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Audio-Technica ATMX351A
5Ch Automatic Mixer


The AT-MX351a automatic mixer is ideal for meetings, seminars, teleconferencing, worship services, courtroom proceedings, radio and TV broadcasting and A/V applications.
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Audio-Technica ATMX351A
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The AT-MX351a automatic mixer is ideal for meetings, seminars, teleconferencing, worship services, courtroom proceedings, radio and TV broadcasting and A/V applications. All switching is under microprocessor control with proprietary algorithms for instant, seamless operation. An individual priority pre-select switch for each mic/line channel allows choice of one-channel-at-a-time operation, all active, or any mix of moderator override. The last microphone on stays on so that ambient sound is never muted. Plus, any number of SmartMixers can be linked to create a system for large multi-mic installations. The priority control system extends throughout the entire chain.

Audio-Technica ATMX351A Features:

  • Four automatic Mic/Line inputs, plus Aux in
  • Automatic threshold setting
  • 48V phantom power individually selectable for each channel
  • Limiters on each mic channel prevent individual channel overload
  • Balanced inputs and output, selectable Mic/Line-level
  • Individual gain controls for each channel
  • Switchable manual mode overrides automatic functions
  • Master output level control
  • Pre- or post-controller audio outputs from Mic/Line channels
  • Off attenuation for each input adjustable to -40 dB
  • Sub-D connector for TTL output, plus closure-control input for external control of each channel
  • NOMA operation provided, can be turned on/off
  • Output level meter with Peak and RMS modes
  • Monitor headphone output with adjustable level
  • Internal AC supply
  • Mounts in a single 19" rack space
  • Includes rack mount adapters

Audio-Technica ATMX351A Specifications:

  • Input Impedance:
      -  Mic: 8,000 ohms
      - Line: 50,000 ohms
      -  Aux: 50,000 ohms
      -  LinkIn: 20,000 ohms
  • Output Impedance:
     -  Balanced
          *  Line: 200ohms
          *  Mic: 300 ohms
      - Unbalanced: 400 ohms
          *  Link Out: 100ohms
          *  Preamp Out: 750 ohms
  • Maximum Input Level:
      -  Mic: -24 dBV
      - Line: +27 dBV
      -  Aux: +17 dBV
  • Maximum Output Level:  +22 dBm
  • Nominal Output Level  (0 VU):
      - Balanced
          *  Line: +4 dBm (600 ohms),+4.4 dBV (open circuit)
          *  Mic: -46 dBm(600 ohms), -44 dBV (open circuit)
      -  Unbalanced: -10 dBV (opencircuit)
      -  Preamp Out: -10 dBV (open circuit)
  • Maximum Monitor Output:  700 mW, 20 ohm load
  • Maximum Gain:  73 dB
  • Frequency Response:  40 Hz to 22 kHz
  • Equivalent Input Noise:  -128 dBV (150 ohms) at maximum gain
  • Input Attenuation:  10 dB
  • Mic/Line Input Pads:  50 dB
  • Maximum NOMA Attenuation:  approximately 20 dB (up to 100 microphones on simultaneously)
  • Microphone Phantom Power:  +48V DC
  • Control Voltage Out:  +4V DC
  • Power Supply:  120V/230V AC (switchable), 50/60 Hz, 10W
  • Operating Temperature:  32° to 104° F (0° to 40° C)
  • Dimensions:
      -  16.93" (430 mm) W x
      - 9.38" (238 mm) D x
      -  1.75" (44 mm) H (including feet, knobs and connectors)
  • Weight:  6 lbs. 13 oz (3.1 kg)
  • Accessories Included:
      -  AC power cable
     -  AT8325/1.0 Link Cable
      -  Rack mount adapters
      -  Security caps

General Questions


Can I return a service part once it has been installed?


Installed service parts are non returnable, unless they are defective. All defective returns are exchange only - no money will be refunded.

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