5
A
INPUT ANALOG SWITCHES
This row of four green LED illuminated switches is for selecting be-
tween and monitoring any of the analog sources connected to the m904.
B
INPUT DIGITAL SWITCHES
This row of four green LED illuminated switches is for selecting be-
tween and monitoring any of the digital sources connected to the m904.
C
MUTE SWITCH
The mute switch is used to fully mute the control room (speaker) output from the
m904. The red switch LED illuminates when active.
D
MONO SWITCH
Pressing this green illuminated switch mono sums the stereo left and right chan-
nels.
E
DIM SWITCH
this switch reduces the monitoring level of the currently selected speaker output set
by up to 35dB (user calibrated).
F
MON > CUE SWITCH
The MON > CUE switch is an illuminated switch used for routing the selected
stereo input source to the CUE output. In addition, this switch may be configured to access a third
stereo speaker pair output.
G
TALKBACK SWITCH
This red illuminated momentary action switch engages the talkback micro-
phone circuit for as long as the switch is depressed. Releasing the switch disengages talkback. Also,
this switch can set for latch operation in CAL mode.
H
SPKR SEL SWITCH
The speaker select switch is used to toggle between the available speaker out-
put sets. Each press of the switch lights the LED associated with each speaker set (1 or 2).
I
MAIN LEVEL/EDIT ROTARY ENCODER
This stepped rotary encoder controls the main speaker
output levels in .5dB increments. This encoder is also used to adjust level offset calibration values
when in CAL mode. Additionally, double clicking the encoder recalls the stored level preset.
J
HEADPHONE LEVEL ROTARY ENCODER
This stepped rotary encoder controls the headphone
output level in .5dB increments. Additionally, double clicking the encoder alternately mutes or recalls
the stored level preset.
K
HEADPHONE AMPLIFIER JACKS
These ¼” TRS headphone output jacks are provided on the front
panel to access the integrated reference headphone amplifier.
L
POWER / STANDBY SWITCH
M
HEADPHONE LEVEL DISPLAY
This blue, 3 digit headphone level display shows the current rela-
tive headphone output level value based on the position of the headphone level rotary encoder. The
range of this display is 0 to 100dB.
N
MAIN LEVEL/EDIT DISPLAY
This blue, 3 digit main level/edit display shows the current relative
main speaker output level values based on the position of the main level rotary encoder. The range of
this display is 0 to 100dB. The display also shows edit values when the system is in CAL mode.
O
CAL SWITCH
Pressing the CAL switch activates calibration mode on the m904. When CAL mode is
active, the red LED CAL switch will flash. CAL mode is exited by pressing the switch again. Please refer
to the ‘Accessing the CAL MODES’ chapter of this manual for detailed information about m904 system
calibration.
