Allen&Heath GL4000 USER GUIDE - Manual (Page 12)

11
S
YS
-L
INK
E
XPANDER
O
PTION
Available as a kit to be fitted to the console to expand the busses.
Uses 4 25-pin D-type connectors (input and output A and B).
Operates at -2dBu line level. Refer to your Allen & Heath agent for
further details.
G
ROUP
/A
UX
/L/R/M I
NSERT
S
END
Used to send the output signal to external effects and signal
processing equipment such as graphic equalisers, delays and
compressors, post-mix amp and pre-fader.
3-pole 1/4" jack socket (tip = hot).
Impedance balanced -2dBu 50ohm line level.
G
ROUP
/A
UX
/L/R/M I
NSERT
R
ETURN
Used to return the processed signal from external equipment into
the output audio signal path pre-fader and mix meter.
3-pole 1/4" jack socket (tip = hot). Balanced >10kohm -2dBu line
level.
G
ROUP
/A
UX
/L/R/M M
AIN
O
UTPUT
3-pin male XLR (pin 2 = hot). Electronically balanced 75ohm.
+4dBu line level, +27dBu maximum into 600 ohm load.
Capable of driving long cable runs without loss or interference.
M
ODE
S
WITCHING
Set the underpanel mode switches for the intended console
operation. Some of these affect the way the connectors work. For
full details please refer to the BLOCK DIAGRAM.
OUT REV underpanel mode switch - The Aux XLRs and
inserts can swap with the Matrix and LR2 output jacks for aux
(effects) sends on jacks if required. This also provides matrix and
LR2 outputs on XLRs with inserts for driving speaker systems.
MONO MODE underpanel mode switch - The Mono output
becomes the engineers listen wedge monitor feed when the
console is operated in on-stage monitor mode. However, the Mono
insert remains with the mono mix.
MIX/AUX REV underpanel mode switch - Note that while the
front panel control sections are swapped when the reverse mode
switches are pressed, the signals always appear at their related
connectors, ie. the connectors do not swap.