Allen & Heath 20 XB-14 MK2 User Guide
TELCO CHANNELS
ON Switch
This mechanically latching switch operates the channel mute circuitry, turn-
ing the signal to the PGM, Audition, MIX B and Aux buses on or off.
The switch is illuminated green when pressed.
There is an option to disable the switch (make permanently ON) using the
option switches on the rear-panel. If this is activated, then the switch will
be illuminated green regardless of whether it is pressed or not.
There is also a remote mute option wired to a D type connector on the
rear panel. When this is wired and operated the REM MUTE red LED illu-
minates and the mute circuit is activated regardless of whether the ON
switch is pressed.
SIGNAL & PEAK LEDs
The Signal LED illuminates when the pre-fader signal level is above –15dB.
The Peak LED illuminates and stays on for around 0.5 seconds when a peak
level is detected (pre-fader signal) within 5dB of clipping.
PFL Switch
The PFL (Pre-Fade Listen) switch sends the channel signal to the PFL bus
and subsequently to the headphones/CRM speakers and the main L R me-
ters. Used for checking the audio signal before raising the fader or switching
on the channel or raising the fader.
Fader
The 100mm fader controls the level of the TELCO channel signal to the left
& right PGM bus, MIX B bus and post fade Aux.
The TELCO channel faders have fader start switching logic signals available
on the rear-panel remote interface connectors for control of external
equipment.
T1
SIGNAL
PFL
PEAK
PGM
FDR
0
5
10
15
20
30
40
50
OO
REM MUTE
AUD
AUDITION Switch
Pressing the audition button illuminates the red LED and switches the sig-
nal from the program bus to the audition bus. The signal is post fade and
follows the PAN control. The AUD switch is after the MIX B switch in the
signal chain and so has no effect on the MIX B selection.
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