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adjusting the headphone level offset. The level offset range is +/- 20dB in 0.5dB steps.
PRESET LEVEL -
This parameter sets the headphone output preset level. Available range is 0-100 in 0.5dB
steps. The default is 0.0.
PWR UP LEVEL (GLOBAL) -
This parameter sets the headphone output level that is set when the system is
powered on. Available range is 0-100 in 0.5dB steps. The default is 0.0.
EXCLUSIVE OUTPUT MODE -
The exclusive output mode allows the user to easily switch between speaker
and headphone monitoring without having to mute the unused output. When exclusive output mode is
enabled, and headphones are active, the speaker mute and dim controls will also affect the headphone
output level. Pressing the knob toggles the active / muted output. Available options for exclusive output
are disabled and enabled. The default is disabled.
MONO CONTROL -
When mono is turned on, all monitor paths sum the left and right channels to mono.
There may be a case where the user wishes to keep the headphone signal stereo even when mono is en-
gaged for the main speaker systems. Available options are to disable the mono control (headphones stay
stereo even when mono is turned on) and enabled (headphones sum to mono when mono is turned on).
The default is mono control enabled.
HEADPHONE SOURCE SELECT -
From the factory, the headphone output is configured to follow the input
monitor source. Internal jumpers can be configured to feed the headphone output with the CUE signal
(post talkback summing). This allows the m905 headphone amplifier to be used as a headphone monitor-
ing system for the studio. To listen to input sources other than the CUE input pres the MON>CUE button.
To configure the headphone source, move jumpers JP1 and JP2 on the main pcb inside the m905 (see
m905 MAIN PCB Jumper Locations,
page 40
)
Disconnect the m905 from its AC power by unplugging the AC power cable. Use a #2 Phillips screw-
driver to remove the top cover from the m905. There are 8 screws to remove on the top cover, 4 on the
top and 2 on each side. Be careful to discharge any static electricity on the outside of the chassis before
touching any of the jumpers inside the m905.
VOLUME KNOB (GLOBAL) -
This parameter configures the volume knob for standard or coarse/fine opera-
tion. In standard operation the volume control starts with 0.5dB steps when turned slow and increases
with the rate the volume knob is turned. In coarse/fine mode, the volume control covers the entire range
in a single rotation. Pressing the volume knob down while changing volume enables fine 0.5dB step
changes. This parameter is global for speaker and headphone volume control. The default is ‘standard’.
TALKBACK SETUP
From the setup screen, pressing the talkback button enters talkback setup mode. Once talkback setup
mode is active, pressing the talkback button will have the same function as it does in normal mode.
The m905 features a flexible talkback system for communicating with the performers. Two different
talkback sources are available - 1) Built-in mic on the RCU and 2) external mic input on the ACU. Each
of these have independent controls and setup. When talkback is active, the talkback signal is summed
into the cue output. In addition, a dedicated balanced analog talkback output is available on the ACU
that allows the talkback signal to be routed to other systems. Talkback setup parameters are as follows:
RCU MIC GAIN -
This parameter sets the gain of the internal RCU talkback mic. The available range is 0dB to
+63dB in 1dB steps. The default is 0dB.
EXT. MIC GAIN -
This parameter sets the gain of the external ACU talkback mic. The available range is
+15dB to +70dB in 1dB steps with one gain setting of +7dB. The default is +7dB.