AT-MX381 SmartMixer ® 8 Channel Automatic Mixer
8 Channel Automatic Mixer Installation and Operation Warning Important Safety Instructions 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. 1) Read these instructions. 2) Keep these instructions. 3) Heed all warnings. Caution 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.
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 via the included SmartMixer Software to achieve any combination of mic- and line-level input/output. Refer to Software Manual for more information.
b. P48 – LED lights green when channel phantom power is on. AT-MX381 Front Panel c. PRIORITY – LED lights green when channel is set for priority mode. (Note: When input attenuator is on (Line level input), the P48 phantom power supply is disabled.) Figure 1 - AT-MX381 Front Panel - Control Layout (Page 9) 1. Input Trim Control – (Outer knob) 11. Headphone Jack (1/4” stereo type) Adjusts the input signal sensitivity for the channel. Connect stereo headphones to monitor mixer’s output. 2.
Control Function Table Many AT-MX381 functions can be configured and accessed over the RS232 data port by a PC running the SmartMixer Software (included) or by an external control system (Crestron® or AMX®) using “Open Disclosure Protocol.” This capability along with the contact closure inputs and control voltage outputs accessed through the External Control Connector provides for maximum flexibility when interfacing the AT-MX381 to other equipment.
Priority Microphones and the Lockout Bus (Channels 1-8) Preamplifier Gain Once the Input Level controls have been properly adjusted, an audio signal appearing in any channel causes the lockout control bus to activate. The priority settings associated with each input channel then determine whether or not a particular mic is affected by lockouts caused by other mics. The SmartMixer has a substantial gain range, allowing it to accept a wide variety of microphones and line level input sources.
Preamp Outputs Using Force-on/Force-off Each microphone channel has an independent unbalanced preamp output that is separate from the main mixer output. This is the Direct Output pin on the block screw connector for each input. This is helpful when it is necessary to record the output of each individual channel, whether or not it is the active mixer output (as is required, for example, in some courtroom proceedings).
S p e c i f i c a t i o n s† RS232 Data Port 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.
Figure 1 - AT-MX381 Front Panel - Control Layout ① ② Input 1 ⑤ Input 2 Input 3 Input 4 Input 5 Input 6 Input 7 Input 8 ⑥ ⑬⑫ 8 CHANNEL AUTOMATIC MIXER AT-MX381 Master Mas ter AT T. LEVEL GATE GA MIN LEVEL MAX P48/ P4 AT T. GAIN ③ GATE GA MIN LEVEL MAX P48 / P4 ATT. T. GATE GA GAIN MIN LEVEL MAX GAIN P48 / P4 ATT. T. GATE GA MIN LEVEL MAX GAIN P48 / P4 ATT. T. GATE GA MIN LEVEL MAX GAIN P48 / P4 ATT. T. GATE GA MIN LEVEL MAX P48 / P4 AT T.
