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 8 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.
Important caution for service personnel making internal adjustments
High voltages are present when the unit’s power cord is plugged into an electrical outlet. Service
personnel should not make any internal adjustments with power cable connected. Disconnect
the power cord from its source before removing equipment cover, because of the danger of touch-
ing an internal high voltage part. Also, to avoid injury, take care not to touch any sharp edges
within the unit, its top panel or interior sections.
What is a SmartMixer
®
?
The AT-MX341b SmartMixer
®
Automatic Microphone Mixer is a microprocessor controlled, auto-
matic 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-MX341-model 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 micro-
phone 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 auto-
matic 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-MX341b’s automatic switching and attenu-
ation 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
Summary of Contents for AT-MX341b SmartMixer
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