Audio Technica AT-MX341a SmartMixer Installation And Operation Manual
AT- M X 341a S mar t M ixe r
®
Four-channel Automatic Microphone Mixer
Installation and Operation
Contents
Introduction
.......................................................................................................................
3
What is the SmartMixer®? .......................................................................................................
3
Features .....................................................................................................................................
3
Front Panel ................................................................................................................................
4
Rear Panel .................................................................................................................................
5
Installation and Setup
................................................................................................
6
Priority Microphones and Lockout Bus .................................................................................
6
Preamplifier Gain .....................................................................................................................
7
Output Gain ..............................................................................................................................
7
Phantom Power ........................................................................................................................
7
Output Level LED Meter ..........................................................................................................
8
Adjusting “Off” Attenuation ...................................................................................................
8
Control Voltage Out .................................................................................................................
9
Daisy-chaining Mixers ...........................................................................................................
10
Rack Mounting ........................................................................................................................
10
Security Caps ..........................................................................................................................
10
Specifications
.................................................................................................................
11
Warranty
.............................................................................................................................
12
2
Warning
To avoid electrical shock, do not open the cabinet. Refer servicing to qualified personnel only.
Do not expose this apparatus to drips or splashes.
Do not place any objects filled with liquids such as vases on the apparatus.
Do not install this apparatus in a confined space such as a bookcase or similar unit.
The apparatus should be located close enough to the AC outlet so that you can easily grasp the AC adapter plug at
any time.
Compliance with FCC rules (USA only)
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation.
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.
Note:
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 area. 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 (Canada only)
This Class A digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe A est conforme á la norme NMB-003 du Canada.
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 7 for details.
What is the SmartMixer?
The AT-MX341a SmartMixer®Automatic Microphone Mixer is a microprocessor controlled,
automatic switching, four-channel microphone mixer.
The microphone inputs are XLRF-type balanced, with 12-volt phantom power available on
pins 2 and 3. The output is XLRM-type balanced, non-inverting.
AT-MX341a mixers 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.
Features
To custom-tailor conferencing needs, the mode of each microphone channel can be independently switched via the front panel “priority pre-select” DIP switches. The combination of
switch settings results in three different modes of priority selection/operation.
In any of the three modes of automatic operation, when everyone stops talking, the last
microphone “on” will remain “on.” In a teleconferencing, recording, or broadcast application,
this feature will provide continuous room ambience. This feature is cascaded throughout all
linked mixers so that only one microphone in the entire system will remain on.
Each input channel has an independent gain control on the front panel. Substantial gain
reserve and adjustment range permits microphones of widely differing sensitivities to be used
together successfully.
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 20 dB if
desired. (See page 8, “Adjusting ‘Off ’ Attenuation.”)
A “manual” setting on the front panel bypasses the AT-MX341a’s automatic switching and
attenuation functions, causing the unit to behave like a conventional 4-channel mixer. In this
mode, the relative level of each microphone is strictly a function of the position of its respective
front-panel gain control.
3
AT-MX341a 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. Output Level LED meter. Indicates RMS output level of the mixer. “Zero” (0) level is
factory calibrated for an output of +4 dBm into 600 ohms (Master Level control fully
clockwise). Can be set for peak output level indication via internal switch (see page 8).
6. Priority Pre-select switches. A switch in the “up” position assigns the respective
channel priority over the other channels. A priority channel can not be locked out by
other channels. Any combination of priority/non-priority selections is allowed.
7. Master Level control. Normal setting is fully clockwise (full output). If reducing the
mixer’s output is necessary, carefully turn the control counter-clockwise as needed with
a small screwdriver. Once set as desired, the control may be protected from unauthorized
adjustment by covering the panel hole with a sticker provided with the security caps.
(This control does not affect the meter indication.)
8. Master Threshold/Manual control. Sets the reference level that must be exceeded
for a microphone to be considered “in use.” Adjust to keep background noise level from
triggering microphones. “Manual” setting bypasses all of the SmartMixer’s automatic
functions.
9. Lockout LED indicator. Shows when lockout bus is active. Also aids in setting
Master Threshold.
Figure 1. Front panel
Gain 4Gain 3Gain 2Gain 1
Power
AUTOMATIC MICROPHONE MIXER
Selected Channel
AT-MX
341a
Master
Threshold
Manual
Master
Level
Lockout
Output Level
-20 -10 -6 -3 0 +3 +6
Priority Pre-select
1
2
3
4
➋
➌
➏➍
➊
➐➒
➎
➑
4
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