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Audio-Technica AT-MX351 Installation and Setup, Priority Microphones and the Lockout Bus Channels

Models: AT-MX351

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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.

4.Connect the power cord to the mixer and plug into AC outlet. Be certain the voltage switch on bottom of unit is set for the voltage of the outlet you are using.

5.Turn Power switch “on.” The mixer will perform a self-test and turn each microphone “on” and “off ” consecutively.

6.Connect a microphone to Input 1 and turn the Gain 1 control to the “nine o’clock” position. The channel 1 LED will light if the microphone is operational.

7.Adjust the Gain 1 control for proper meter indication when speaking into microphone (peaks at 0).

8.Plug in up to three other microphones and adjust each respective Gain control for proper meter indication.

9.Priority can be assigned to one or more microphones by moving the appropriate DIP switch(es) to the “up” position. Any microphone(s) assigned in this manner cannot be locked out by any other microphone.

10.“Manual” mode can be selected at any time by moving the right-hand DIP switch to the “up” position. In this mode, the unit will behave like a conventional mixer (all automatic functions are bypassed except for limiting and NOMA if selected).

11.Adjust the Master level control for desired output level. This control is at the last stage in the mixer, and does not affect microphone gain, threshold setting, meter indication, monitor or preamp outputs.

Priority Microphones and the Lockout Bus (Channels 1-4)

Once the Gain controls have been properly adjusted, an audio signal appearing in any channel causes the lockout control bus to activate and the Lockout LED indicator to light. The Priority Pre-select switches then determine whether or not a particular mic is affected by lockouts caused by other mics: a channel Priority switch in the “down” position will allow lockout* of its mic; the same switch “up” will not allow lockout of its mic.

*Note that any mic which is described as “locked out” or “off ” is really just being attenuated by between 6 dB and 40 dB from the level otherwise determined by its Gain control setting, sensitivity and placement. See the “Daisy-chaining Mixers” section on page 14 for further details.

There are basically three “modes” of priority pre-select automatic operation:

Mode 1... Priority Pre-select switches (1-4) Up

The Lockout indicator will come on with any audio input, but no mic will be locked out…because none are connected to the lockout bus. (This mode is often called “Free-for-all”…or sometimes “City Council”!)

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Audio-Technica AT-MX351 manual Installation and Setup, Priority Microphones and the Lockout Bus Channels
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AT-MX351 specifications

The Audio-Technica AT-MX351 is a versatile mixer that has gained a strong reputation amongst audio professionals for its performance and utility. Designed for various applications, from live sound to permanent installation, the AT-MX351 boasts features that enhance audio quality and ease of use.

One of the standout features of the AT-MX351 is its ability to handle multiple audio sources with ease. It features three programmable microphone inputs, making it perfect for settings where multiple speakers or performers are involved. This is especially useful in conference rooms, lecture halls, and places of worship, where different users may need to take turns speaking without the hassle of connecting and disconnecting microphones.

The mixer is equipped with advanced automatic mixing technology, which intelligently manages the audio levels from various microphones. This prevents feedback and minimizes background noise, resulting in clear and intelligible sound. The AT-MX351 utilizes Audio-Technica's proprietary Automatic Gain Controls (AGC) to ensure that the audio levels remain consistent, providing a professional sound experience.

In terms of connectivity, the AT-MX351 features balanced XLR inputs, allowing for secure connections that maintain audio integrity. It also includes unbalanced line inputs, catering to a wider array of equipment. The mixer offers both balanced and unbalanced outputs, providing flexibility for integration into different sound systems.

Another notable characteristic of the AT-MX351 is its user-friendly interface. The layout of the controls is intuitive, allowing operators to make quick adjustments on the fly. The clear LED indicators help users monitor signal levels easily, making it easier to identify any issues. This is particularly beneficial during live events where quick decision-making is crucial.

The AT-MX351 also incorporates a built-in limiter and compressor, which help to avoid distortion and maintain a consistent sound quality. This feature is especially important in environments with varying acoustic dynamics or when dealing with powerful audio signals.

In summary, the Audio-Technica AT-MX351 mixer stands out due to its robust features, including multiple programmable microphone inputs, advanced automatic mixing technology, and user-friendly controls. This combination of technology and usability makes it an ideal choice for audio professionals seeking reliability and high-quality sound in their applications. Whether for live performances, conferences, or installations, the AT-MX351 proves to be a reliable and effective solution in the audio mixing landscape.