Audio Technica AT-MX351a SmartMixer Installation And Operation Manual
AT-MX351a SmartMixer
Automatic Mixer
®
AUTOMATIC MIXER AT-MX351a
Power
Gain 1 Gain 2 Gain 3 Gain 4 Aux In Master
Selected Channel
Installation and Operation
Output Level
-6
-20 -10
Priority Pre-select
1 2 3 4 MANUAL
-30+3 +6
Monitor
Lockout
Contents
Introduction .......................................................................................................................5
What is a SmartMixer®? ...........................................................................................................5
Features .....................................................................................................................................5
Front Panel ................................................................................................................................6
Rear Panel .................................................................................................................................7
Installation and Setup ................................................................................................8
Priority Microphones and Lockout Bus .................................................................................8
NOMA ........................................................................................................................................9
Auxiliary Input ..........................................................................................................................9
Preamplier Gain ..................................................................................................................... 9
Output Level ...........................................................................................................................10
Phantom Power ......................................................................................................................10
Output Level LED Meter ........................................................................................................10
Adjusting “Off” Attenuation .................................................................................................12
Preamp Outputs .....................................................................................................................12
Input Limiters ..........................................................................................................................12
Force-on/Force-off ..................................................................................................................12
Control Voltage Out ...............................................................................................................13
Daisy-chaining Mixers ...........................................................................................................14
Rack Mounting ........................................................................................................................14
Security Caps ..........................................................................................................................14
Specications .................................................................................................................15
Installation and Operation
Warning
To prevent fire or shock hazard, do not expose the unit to rain or moisture.
To avoid electrical shock, do not open the cabinet. Refer servicing to qualified
personnel only.
Caution
Safety Cautions
Prior to use of this product, review all safety markings and instructions.
Warning: This apparatus must be grounded.
This product is a safety class 1 product. There must be an uninterruptible safety earth ground from the main power source to the product’s AC input.
Whenever it is likely that the protection has been impaired, disconnect the
power cord until the ground has been restored. An apparatus with class 1 construction shall be connected to an AC outlet with a protective grounding connection.
This apparatus is not disconnected from the mains as long as it is connected to
the AC outlet, even if the unit itself has been turned off.
In case of emergency, disconnect the power cord plug of this apparatus quickly.
Installation place
Do not install this apparatus in a confined space such as a bookcase or similar
unit. Please install this model in the place where ventilation is good. The apparatus should be located close enough to the AC outlet so that you can easily
grasp the power cord plug at anytime. In case of emergency, disconnect the
power cord plug of the apparatus quickly.
Caution for FCC
You are cautioned that any changes or modifications not expressly approved in
this manual could void your authority to operate this equipment.
Warning for FCC
This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may
cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment
does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following measures:
—
Reorient or relocate the receiving antenna.
—
Increase the separation between the equipment and receiver.
—
Connect the equipment into an outlet on a circuit different from that to
which the receiver is connected.
—
Consult the dealer or an experienced radio/TV technician for help.
IC statement
This Class B digital apparatus complies with Canadian ICES-003. Cet appareil
numérique de la classe B est conforme á la norme NMB-003 du Canada.
Important Safety Instructions
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8) Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.
9) Do not defeat the safety purpose of the polarized or grounding-type plug.
A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade
or the third prong are provided for your safety. If the provided plug does
not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
10)
Protect the power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
11) Only use attachments/accessories specified by the manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is
used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
13) Unplug this apparatus during lightning storms or when
unused for long periods of time.
14) Refer all servicing to qualified service personnel.
Servicing is required when the apparatus has been damaged in any way,
such as power-supply cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped.
Notice
The apparatus shall not be exposed to dripping or splashing. No object filled
with liquids, such as vases, shall be placed on the apparatus.
Use with Rack Mounting
If you install the unit into a rack, select a rack having an all-pole mains switch
(with a contact separation of at least 3mm in each pole) in its front.
In case of emergency, turn off the mains switch on the rack, or disconnect the
plug of the rack quickly.
4
Introduction
Please Note!
Please Note!
This manual assumes use of microphone-level inputs and line-level output, the most typical SmartMixer
This manual assumes use of microphone-level inputs and line-level output, the most typical
application. However, all inputs and the output may be individually switched internally to achieve any
SmartMixer application. However, all inputs and the output may be individually switched
combination of mic- and line-level input/output. See page 10 for details.
internally to achieve any combination of mic- and line-level input/output. See page 10 for details.
About internal adjustment
Operating personnel must not remove equipment covers. Only qualified, experienced, authorized service
personnel may remove equipment covers for any internal adjustments.
The AT-MX351a SmartMixer® is a microprocessor controlled, automatic switching, five-chan-
Important caution for service personnel making internal adjustments
nel mixer.
