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Audio Technica SmartMixer AT-MX351 Installation And Operation Manual

Automatic mixer
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AT-MX351 SmartMixer
®
Automatic Mixer
Installation and Operation

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Summary of Contents for Audio Technica SmartMixer AT-MX351

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

  • Page 2: Table Of Contents

    Contents Introduction ...5 ® What is a SmartMixer Features ...5 Front Panel ...6 Rear Panel ...7 Installation and Setup 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 3 Safety Cautions Prior to use of this product, review all safety markings and instructions. To prevent electric shock, do not remove the cover. There are no user-serviceable parts inside. Internal adjustments are for qualified professionals only. Refer all servicing to qualified ser- vice personnel.

  • Page 4: Introduction

    SmartMixers that can be daisy-chained. Features The AT-MX351 provides an independent gain control on the front panel for each input channel. Substantial gain reserve and adjustment range permit microphones of widely differing sensi- tivities to be used together successfully. Automatic threshold setting on all mic/line channels ensures proper gating levels for existing ambient sound conditions.

  • Page 5: 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.

  • Page 6: 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).

  • Page 7: 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 8: 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 9: 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 10: Rear Panel

    Line Line Phantom 40 dB Phantom 40 dB 30 dB 30 dB Gating –20 dB Min. –6 dB Min. –40 dB –10 dB –10 dB +10 dB +10 dB Figure 5. Detail of internal controls. SW15 SW21 Line Line Phantom 40 dB SW13 SW14...

  • Page 11: 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 12: 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 13: Daisy-Chaining Mixers

    Note that one or more mixers can be switched to “Manual” mode without affecting the automatic operation of any other mixers in the chain. NOMA information is passed between AT-MX351 mixers through Link In/Out. If AT-MX351 mixers are linked with AT-MX341 and/or AT-MX341a mixers, the NOMA function will pass through the AT-MX341(a) models but their mics will not be included in the NOMA calculation.

  • Page 14: Specifications

    Specifications † Input Impedance ......Line ......

  • Page 15: 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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