Shure SCM820 Digital IntelliMix Automatic Mixer (Discontinued)

Availability: Discontinued
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Shure SKU: SCM820
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The following product has been discontinued.

Spec Sheet

Designed for use in speech applications including sound reinforcement, broadcasting, and recording, the SCM820 uses IntelliMix® technology to dramatically improve audio quality when many channels of microphones need to operate simultaneously.

Multiple I/O configurations and networking options ensure analog and digital connectivity between devices.

Select a Combination SCM820: Digital IntelliMix Automatic Mixer, Block Connectors SCM820-DAN: Digital IntelliMix Automatic Mixer, Block Connectors, Dante Digital Audio SCM820-DAN-DB25: Digital IntelliMix Automatic Mixer, DB25 Connectors, Dante Digital Audio SCM820-DB25: Digital IntelliMix Automatic Mixer, DB25 Connectors

IntelliMix Technology

  • Delivers seamless automatic mixing and reduced background noise through dynamic 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
  • MaxBus ensures that only one channel is opened per sound source, reducing comb filtering for clear and intelligible speech
  • IntelliMix Modes offer five different mixer mode presets of reliable automixing styles (Classic, Smooth, Extreme, Custom, or Manual) 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 allow the SCM820 to be used as an insert processor
  • 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 on both the front and back panel 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 or IntelliMix gain levels for each channel
  • Windows® 10 control software delivers comprehensive software control, monitoring, routing, and configuration of all signals and settings and adds a parametric 8-band EQ
  • Works with SystemOn Audio Asset Management Software

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 SCM820 mixers to form large automixes of up to 12 units (96 channels of audio)
  • Control system compatible (AMX, Crestron)

Digital Feedback Reduction

  • Two channels of patented Shure DFR (Digital Feedback Reduction)
  • Assignable to input channels and mix outputs
  • Automatic feedback detection and filter deployment
  • 16 filters per channel
  • 25 Hz to 20 KHz bandwidth
  • Up to 18 dB gain reduction per filter
  • High Q filter width (1/70th octave)
  • “Freeze” feature that locks depth and frequency of existing filters to avoid unwanted automatic changes
Analog Performance
Channel Input Level Monitoring Configuration: Active Balanced 


Impedance: 5 Kilohms 

Clipping Level: Line (-0): +20 dBV, Mic (+26): −6 dBV, Mic (+46): −26 dBV

Phantom Power 48 VDC, Selectable per Channel, 14 mA Maximum
AUX Input Configuration: Stereo, Unbalanced 


Impedance: 10 Kilohms

Clipping Level: +10 dBV

Output Connectors (Analog) Mix Output


Configuration: Active Balanced 

Impedance: 350 Ohms

Clipping Level: Line (±0): +20 dBV, Aux (−20): 0 dBV, Mic (−46): −26 dBV

Output Direct


Configuration: Impedance Balanced 

Impedance: 150 Ohms

Max Output Level: +20 dBV

Headphone Output 1/4" / 6.35 mm TRS, 100 mW, 350 Ohms, Dual Mono (Will Drive Stereo Phones)
Connector Block
Signal Processing
Converter 24-Bit, 48 kHz, 113 dB Dynamic Range Typical
Internal Processing 32-Bit
Latency Analog to Analog


Single Device: 0.51 ms

In a Link Group: 0.76 + 4TN

Processing Channel Input: Gain Adjustment Range: −110 to +18 dB
Low Cut: Corner: 25 Hz to 320 Hz, Slope: 12 dB/Octave
High Shelf: Corner: 5 kHz, Slope: 12 dB/Octave, Gain: −18 to +18 dB

Mix Output: Gain Adjustment Range: −110 to +18 dB
Low Shelf: Corner: 25 Hz to 20 kHz, Slope: 12 dB/Octave, Gain: −18 to +18 dB
High Shelf: Corner: 25 Hz to 20 kHz, Slope: 12 dB/Octave, Gain: −18 to +18 dB
6-Band PEQ: 25 Hz to 20 kHz, ±18 dB, Bandwidth: 1/70 to 4 Octaves
Limiter: Ratio: 10:1
Threshold: −50 to −2 dBFS
Attack: 0.1 ms
Decay: 100 ms
Network Interface Single Port, 10/100 Mb/s Ethernet
Cable Requirements Cat 5e or Higher, Shielded, 328' / 100 m Maximum
Network Addressing Capability DHCP, Link-Local, Static
Dynamic Range Analog to Analog: 110 dB (20 Hz to 20 kHz, A-Weighed, Typical)
Output Noise Output Pad
Line (+0): -90 dBV
Aux (-20): -110 dBV
Mic (-46): -135 dBV
At 20 Hz to 20 kHz, A-Weighted, One Channel Open
Equivalent Input Noise Input Gain Setting
Line (+0): -93 dBV
Mic (+26): -118 dBV
Mic (+46): -130 dBV
At 20 Hz to 20 kHz, A-Weighted, Input Terminated with 150 Ohms, Digital Gain at +18 dB
THD + N < 0.05%
1 kHz, +4 dBu Out, Mix Output (Master) at +0 dB
Common Mode Rejection Ratio > 70 dB
150 Ohms Balanced Source, at 1 kHz
Polarity Non-Inverting, Any Input to Any Output
Housing Steel; Extruded Aluminum
Power Requirements 100 to 240 VAC, 50 to 60 Hz, 1 A
Operating Temperature Range 0 to 145°F / -18 to +63°C
Storage Temperature Range -20 to +165°F / -29 to +74°C
Dimensions 1.7 x 19 x 11.4" / 43.1 x 482.6 x 289.5 mm
Weight 12 lb / 5.4 kg
Packaging Info
Package Weight 12 lb
Box Dimensions (LxWxH) 22.126 x 14.882 x 2.913"

At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.

  • Most in-stock orders placed Monday-Friday before 1PM PST ship the same day. Orders placed after 1PM will ship the next day of business. General restrictions apply; please see our full shipping policy here.
  • We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.

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