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Audio-Technica AT-MX351 manual

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Table of contents for the manual

  • Page 1

    A T - MX 35 1 S m a r tMi x er  Automatic Mixer Installation and Operation[...]

  • Page 2

    [...]

  • Page 3

    Contents Introduction ....................................................................................................................... 5 What is a SmartMixer  ? ........................................................................................................... 5 Features ............................................................[...]

  • Page 4

    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. Pour prévenir un choc électrique, ne pas ouvrir [...]

  • Page 5

    Introduction Please Note! This manual assumes use of microphone-level inputs and line-level output, the most typical 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 1 0 for details. What is a SmartMixer? The AT-MX351 SmartMixe[...]

  • Page 6

    A T -MX35 1 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. Outpu[...]

  • Page 7

    A T -MX35 1 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 1 0). XLRM-type connector[...]

  • Page 8

    Installation and Setup AT-MX35 1 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. 4. Connect the power cord to the mixer and plug into AC outlet. Be[...]

  • Page 9

    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. This switching takes place without any syllable-grabbing del[...]

  • Page 10

    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 res pectiv ely. Note that the appropriate internal switches can be used in[...]

  • Page 11

    Figure 4. Internal view of mixer. Figure 5. Detail of internal controls. SW27 SW25 SW26 Front Panel Rear Panel 11 Mic Line SW3 –40 dB SW5 –20 dB VR3 Min. –6 dB –40 dB SW1 1 –20 dB VR6 Min. –6 dB –40 dB SW1 7 –20 dB VR9 Min. –6 dB –40 dB SW23 –20 dB VR1 2 Min. –6 dB – 1 0 dB +10 dB VR2 – 1 0 dB +10 dB VR2 – 1 0 dB +10 d[...]

  • Page 12

    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,[...]

  • Page 13

    CV G R Driving One LED I ≈ 2v R+40 Ω Driving Lamps 2 N 3904 + CV 10 K Ω G G CV Driving Logic Gates Equivalent Output Circuit for Control V oltage Out CONTROL V OL T AGE 40 Ω GND Relay Driver 2N3904 IN4001 + CV 10K Ω RELA Y COIL G Control V oltage Out When a microphone channel turns “on ,” as indicated by a Selected Channel LED on the [...]

  • Page 14

    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; Mixer #2 output then contai[...]

  • Page 15

    Specifications † Input Impedance Mic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,000 ohms Line . . . . . . . . . . . . . . . . . . . . . . . . . . . 50,000 ohms Aux . . . . . . . . . . . . . . . . . . . . . . . . . . . 50,000 ohms Link In . . . . . . . . . . . . . . . . . . . . . . . . 20,000 ohms Output Impedance Balanced Line . . [...]

  • Page 16

    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[...]