AT-MX351a

SmartMixerŽ Five-channel Automatic Mixer

MSRP* US$829.00
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
  • Reviews
  • Q & A

  • Overview

    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.
  • 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

    Master Level control at maximum (fully clockwise)
    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 (open circuit)
    Preamp Out: -10 dBV (open circuit)

    Master Level control at maximum (fully clockwise)
    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 terminated with 150 ohms, A-weighted using Audio Precision System One.
    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 100V-240V AC, 50-60 Hz, 30W
    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 7 lbs. 6 oz (3.35 kg)
    Accessories Included AC power cable; AT8325/1.0 Link Cable; rack mount adapters; security caps



    Conditions
  • Downloads

    AT-MX351a Manual (pdf 1.07 M)
  • Reviews

  • Q & A

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    1 Question | 1 Answer
    Displaying question 1
    • Q:

      If connecting the AT-MX351a to a high impedance destination, is it necessary to put a resistor on the output (200 ohms, 300 ohms, or 400 ohms, dependi

      If connecting the AT-MX351a to a high impedance destination, is it necessary to put a resistor on the output (200 ohms, 300 ohms, or 400 ohms, depending on the type of output used), in order to make the meter display a proper level, or is this not required? If required, across which pins of the XLR should the resistor go?
      Asked on 4/21/2014 by AllanTepper from Miami, FL, USA

      1 answer

      • A:

        Typically speaking, audio input impedance should be at least 10x greater than the incoming output impedance. Therefore, if the output impedance of a device is 400 ohms, the input impedance should be at least 4,000 ohms. As an example, if you would like to connect a microphone to the MX351a (microphone input impedance is 8,000 Ohms), then the microphone should typically be 800 ohms or less.

        Since most audio input impedance ratings are 8,000 ohms and up, and the output impedance of the MX351a varies between 100 Ohms and 750 ohms (depending on the output used), I couldn't see a scenario where you would need to add resistors to any MX351a output. That would, however, mostly depend on the input impedance of your input device.

        Given the above information, if you would like to correspond further, please contact the Audio-Technica United States (ATUS) Audio Solutions Department at audio-solutions@atus.com

        Thanks!

        Answered on 4/23/2014 by AudioSolutionsSpec2 from Stow, OH
    Displaying question 1

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