User Manual
36                GL2400 User Guide 
Aux pre/post EQ
 Factory default for the mono 
channel pre-fade auxes is pre-insert, pre-EQ. This is 
popular with many users mixing monitors from FOH. 
It prevents the channel EQ and inserted 
compressors affecting the monitor mix. Move the 
jumper from A to B to change this to post-insert, 
post-EQ if preferred, for example when using 
corrective EQ affecting FOH and monitors. Note that 
auxes are always post-mute. 
Direct output source Factory default is pre-
fader (as set for the pre-fade auxes). This is 
common for live recording to multitrack. The live mix 
fader movements do not affect the recording. Move 
the jumper from C to D to change to post-fade.  
Post-fade is appropriate when using the output as a 
direct channel effects send. 
Channel Aux pre/post settings Factory 
default is Aux 1-4 = switched, Aux 5-6 = switched 
pre/post fader.   You can change these settings for 
different combinations of permanent or switched 
pre/post fade auxes by repositioning the links. Note 
that these are solder links on the mono channels.  
Refer to the system block diagram to explore the 
possibilities. Make sure you set all mono and stereo 
channels the same. To avoid possible future 
confusion when the console is used by other 
operators, we recommend you only change these 
settings if absolutely necessary. 
Stereo/Mono aux source The stereo 
channels feed the auxes with a mono sum of L+R.  
This can be changed so that L feeds the odd 
numbered auxes, and R the even. This may be 
preferred when using odd/even auxes as stereo 
pairs. Factory default is the mono setting. 
Talkback mic +48V Factory default is +48V 
phantom power turned on for the front panel 
talkback mic XLR input. The option jumper is behind 
the TB mic XLR on the L Master board. If you prefer, 
phantom power can be disabled by repositioning the 
jumper to the GND position. 
Note that phantom power should not harm non-
powered dynamic microphones as long as balanced 
connections are used. 
 WARNING: Do not connect unbalanced 
sources or cables to inputs with phantom power 
selected. To avoid loud clicks do not press the 
TALK switch when plugging or unplugging the 
talkback microphone. 
PRE-INSERT, PRE-EQ
POST-EQ
A=PRE EQ
PREFADE SEL
C=PRE
DIR O/P
DCAB
MONO CH - DIRECT OUTPUT
PRE-FADE
POST-FADE
A=PRE EQ
PREFADE SEL
C=PRE
DIR O/P
DCAB
MONO CH - PRE-FADE AUX SENDS
MONO CH - AUX PRE/POST FADER SETTINGS
AUX 6
SW
PO
PO
SW
53-4
PR
SW
1-2
PR
SW
SW = PRE/POST SWITCH
PR = PRE-FADE
PO = POST-FADE
PR
SW
PR
SW
PR
SW
PR
SW
PO
SW
PO
SW
6 1
A
B
CDEFGHIKLJ
AUX 5 4 3 2
STEREO CH - AUX PRE/POST FADER SETTINGS
CN4
STEREOMONO
PRE-FADE AUXES
CN5
STEREOMONO
POST-FADE AUXES
STEREO CH - MONO/STEREO AUXES
JP2JP1
GND +48V
PHANTOM POWER
L MASTER - TALKBACK +48V










