Specifications

8
The RS232 data port provides a place to connect a PC computer for system
configuration using the included SmartMixer Software. (Refer to the Software
Section for installing/using the software.) Alternatively, the data port may be
used to connect to an external control system such as Crestron® or AMX®
running “open disclosure communications protocol”. Refer to information from
control system manufacturer regarding using this feature.
In a system with multiple linked AT-MX381’s, connect the PC or control system
to the first (Master) unit in the chain. This will allow access to all of the linked
units for configuration and control programming.
RS232 Data Port
The AT-MX381 is designed to mount in a standard equipment rack occupying
a single rack space. For tabletop mounting, attach the included feet to the bot-
tom of the unit.
Rack Mounting
For permanent installations where microphone selections, positions and
acoustic conditions are constant, it may be advantageous to lock out the front
panel knobs and functions to prevent unauthorized adjustments. To initiate
Lockout, activate the lock switch or activate the lock function via the
SmartMixer Software. (PC)
Control Lockout
Specifications
†
Input Impedance
Mic Level 6600 ohms
Line Level 8500 ohms
Output Impedance
Balanced
Line Level 300 ohms
Mic Level 350 ohms
Unbalanced 400 ohms
Direct Output 60 ohms
Maximum Input Level -50 dBu (gain at Max)
Maximum Output Level 22 dBm (THD+N at 1%)
Equivalent Input Noise Level -130 dBu *
Total Harmonic Distortion
>
0.3% (Channel gain at max)
Maximum Gain 69 dB
Frequency Response 20 to 20,000 Hz (±3 dB)
Microphone Phantom Power +48V DC
Control Voltage Out +4V DC
Maximum Monitor Output 50mW (@ 1% THD+N) with 16 ohms load
Power Supply 100 – 240V AC, 50/60 Hz, 20W
Dimensions 16.93” (430 mm) W x 9.05” (230 mm) D x
1.75” (44 mm) H
(not including feet, knobs and connectors)
Weight 3.4 kg (8 lb 6 oz)
†
In the interest of standards development, A.T.U.S. offers full details on its test methods to other industry
professionals on request.
* Input terminated with 150 Ohm, A-Weighted using Audio-Precision System Two
*Specifications are subject to change without notice.
AMX® is registered trademarks of AMX Corporation.
Crestron® is registered trademarks of Crestron International.