High voltages are present when the unit’s power cord is plugged into an electrical outlet. Service personnel
The four microphone inputs are XLRF-type balanced, with 48-volt phantom power available on
should not make any internal adjustments with power cable connected. Disconnect the power cord from its
pins 2 and 3. The Aux input is an RCA jack accepting auxiliary-level input from external audio
source before removing equipment cover, because of the danger of touching an internal high voltage part.
devices. There is no signal processing of the Aux input. The mixer output is XLRM-type
Also, to avoid injury, take care not to touch any sharp edges within the unit, its top panel or interior sections.
balanced, non-inverting.
All AT-MX351a and AT-MX341 SmartMixers can be daisy-chained via the included
What is a SmartMixer®?
AT8325/1.0 Link Cable and special connectors on the rear panel. The control bus and the
The AT-MX351a SmartMixer® is a microprocessor controlled, automatic switching, five-channel mixer.
audio are carried between mixers by the link cable. The result is that all microphones on a
The four microphone inputs are XLRF-type balanced, with 48-volt phantom power available on pins 2
multi-mixer system can be controlled by one microphone connected to any mixer. Since all
and 3. The Aux input is an RCA jack accepting auxiliary-level input from external audio devices. There is
of the mixers are independently powered, there is no practical limit to the number of
no signal processing of the Aux input. The mixer output is XLRM-type balanced, non-inverting.
SmartMixers that can be daisy-chained.
All AT-MX351-model SmartMixers and AT-MX341-model SmartMixers can be daisy-chained via the
included AT8325/1.0 Link Cable and special connectors on the rear panel. The control bus and the audio
are carried between mixers by the link cable. The result is that all microphones on a multi-mixer system
can be controlled by one microphone connected to any mixer. Since all of the mixers are independently
powered, there is no practical limit to the number of SmartMixers that can be daisy-chained.
The AT-MX351a provides an independent gain control on the front panel for each input chan-
nel. Substantial gain reserve and adjustment range permit microphones of widely differing
sensitivities to be used together successfully. Automatic threshold setting on all mic/line chan-
Features
nels ensures proper gating levels for existing ambient sound conditions.
The AT-MX351a provides an independent gain control on the front panel for each input channel.
Priority Pre-select
Substantial gain reserve and adjustment range permit microphones of widely differing sensitivities to be
used together successfully. Automatic threshold setting on all mic/line channels ensures proper gating
To custom-tailor conferencing needs, the mode of each microphone channel can be indepen-
levels for existing ambient sound conditions.
dently switched via the front panel “Priority Pre-select” DIP switches. The combination of
Priority Pre-select
switch settings results in three different modes of priority selection/operation.
To custom-tailor conferencing needs, the mode of each microphone channel can be independently
In any of the three modes of operation, when everyone stops talking, the last microphone “on”
switched via the front panel “Priority Pre-select” DIP switches. The combination of switch settings
will remain “on.” In a teleconferencing, recording, or broadcast application, this feature will
results in three different modes of priority selection/operation.
provide continuous room ambience. This feature is cascaded throughout all linked mixers so
In any of the three modes of operation, when everyone stops talking, the last microphone “on” will remain
that only one microphone in the entire system will remain on.
“on.” In a teleconferencing, recording, or broadcast application, this feature will provide continuous room
When a microphone is “off,” its input is only attenuated. This attenuation is factory set at
ambience. This feature is cascaded throughout all linked mixers so that only one microphone in the entire
8 dB. The amount of “off ” attenuation can be internally adjusted between 6 dB and 40 dB if
system will remain on.
desired. (See page 12, “Adjusting ‘Off ’ Attenuation.”)
When a microphone is “off,” its input is only attenuated. This attenuation is factory set at 8 dB. The
amount of “off ” attenuation can be internally adjusted between 6 dB and 40 dB if desired. (See page 12,
If automatic switching is not desired, a “manual” DIP-switch setting on the front panel bypasses
“Adjusting ‘Off ’ Attenuation.”)
the AT-MX351a’s automatic switching and attenuation functions, causing the unit to behave
like a conventional mixer. In this mode, the relative level of each microphone is strictly a
If automatic switching is not desired, a “manual” DIP-switch setting on the front panel bypasses the
function of the position of its respective front-panel gain control.
AT-MX351a’s automatic switching and attenuation functions, causing the unit to behave like a conventional mixer. In this mode, the relative level of each microphone is strictly a function of the position of its
NOMA (Number of Open Microphones Attenuated)
respective front-panel gain control.
The NOMA system helps control feedback by allowing for the increase in system gain that
NOMA (Number of Open Microphones Attenuated)
occurs when the number of open microphones increases. A built-in matrix in the AT-MX351a
The NOMA system helps control feedback by allowing for the increase in system gain that occurs when
recognizes exactly how many microphones are on and automatically adjusts the gain accord-
the number of open microphones increases. A built-in matrix in the AT-MX351a recognizes exactly how
ingly. Because use of NOMA is not always appropriate or desired, the AT-MX351a is shipped
many microphones are on and automatically adjusts the gain accordingly. Because use of NOMA is not
with the NOMA function switched off.
always appropriate or desired, the AT-MX351a is shipped with the NOMA function switched off.
5
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