SmartMixer Five-channel Automatic Mixer

SmartMixer Five-channel Automatic Mixer
SmartMixer Five-channel Automatic Mixer


The AT-MX351 automatic mixer is ideal for meetings, seminars, teleconferencing, worship services, courtroom proceedings, radio and TV broadcasting and A/V applications. All switching is under microprocessor control with proprietary algorithms for instant, seamless operation. An individual priority pre-select switch for each mic/line channel allows choice of one-channel-at-a-time operation, all active, or any mix of moderator override. The last microphone on stays on so that ambient sound is never muted. Plus, any number of SmartMixers can be linked to create a system for large multi-mic installations. The priority control system extends throughout the entire chain.


  • Four automatic Mic/Line inputs, plus Aux in
  • Automatic threshold setting
  • 48V phantom power individually selectable for each channel
  • Limiters on each mic channel prevent individual channel overload
  • Balanced inputs and output, selectable Mic/Line-level
  • Individual gain controls for each channel
  • Switchable manual mode overrides automatic functions
  • Master output level control
  • Pre- or post-controller audio outputs from Mic/Line channels
  • Off attenuation for each input adjustable to -40 dB
  • Sub-D connector for TTL output, plus closure-control input for external control of each channel
  • NOMA operation provided, can be turned on/off
  • Output level meter with Peak and RMS modes
  • Monitor headphone output with adjustable level
  • Internal AC supply
  • Mounts in a single 19" rack space
  • Includes rack mount adapters
Tech Specs

Technical Specification

Frequency Response 40 Hz to 22 kHz
Impedance Input : Mic: 8,000 ohms Line: 50,000 ohms Aux: 50,000 ohms Link In: 20,000 ohms, Output : Balanced Line: 200 ohms Mic: 300 ohms Unbalanced: 400 ohms Link Out: 100 ohms Preamp Out: 750 ohms
Equivalent Input Noise -128 dBV (150 ohms) at maximum gain
Power Supply 120V/230V AC (switchable), 50/60 Hz, 10W
Monitor 700 mW, 20 ohm load
Audio Output Attenuator 10 dB
Maximum Input Level Mic: -24 dBV Line: +27 dBV Aux: +17 dBV
Max Output level +22 dBm
Maximum Output Level XLR (0 VU) Balanced Line: +4 dBm (600 ohms), +4.4 dBV (open circuit) Mic: -46 dBm (600 ohms), -44 dBV (open circuit) Unbalanced: -10 dBV (open circuit) Preamp Out: -10 dBV (open circuit)
Operating Temerature Range 32° to 104° F (0° to 40° C)
Phantom Power Requirements +48V DC
Dimensions 16.93" (430 mm) W x 9.38" (238 mm) D x 1.75" (44 mm) H (including feet, knobs and connectors)
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