Audio Technica AT-MX351 SmartMixer Installation And Operating Manual
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Audio Technica AT-MX351 SmartMixer Installation And Operating Manual

Audio Technica AT-MX351 SmartMixer Installation And Operating Manual

Automatic mixer
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AT-MX351 SmartMixer
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Automatic Mixer
Installation and Operation

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Summary of Contents for Audio Technica AT-MX351 SmartMixer

  • Page 1 AT-MX351 SmartMixer ® Automatic Mixer Installation and Operation...

  • Page 3: Table Of Contents

    Contents Introduction ........................5 ® What is a SmartMixer ? ......................5 Features .............................5 Front Panel ..........................6 Rear Panel ..........................7 Installation and Setup ....................8 Priority Microphones and Lockout Bus .................8 NOMA ............................9 Auxiliary Input ..........................9 Preamplifier Gain ........................9 Output Level ...........................10 Phantom Power ........................10 Output Level LED Meter ......................10 Adjusting “Off”...
  • Page 4 Safety Cautions Prior to use of this product, review all safety markings and instructions. CAUTION AVIS RISK OF ELECTRIC SHOCK RISQUE DE CHOC ÉLECTRIQUE DO NOT OPEN NE PAS OUVRIR To prevent electric shock, do not remove the cover. There are no user-serviceable parts inside. Internal adjustments are for qualified professionals only.

  • Page 5: Introduction

    SmartMixer application. However, all inputs and the output may be individually switched internally to achieve any combination of mic- and line-level input/output. See page 10 for details. What is a SmartMixer? The AT-MX351 SmartMixer ® is a microprocessor controlled, automatic switching, five-channel mixer.

  • Page 6: Front Panel

    AT-MX351 Front Panel 1. Power switch. 2. Power “on” indicator. 3. Input Gain controls. Adjust inputs for microphone sensitivities and/or operating conditions. 4. Selected Channel LED indicators. Indicate which channels are “on” or “active.” 5. Aux In control. Adjusts input for source output level and/or operating conditions. 6.

  • Page 7: Rear Panel

    AT-MX351 Rear Panel 1. External Control connector. For TTL output, plus closure-control input for external control of each channel. 2. Link In/Link Out. Provides for daisy-chaining of multiple mixers when more than four microphones are used. 3. Line/Mic balanced output. Level can be changed via internal switch (see page 10). XLRM-type connector.

  • Page 8: Installation And Setup

    Installation and Setup AT-MX351 SmartMixer setup tips: 1. Turn the Master level control to the minimum position. Proceed with steps 2-9. 2. Set all Priority DIP switches and Manual mode switch to “down” position. 3. Turn all four microphone Gain controls fully counterclockwise.

  • Page 9: Noma

    Mode 2…Priority Pre-select switches (1-4) Down In this mode, only one mic at a time can be “on.” The lockout bus shuts down all other mics until the first speaker pauses. As soon as the controlling microphone goes silent, the lockout bus goes inactive and any other mic can come on.

  • Page 10: Output Level

    The preamplifier gain may be reduced further, allowing the SmartMixer to accept line-level sources. Changing the settings of the internal switches designated by “SW3,” “SW9,” “SW15” and “SW21” will cause an input reduction of 50 dB for channels 1, 2, 3 and 4 respectively. Note that the appropriate internal switches can be used in combination for a total sensitivity reduction of up to 60 dB for each channel.

  • Page 11: Rear Panel

    Rear Panel SW26 SW25 SW27 Front Panel Figure 4. Internal view of mixer. SW1 5 SW2 1 Line Line Line Line Line P h a n t o m 40 dB P h a n t o m 40 dB P h a n t o m 40 dB P h a n t o m...

  • Page 12: Adjusting "Off" Attenuation

    Adjusting ”Off” Attenuation In instances when the number of microphones in use is high, it may be necessary to increase the amount of “off ” attenuation per microphone to keep the total ambient noise level low. There are “off ” attenuation adjustments inside the unit. To adjust the “off ” attenuation of channel 1, unplug the unit, remove the top cover and locate the trimpot designated on the circuit board by “VR3”...

  • Page 13: Control Voltage Out

    Control Voltage Out When a microphone channel turns “on,” as indicated by a Selected Channel LED on the front panel, the channel’s associated Control Voltage Out goes “high” (+4 VDC). See chart on page 12 for pin connection. This signal can be used to light indicator lamps, switch speaker zones on and off, select video cameras, etc.

  • Page 14: Daisy-Chaining Mixers

    Daisy-chaining Mixers When more than four microphones are needed, it is possible to daisy-chain multiple SmartMixers together through the Link In/Out connectors on their back panels (Fig. 2). Connect Mixer #1 Link Out jack to Mixer #2 Link In jack, etc. Mixer #1 output contains only audio from the first four microphones;...

  • Page 15: Specifications

    Specifications † Input Impedance 8,000 ohms ......Line 50,000 ohms ......50,000 ohms .

  • Page 16: Warranty

    One-Year Limited Warranty Audio-Technica brand products purchased in the U.S.A. are warranted for one year from date of purchase by Audio-Technica U.S., Inc. (A.T.U.S.) to be free of defects in materials and workmanship. In event of such defect, product will be repaired promptly without charge or, at our option, replaced with a new product of equal or superior value if delivered to A.T.U.S.

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