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Figure 1 - AT-MX381 Front Panel - Control Layout (Page 71)
1.
Input Trim Control
– (Outer knob)
Adjusts the input signal sensitivity for the channel.
2.
Input Level Control
– (Inner knob)
Adjusts the channel’s level.
Priority Select
– (Push inner knob)
Push the Input Level Control to set priority for the channel. When priority is
set, the associated priority LED illuminates in the Channel Status Display.
Push Input Level Control again to turn off priority. Refer to section on
Priority Microphones and the Lock Out Bus (Page 5) to learn more.
*Lock mode Select
– (Push inner knob for over a second)
Push the Input Level Control (CH1) and Master Volume Control [5] at the
same time to select Lock mode (Key-Lock on) or Normal operation (Key-
Lock off). Manual/Auto Mode Indicator [7] blinks when Lock mode is select.
3.
Gate Active/Overload LED indicator
LED lights green when the associated channel’s gate is open (“on”) and
red when the signal may potentially overload.
4.
P48/ATT.
Input attenuator – (Recessed button)
This recessed button is used to select between input attenuation options
and phantom power level for the associated input. Use a small tool to
press the button and cycle between selections in the following progression:
0 dB (MIC)/Phantom OFF
→
0 dB(MIC)/Phantom ON
→
-35 dB (LINE)/Phantom OFF
The Channel Status Display LEDs illuminates according to selection.
5.
Master Volume Control
– (Inner knob)
Adjusts the mixer’s overall output. Turn clockwise to increase output.
Push to select Manual or Auto Mixer mode.
6.
Threshold Level Control
– (Outer knob)
Adjusts the threshold point at which the gates open and activate a channel.
When the outer knob is set at MIN, the threshold level is down and relatively
low levels of sound activate a channel; when set at MAX, the threshold
level is high. Turn clockwise to increase threshold; counterclockwise to
decrease threshold.
7.
Manual/Auto Mode Indicator
This LED lights green when AT-MX381 is in automatic mode; it lights red
when the mixer is in manual mode; it blinks when the mixer is locked (Key-
Lock on).
8.
Output Attenuator
– (Recessed Button)
Switches the output attenuator on (-35 dB of attenuation) or off (0 dB of
attenuation). (Use a small tool to press the button and cycle between
selections.) ATT. LED illuminates in Output Status Display.
9.
Output Status Display
LED level display indicates output level of mixer.
ATT. Lights green when the output attenuator is on (-35 dB of attenuation)
LEVEL: Indicates output level. This display can be set via SmartMixer
Software to indicate output level before or after the Master Volume
Control. (Default setting is “before” master control.)
10. Channel Status Display
LEDs indicate channel settings for each input.
a. ATT. – LED lights green when the attenuator is on (LINE level input).
3
Figure 2 - AT-MX381 Rear Panel (Page 71)
14. Power Switch
15. External Control Connector
(25 pin D-Sub Female)
Provides connection points for controlling AT-MX381 from external
contact closures and control voltage output per channel. Refer to
“External Logic Connections” for more information on this connector.
16. Serial Data Connector
(PC Control)
RS232 data port. Use with PC for configuring internal mixer settings or as
input point for CRESTRON®, AMX® or other control system using open
communications protocol.
17. Link In/Link Out connectors
Provides for daisy-chaining of multiple mixers when more than eight
microphones are used. (Use included link cable to connect to another
AT-MX381.)
18. Output Connector (4-pin block screw connector)
Pin-1: Hot, Pin-2: Cold, Pin-3: Ground, Pin-4: Line Out
Provides balanced main mixer output (selectable with or without 35 dB of
attenuation) along with second unbalanced output (line level) with no
attenuation available.
19. Input Con0nector (4-pin block screw connector)
Pin-1: Hot, Pin-2: Cold, Pin-3: Ground, Pin-4: Direct Out
Input connection for each channel. Also provides DIRECT OUT for given
channel.
b. P48 – LED lights green when channel phantom power is on.
c. PRIORITY – LED lights green when channel is set for priority mode.
(Note: When input attenuator is on (Line level input), the P48 phantom
power supply is disabled.)
11. Headphone Jack
(1/4” stereo type)
Connect stereo headphones to monitor mixer’s output.
WARNING: do not connect MONO 1/4” plug, as it can damage the
mixer’s headphone amp.
12. Headphone Level Control
13. Power “on” indicator
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