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SmartMixerŽ Five-channel Automatic Mixer

U.S. Two-Year Limited End-User Warranty

*Manufacturer's Suggested Retail Price. Actual selling price may vary; please check with an authorized Audio-Technica dealer.

  • Overview
  • Features
  • Specifications
  • Downloads

  • Overview

    The AT-MX351 has been discontinued. The AT-MX351a is a similar model, click here for more information.

    The AT-MX351 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.
  • 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

  • Specifications

    Input Impedance Mic: 8,000 ohms
    Line: 50,000 ohms
    Aux: 50,000 ohms
    Link In: 20,000 ohms
    Output Impedance Balanced
    Line: 200 ohms
    Mic: 300 ohms
    Unbalanced: 400 ohms
    Link Out: 100 ohms
    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)
    Line: +4 dBm (600 ohms), +4.4 dBV (open circuit)
    Mic: -46 dBm (600 ohms), -44 dBV (open circuit)
    Unbalanced: -10 dBV (open circuit)
    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

  • Downloads

    AT-MX351 Manual (pdf 231.15 KB)
    AT-MX351 Submittal Sheet (pdf 252.55 KB)