AT MX381
SmartMixer® Eight-channel Automatic Mixer

AT MX381

AT MX381
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Equipped with optional computer control, the AT-MX381 SmartMixer® is the latest addition to Audio-Technica’s family of automatic mixers. This microprocessor-controlled automatic mixer is designed to provide automatic mixing functions for installed sound, house of worship, broadcast and conference applications. Engineered for intuitive, easy-to-use operation, the new SmartMixer automatically keeps the number of open microphones to a minimum, bringing background noise and feedback under control and providing increased clarity and audio quality.


  • Eight balanced inputs allow use with both mic- and line-level signals Each input provides: -Phantom power (48V), individually selectable -Individual gain and volume controls -Gate attenuation (adjustable) -Low-cut filter (individually selectable via SmartMixer Software)
  • An RS232 data port provides a connection point for a PC with included SmartMixer Software
  • Compatible with Crestron® and AMX® systems
  • External control capability enables the SmartMixer to activate other devices Force-On – allows an external contact closure to force its associated input to turn on Force-Off – allows an external contact closure to force its associated input to turn off Control Voltage Out – a voltage appears when the associated input’s gate opens or turns “on”
  • Selectable NOMA (Number of Open Mics Attenuated) circuitry helps control feedback
  • Priority pre-select feature allows priority of each microphone to be independently assigned
  • Last Mic On selectable for continuous room ambiance
  • Linking capability for 16 units (up to 128 channels)
  • A direct output connection is available for each input
  • Equipped with two audio outputs (one balanced, one unbalanced) to drive amplification systems or other equipment
  • Monitor headphone output with level control
  • Basic functions are configured via front panel; detailed settings through SmartMixer Software
  • Mounts in a single 19" rack space via integral rack mount
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Input Impedance Mic Level: 6600 ohms Line Level: 8500 ohms
Output Impedance Balanced Line Level: 300 ohms Mic Level: 350 ohms Unbalanced: 400 ohms Direct Output: 60 ohms
Maximum Input Level -50 dBu (gain at Max)
Maximum Output Level 22 dBm (THD+N at 1%)
Maximum Monitor Output 50mW (@ 1% THD+N) with 16 ohm load
Maximum Gain 69 dB
Frequency Response 20 to 20K Hz (±3 dB)
Equivalent Input Noise -130 dBu*
Microphone Phantom Power +48V DC
Control Voltage Out +4V DC
Power Supply 100/240V AC (auto-select), 50/60 Hz, 20W
Operating Temperature 32° to 104° F (0° to 40° C)
Dimensions 16.93” (430 mm) W x 9.05” (230 mm) D x 1.75” (44 mm) H (not including feet, knobs and connectors)
Weight 8 lbs. 6 oz (3.8 kg)




AT-MX381 Submittal Sheet
AT-MX381 SmartMixer Manual
AT-MX381 SmartMixer Software Manual