A great solution in situations where there is sound engineer.

Equipped with optional computer control, the Audio Technica AT-MX381 SmartMixer is the latest addition to Audio-Technica's family of automatic mixers. This microprocessor-controlled automatic mixer is designed to provide automatic mixing functions for installed sound, house of worship, broadcast and conference applications. Engineered for intuitive, easy-to-use operation, the rackmountable SmartMixer automatically keeps the number of open microphones to a minimum, bringing background noise and feedback under control and providing increased clarity and audio quality.

Audio-Technica AT-MX381 SmartMixer Eight-Channel Automatic Mixer Features:

8 balanced inputs allow use with both mic and line-level signals
Each input provides: 48V Phantom power (individually selectable), Individual gain and volume controls, Gate attenuation (adjustable), and Low-cut filter (individually selectable via SmartMixer Software)
An RS232 data port provides a connection point for a PC with included SmartMixer Software
Compatible with Crestron and AMX systems
External control capability enables the SmartMixer to activate other devices
Selectable NOMA (Number of Open Mics Attenuated) circuitry helps control feedback
Priority pre-select feature allows priority of each microphone to be independently assigned
Last Mic On selectable for continuous room ambiance
Linking capability for 16 units (up to 128 channels)
A direct output connection is available for each input
Equipped with two audio outputs (one balanced, one unbalanced) to drive amplification systems or other equipment
Monitor headphone output with level control
Basic functions are configured via front panel; detailed settings through SmartMixer Software
Mounts in a single 19" rack space via integral rack mount

Audio-Technica AT-MX381 SmartMixer Eight-Channel Automatic Mixer Specifications:

Input impedance: Mic: 6,600 ohms; Line: 8,500 ohms
Output impedance:
Balanced: Line: 300 ohms; Mic: 350 ohms
Unbalanced: 400 ohms
Direct Out: 60 ohms
Maximum input level: -50 dBV (gain at max.)
Maximum output level: +22 dBm (THD+N at 1%)
Maximum monitor output: 50 mW (@ 1% THD+N) with 16 ohm load
Maximum gain: 69 dB
Frequency response: 20 Hz to 20 kHz
Equivalent input noise: -130 dBV
Microphone phantom power: +48V DC
Control voltage out: +4V DC
Power supply: 100V/240V AC (auto-select), 50/60 Hz, 20W
Operating temperature: 32° to 104° F (0° to 40° C)
Dimensions: 16.93" (430 mm) W x 9.05" (230 mm) D x 1.75" (44 mm) H (including feet, knobs and connectors)
Weight: 8 lbs. 6 oz (3.8 kg)