SCM820 Digital IntelliMix® Automatic Mixer


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The Shure SCM820 is an 8 Input-channel/2 Output-channel digital automatic mixer designed for use in speech applications, including: sound reinforcement, broadcasting, and recording. It uses proprietary IntelliMix® technology to dramatically improve audio quality in any application where many channels of microphones need to operate simultaneously. Multiple I/O configurations and networking options ensure analogue and digital connectivity between devices.

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  • Features
  • Specs
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IntelliMix® Technology

  • Delivers seamless automatic mixing and reduced background noise through dynamicDynamic mics have a simple, rugged construction and can handle very high sound pressure levels.Read moreGo to the glossary channel gating and attenuation
  • NAT (Noise Adaptive Threshold) continuously adjusts the activation threshold for opening a channel.
  • Number of Open Microphones Attenuation (NOMA) determines the amount of gain attenuation for a mix output when the number of active microphones changes.
  • Last Mic Lock-On (LMLO) keeps the most recently activated microphone open until another microphone is activated in order to maintain a perceived ambient sound during long pauses
  • MaxBus ensures that only one channel is opened per sound source, reducing comb filtering for clear and intelligible speech.
  • IntelliMix® Modes offer four different mixer mode presets of reliable automixing styles (Classic, Smooth, Extreme, Custom) as well as Manual Mixing mode to quickly tailor the mix for a particular application.


Enhanced I/O support for greater application flexibility and digital connectivity

  • DB25 or logic-enabled block connector models available, each with 8 inputs
  • Per channel direct outputs for use as an insert to a mixing console or recording
    Mix A and B outputs with selectable mic or line level, connect to a sound reinforcement system, mixing console, or recording device.
  • Dual mixer operation enables routing of independent automixes to the mix A and B outputs, allowing two entirely different mixes to result from the same set of inputs.
  • Aux inputs (front panel:3.5 mm, back panel: block connector) easily connect to media players
  • ¼” (6.35 mm) stereo headphone output for channel solo and mix monitoring

Comprehensive Control

  • Channel control knobs allow quick adjustment of gain, limiter and EQ settings, and solo/mute functions on input channels
  • Output mix controls and meters enable front-panel master gain and limiter control as well as signal monitoring
  • LED meter rings display input audio, IntelliMix gain levels or EQ settings for each input channel
  • Browser-based control software delivers comprehensive software control, monitoring, routing and configuration of all signals and settings and adds a parametric 8-band EQ (incl. High- and Low-shelf EQ)

Advanced Networking

  • Standard Ethernet or Dante™ digital networked audio configurations available
  • Dante-equipped models enable multi-channel audio networking over Ethernet.
  • Dante Upgrade card available for standard Ethernet models
  • Link Dante-equipped SCM820s to form large automixes of up to 12 units (96 channels of audio)
  • Control system compatible (AMX, Crestron).

Available System Configurations

  • SCM820: Eight Channel Digital Automatic Mixer, Block Connectors
  • SCM820-DAN: Eight Channel Digital Automatic Mixer, Block Connectors, Dante™ Digital Audio
  • SCM820-DB25: Eight Channel Digital Automatic Mixer, DB25 Connectors
  • SCM820-DAN-DB25: Eight Channel Digital Automatic Mixer, DB25 Connectors, Dante™ Digital Audio


  • Frequency ResponseThis is the range of frequencies, from the lowest to the highest, that a mic can pick up.Read moreGo to the glossary: 20 Hz - 20 kHz
  • Dynamic RangeThis is the difference between the queitest and loudest sound that a mic can pick up.Read moreGo to the glossary: Analogue-to-Analogue: 110 dB | Analogue-to-Dante, Dante-to-Analogue: 113 dB
  • Sampling Rate: 48 kHz
  • Conversion: 24 bit
  • Maximum input level:

    Channel Inputs

    • Line (+0): +20 dBV
    • Mic (+26): -6 dBV
    • Mic (+46): -26 dBV
    • Aux Input: +10 dBV
  • Propagation Delay: < 0,51 ms
  • Operating Voltage: 100 to 240 V AC, 50-60 Hz, 1 A
  • Dimensions: 44 mm x 483 mm x 366 mm (1.7 in. x 19.0 in. x 14.4 in.), H x W x D
  • Weight: 5500 g
  • Further Technical Specifications:
    • Operating Temperature Range: −18°C (0°F) to 63°C (145°F)
    • Analogue Connections Configuration: Channel Input, Mix output: Active balanced
      Aux Input: Stereo unbalanced
      Direct Output: Impedance balanced
    • Phantom Power: 48 V DC, selectable per channel, 7 mA max.
    • Max Output Level: Line (+0): +20 dBV, Line (-20): 0 dBV, Mic (-46): -26 dBV
    • Gain Adjustment Range: Channel Input, Mix Output: −110 dB to +18 dB
    • Input Processing: Low cut, high shelf
    • Output Processing: 8 band PEQ (incl. one low- and one high-shelf filter), limiter
    • Networking Interface: SCM820: Single Port, 10/100 Mbps Ethernet
      SCM820-DAN: Dual Port, Gigabit Ethernet, Dante digital audio


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