SmartMixer
®
Four-Channel Automatic Mixer
AT-MX341a
Features
• Four Mic/Line inputs with individual priority pre-select switch
for each channel
• Balanced inputs and output are individually switchable between
mic and line-level
• 12V phantom power individually selectable for each channel
• Individual gain controls for each channel
• Single threshold setting for all channels
• Priority pre-select feature allows priority of each microphone to be
independently assigned
• Last Mic On keeps the most recently used microphone on for
continuous room ambiance
• Switchable manual mode overrides automatic functions
• Master output level control
• Output level meter with Peak and RMS modes
• Link-compatible with AT-MX351 SmartMixers for expanded capacity
• TTL logic output signals available to control speaker or camera
switching, tally lights, etc.
• Off attenuation for each input adjustable to -20 dB
• Mounts in a 19" rack space with included rack-mount adapter
Description
Audio-Technica’s AT-MX341a SmartMixer
®
is a microprocessor-controlled,
automatic-switching four-channel audio mixer designed to manage
multiple-microphone sound systems in meetings, seminars, teleconfer-
ences, worship services, radio and TV broadcasts and A/V applications.
It helps improve audio quality by keeping the number of open micro-
phones to a minimum, thus reducing background noise, feedback and
other distractions, while providing instant, completely transparent
switching between channels. For use with low-impedance dynamic and
condenser microphones (including wireless microphone systems), as
well as with line-level sources, the AT-MX341a automatically gates
microphones on and off for the best possible audio quality.
Each of the AT-MX341a SmartMixer’s four balanced inputs provides
switchable 12-volt phantom power and selectable –10 dB attenuation.
Balanced inputs and output are individually switchable between mic-
and line-level. To custom-tailor conferencing needs, the mode of each
microphone channel can be independently switched. The combination
of switch settings results in three different modes of priority selection/
operation. A “last mic on” feature keeps the most recently used
microphone on for continuous room ambiance. For large multi-mic
installations, as many AT-MX341a and AT-MX351 SmartMixers as needed
can be daisy-chained via the Link Cable included with each unit.
If automatic functions are not desired, the AT-MX341a SmartMixer
®
can
function in manual mode, bypassing the mixer’s automatic switching and
attenuation functions, causing the unit to behave like a conventional
mixer. TTL logic output signals are available to control speaker zones,
camera switching, tally lights, etc.
Architect’s and Engineer’s Specifications
The automatic audio mixer shall be a microprocessor-controlled, auto-
matic-switching four-channel audio mixer. It shall be suitable for use with
low-impedance dynamic and condenser microphones (including wireless
microphone systems), as well as with line-level input sources. The auto-
matic mixer shall be equipped with four balanced inputs, each providing
switchable 12-volt phantom power. Independent front panel input level
controls shall be provided for each input. Internal Mic/Line switches and
10 dB pad switches on each channel shall allow the automatic mixer to
accept a wide variety of microphone and line-level signals. Each input
shall be provided with an input gate indicator to show channel gate
status. Input and output connections shall be via standard XLR-type
connectors.
The mixer shall be designed to operate in one of three priority configura-
tions, allowing certain inputs to have priority over other inputs. It shall be
possible to independently configure the setting of each input channel, for
one of the priority modes. Any combination of priority/ non priority selec-
tions shall be allowed for maximum operational flexibility. An adjustable
master threshold control shall be provided to allow for setting the point
at which the gates are triggered. Front panel status indicators shall be
provided showing attenuation status. The mixer shall allow the last active
microphone to stay active (on) so that ambient sound is never muted. The
automatic mixer shall offer a manual mode, which bypasses the mixer’s
automatic switching and attenuation functions. The automatic mixer shall
provide external logic control outputs to enable the mixer to interface
with external devices for control and status indication. A control voltage
output shall be provided for each channel. The control output shall provide
+4V DC whenever its associated channel becomes active allowing the
SmartMixer
®
to control other devices and/or tally lights.
One balanced audio output shall be provided to drive amplification
systems or other equipment. An internal MIC/Line switch shall enable
the SmartMixer
®
to feed mic- or line-level inputs. A master output control
shall be provided to set the overall level of the automatic mixer. A built-in
linking function shall allow multiple automatic mixers to be daisy-chained
for large multi-mic installations. When operating in this way, the output
for all of the linked mixers appears at the master mixer in the chain. Last
mic on and other configuration settings shall cascade through the entire
chain of linked mixers. Each mixer shall include the cable for linking units
together.
The automatic mixer shall be a half-rack unit designed to mount with
included rack-mount adapters in a standard 19" equipment rack.
12V AC through an external power supply shall power the automatic
mixer.
The Audio-Technica AT-MX341a is specified.
SmartMixer
®
