim. This
means the channel trim control (fader) can be used as a master level
for that source feeding all mixes.

Stereo or Mono Odd/even pairs of mixes can be configured for
mono or stereo operation by setting a recessed mode switch near the
master faders. In MONO mode two independent sends are available.
In stereo mode, the odd numbered send becomes a stereo level
control and the even send becomes a pan control to position the sound
within the stereo LR image. Any combination of mono and stereo
mixes may be configured. Before starting, configure how you want the
console to work by setting the STEREO switches in the master section.
MUTE When pressed the channel signal is turned off. This affects
the feed to all mixes but does not affect the insert send. The red
indicator lights when the channel is muted.

CHANNEL TRIM This is the channel fader. Use the control to
adjust the level feeding all post-trim mix sends. It lets you make an
adjustment to compensate for a change in source level, to make a
quick level change affecting all mixes, or deal with a problem such as
feedback. Alternatively you could use it to create a starting point mix
for several monitors. For normal operation, start with CH TRIM set to
its 0dB (unity gain) position (3 o’clock – marked with an arrow).

PFL Press PFL to listen to the pre-trim channel signal in the
headphones and local engineer’s monitor without affecting the mix
outputs. The PFL signal overrides and currently selected mix AFL
signal. The console monitor LR meters display the channel signal.
The red PK indicator half lights to show that PFL has been selected on
that channel. Selecting more than one PFL at the same time mixes
those signals together in the monitor.

PEAK The red indicator illuminates when the channel signal is
within 5dB of clipping. This gives you enough warning to reduce the
GAIN control before you hear signal distortion. It senses the audio at
three points in the signal chain – pre-insert, pre-trim and post-trim.

SIGNAL The green signal presence indicator lights when the
channel pre-fade signal is greater than -12dBu.

MUTE Turns off the mix output. Affects the meter but does not
affect the mix AFL function. This means you can mute the output while
checking the post-fade mix signal using the console headphones and
engineer’s monitor output.

AFL Listen to the mix output in mono or stereo. Routes the postfade,
pre-mute mix output to the engineer’s monitor system. The
yellow LED lights when AFL is selected. If two mixes are configured
as a stereo pair, pressing one AFL checks that mix in mono, and
pressing both AFL together checks the mix in stereo in the
headphones and monitor outputs.

PEAK The red indicator illuminates when the mix signal is within
5dB of clipping. This gives you enough warning to reduce the level
before you hear signal distortion. It senses the audio at two points in
the signal chain – pre-insert and post-fade.
SIGNAL The green signal presence indicator lights when the mix
post-fade, post-mute signal is greater than -12dBu.

STEREO mode switch Pressing the switch configures the
related odd/even numbered mixes for mono or stereo operation. In
MONO mode (switch flush with panel), two independent mono mixes
are provided. In STEREO mode (switch below the panel), the top (odd
numbered) channel send becomes the stereo send level control, and
the lower (even numbered) control becomes the pan control to position
the signal between L and R within the stereo image. The switch is
recessed below the panel to protect it from accidental operation. Use
a pen or pointed object to change the setting.

FADER A 60mm fader provides accurate control of the mix output.
Boost of +10dB is available above the nominal ‘0’ position. For normal
operation the fader should be operated around its ‘-10’ to ‘0’ position.
If the fader needs to average higher or lower than this check the gain
structure between the console and the connected equipment.


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