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Audio-Technica AT-MX351 - page 1
A T - MX 35 1 S m a r tMi x er Automatic Mixer Installation and Operation ...
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Audio-Technica AT-MX351 - page 2
Contents Introduction ....................................................................................................................... 5 What is a SmartMixer ® ? ........................................................................................................... 5 Features ............................................................. ...
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Audio-Technica AT-MX351 - 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. Refer all servicing to qualified service personnel. W arning: This apparatus must be grounded. This product is a safety class 1 product. There must be an uninterru ...
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Audio-Technica AT-MX351 - page 4
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 ...
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Audio-Technica AT-MX351 - page 5
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 ...
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Audio-Technica AT-MX351 - page 6
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 1). XLRM-type connector ...
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Audio-Technica AT-MX351 - page 7
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 ...
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Audio-Technica AT-MX351 - page 8
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 ...
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Audio-Technica AT-MX351 - page 9
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 co ...
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Audio-Technica AT-MX351 - page 10
Figure 4. Internal view of mixer. Figure 5. Detail of internal controls. SW27 SW25 SW26 Front Panel Rear Panel 1 1 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 ...
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Audio-Technica AT-MX351 - page 11
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, ...
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Audio-Technica AT-MX351 - page 12
CV G R Driving One LED I ≈ 2v R+40 Ω Driving Lamps 2 N 3904 + CV 1 0 K Ω G G CV Driving Logic Gates Equivalent Output Circuit for Control V oltage Out CONTROL V OL T AGE 4 0 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 th ...
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Audio-Technica AT-MX351 - page 13
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 ...
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Audio-Technica AT-MX351 - page 14
Specifications † Input Impedance Mic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,000 ohms Line . . . . . . . . . . . . . . . . . . . . . . . . . . . 50,000 ohms Aux . . . . . . . . . . . . . . . . . . . . . . . . . . . 50,000 ohms Link In . . . . . . . . . . . . . . . . . . . . . . . . 20,000 ohms Output Impedance Balanced Line . . ...
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Audio-Technica AT-MX351 - page 15
One - Year Limited Warranty Audio - Technica brand products purchased in the U.S.A. are warranted for one year from date of purchase by Audi o - 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 cha rge or, at our option, replaced with a new produ ...
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