User manual
Audio-Technica AT-MX351a 5-Channel Automatic Mixer

User Manual for Audio-Technica AT-MX351a 5-Channel Automatic Mixer

• Product category: Install Sound Mixers Audio-Technica
• Brand: Audio-Technica
• Description and content of package
• Technical information and basic settings
• Frequently asked questions – FAQ
• Troubleshooting (does not switch on, does not respond, error message, what do I do if...)
• Authorized service for Audio-Technica Install Sound Mixers

Product description

Priority Pre-Select
• The front panel of the mixer features "Priority Pre-Select" switches which determine which microphones will take priority and attenuate or lower the volume of other microphones in the system. When a channel's switch is down, that channel can be "locked out" or attenuated between 6 and 40 dB by the other microphones in the system. When the switch is up, the microphone cannot be attenuated.
  
  In the first "Free-for-all" or "City-Council" mode wherein all the switches are "UP," the other microphones will remain on when the priority microphone(s) are active. This is useful for applications when any speaker is allowed to speak at any time.
  
  In the second "First-come-first-serve or "filibuster" mode wherein the microphone switches are "Down," the non-priority microphones will be attenuated by an adjustable value of 6 to 40 dB when the priority microphone is active. After the priority microphone stops, any microphone may come on but only one microphone may be active at a time. This mode is useful for applications when it is beneficial to have one person talking at a time.
  
  In the third "Chairperson Mode," wherein one priority pre-select switch is up, the priority microphone(s) can come on at any time and attenuate the other microphones. This mode is useful for applications when one speaker must be able to interrupt and speak over the other speakers

NOMA (Number of Open Microphones)
• When enabled, the NOMA (Number of Open Microphones Attenuated) switch maintains the overall system gain by reducing the amplifier gain of each additional microphone added to the system. This is useful for suppressing feedback and maintaining a consistent overall output signal

Daisy-Chaining
• For applications that require more than four microphones, multiple mixers may be daisy-chained together by the included AT8325/1.0 Link cable. When connected, the link out of the first mixer is connected to the link in of the second mixer, so that the audio output of the second mixer will be both that of the first and the second. The audio output for the application is taken from the last mixer in the chain. When multiple mixers are daisy-chained together the priority-select settings of each mixer are sent through the chain such that any microphone in the chain can determine the attenuation or "lock-out" of the other microphones in the chain

Auxiliary Input
• The mixer includes an Auxiliary RCA input jack that accepts -10 dBV input from an external audio device such as a CD player. The auxiliary input does not have any signal processing

Phantom Power
• Each microphone input can supply +48 VDC phantom power. Phantom power may be disabled by removing the amplifier's top cover and throwing the switches "S102," "S202," "S302," and "S402" for input channels 1, 2, 3, and 4 respectively. Though phantom power is not required for their operation, most balanced dynamic microphones will work without having to disable phantom power

Output Level
• The mixer can output either a line level signal or switched to a microphone level signal by unplugging the power, removing the top cover, and throwing the switch on the circuit board labeled "S602." Switching to a microphone level signal reduces the output by 50 dB

Output Level LED Meter
• The output level LED meter can display either RMS or be switched to peak output by unplugging the power, removing the top cover, and throwing the switch on the circuit board labeled "S603"

"Off" Attenuation
• Internal trim pots allow you to adjust the level of microphone attenuation between 6 dB and 20 dB

Preamp Outputs
• Separate from the main mixer output, each channel has its own unbalanced preamp output for connecting to a recorder. Each of these outputs may be gated by unplugging the power, removing the top cover, and throwing the switches labeled "S104," "S204," "S304," and "S404" for pre-amps 1, 2, 3, and 4 respectively

Input Limiters
• Each microphone input channel has an adjustable limiter between -10 dB RMS and +10 dB RMS that may be adjusted by unplugging the power, removing the top cover, and turning the trimpots labeled "VOL103", "VOL203", "VOL303", and "VOL403" for inputs 1, 2, 3, and 4. To turn off the limiters completely, unplug the power, remove the top cover, and flip the switches on the circuit board labeled "S106," "S206," "S306," "S406"

Force-On/Force-Off
• By connecting a closure pin and ground reference to the appropriate external control connector on the back panel of the mixer, it is possible to force a channel to be either on or off

Control Voltage Out
• When a microphone input turns on, it is possible to use the channel's +4 VDC control voltage out to light indicator lamps, select video cameras, and switch speaker zones

Rack Mounting
• Included with the mixer are two rack ears and self-tapping screws to mount the mixer in a 1 unit 19" rack space

Security Caps
• For installations wherein you don't want input settings changed after they have been calibrated, the mixer comes with seven security caps that attach to and lock the front panel control knobs

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