SCM820 Digital IntelliMix® Automatic Mixer 27A20290 Rev.
IMPORTANT SAFETY INSTRUCTIONS 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. READ these instructions. KEEP these instructions. HEED all warnings. FOLLOW all instructions. DO NOT use this apparatus near water. CLEAN ONLY with dry cloth. DO NOT block any ventilation openings. Allow sufficient distances for adequate ventilation and install in accordance with the manufacturer’s instructions.
Table of Contents Table of Contents 1 Dante Software by Audinate Overview 2 Dante Virtual Soundcard IntelliMix® Operating Principles Mixer Modes Dual Mixer Operation DFR and Audio Processing Networking Model Variations SCM820 Description Front Panel Rear Panel Dante Controller 2 2 2 2 2 2 3 3 4 Signal Path Diagram 5 Operating the Mixer 6 Front Panel Modes Audio Mute and Bypass Monitoring 6 6 6 The SCM820 Graphical User Interface 7 Installation 8 Graphical User Interface (GUI) Accessing t
Overview The Shure SCM820 is an 8-channel digital automatic mixer designed for use in speech applications, including sound reinforcement, broadcasting and audio recording. It dramatically improves audio quality in any application where multiple microphones are required. The mixer uses IntelliMix® technology to select channels to open to the mix bus, while attenuating other channels. The mixing mode is selectable to allow a range of automatic mixing styles.
SCM820 Description ④ gain 1 SCM820 2 ⑨⑩ ⑫ ⑬ ⑤ IntelliMix® 3 4 5 6 7 MASTER 8 A B AUX IN LIM A B 0 low cut -9 hi shelf -18 gain meter limiter -24 -36 power HEADPHONE ethernet network audio automix link dual mixer -48 L+R SUM -60 push to solo | hold to mute ① ② ③ Front Panel lockout ⑥ ⑦⑧ ⑪ ⑭ ⑮ ⑩ Mix Status Indicator ① Channel Mode Selection Press the button to select the function of the channel knobs and monitor LED rings.
IN + IN + A INTELLIMIX manual A classic + + + + + + + + + CH B direct out 8 7 direct out 6 direct out direct out 5 direct out 4 direct out 3 2 direct out phm 48 VDC dual mixer 1 direct out AUX IN MIX OUTPUTS INTELLIMIX A smooth DIRECT OUTPUTS 1-8 classic ⑮ CH B line +0dB mic +30dB mic +46dB extreme secondary custom MIX A reset CHANNEL B manual INPUTS 1-8 lockout auto link ⑭ A L +R SUM line +0dB mic +30dB mic +46dB extreme custom ④ ⑤ ⑥ ⑧⑩ A INTEL
Signal Path Diagram The following diagram shows the audio signal path and the routing options for several features (default configuration shown). Use the GUI to change the configuration.
iiiii iiiii iiiii i iiii 2 3 low cut 4 5 6 3 7 8 AUX IN MASTER AUX IN A B A 0 -9 -18 gain hi shelf limiter 4MASTER SCM820 LIM -24 -36 B power ethernet -60 push to solo | hold to mute HEADPHONE network audio automix link dual mixer -48 L+R SUM meter lockout 5 A -∞ dB +18 dB +0 dB low cut-90 -18 hi shelf-24 -36 ch. meter-48 i i i -60 i i push to solo | hold to mute gain low cut gain gain iiiii ii ii i iiii hi cut shelf low ch. meter higain shelf ii ii i low cut ch.
The SCM820 Graphical User Interface Graphical User Interface (GUI) The SCM820 graphical user interface (GUI) enables comprehensive control of the mixer from a web browser. The GUI is hosted from a webserver embedded on the SCM820, and is accessible from any computer on the network. Use the GUI for the following functions: • • • • • • Manage mixers from a remote location. Customize IntelliMix parameters. Form large automixes with custom link groups. Assign the direct outputs in the signal path.
Installation Power Furnished Accessories IN + IN + IN + INTELLIMIX A B manual CHANNEL A smooth classic + + + + + + + + B direct out 8 7 direct out 6 direct out direct out 5 direct out 4 direct out 3 2 direct out direct out line +0dB mic +30dB mic +46dB extreme + secondary custom mix b CH 00:0E:DD:AA:BB:CC IN + gate mute ovrd gnd IN + gate mute ovrd gnd IN + gate mute ovrd gnd IN + gate mute ovrd gnd IN + gate mute ovrd gnd LR gate mute ovrd gnd AUX IN g
Configuring the Inputs and Outputs Unless where noted, configurations can be made from the hardware or from the GUI. Inputs Direct and Mix Outputs ① Select the Audio Source (GUI only) • Analog (default): Audio is from a microphone or line-level audio source connected to a channel input on the mixer back panel. • Network: Audio is from the Dante digital audio network. Go to the Inputs tab of the GUI to select Network audio for each desired channel.
Setting IntelliMix The SCM820 uses IntelliMix to select channels to open in a mix, while attenuating the gain of closed channels. IntelliMix is available in three presets and can be customized to excel in any application where multiple microphones are used at once. In all modes (except Manual), MaxBus ensures that only one channel is opened per sound source. Mixer Mode Descriptions The SCM820 features five mix modes: Classic, Extreme, Smooth, Custom or Manual.
IntelliMix Parameters Gating Style Off Attenuation Determines the way gain is applied to open channels. Full Channels open at full gain (as adjusted by the NOMA factor). Relative Channels open at a gain level that varies with the input signal level— quieter signals receive less gain than loud signals. As the input signal level increases, more gain is applied to the channel. The amount of attenuation applied to closed channels.
Networking Network Overview For most installations, the SCM820 can connect to a computer either directly or though a network switch ("Link-Local" connections). Connect multiple mixers to a switch in a star configuration to ensure reliable networking (each unit connects directly to the switch). In some cases, computer settings or programs may interfere with the network. The majority of these connection issues can be solved by using a DHCP-enabled router*.
Network Modes The Dante network interface can be configured to operate in one of three modes: Switched, Redundant Audio or Split. This setting determines the types of data that are transported from the Primary and Secondary ports. Data Transport in each Mode The following table displays the configuration of the Dante network ports in each Network Mode. Note: Always connect the Primary port to the network that is used for Shure Control.
Redundant and Split Networks The Primary and Secondary ports require dedicated network switches in Redundant Audio and Split modes. Configuring a 100 Mbps Dante network Gigabit equipment is strongly recommended for Dante network.
Application Examples line +0dB mic +30dB mic +46dB A smooth Setting up a Link Group classic CH B extreme + Link Groups are + managed from the Link Group tab of the GUI. Once a mixer phm 48 VDCLink LEDs will joins a group, its front panel Network Audio and Automix lockout mixer illuminate green. Up to 12 mixers dual can join a group auto at link a time.
Internet Calling Dante-enabled mixers integrate software applications such as Skype , Lynctm, Voice. This enables multiple microphones to participate in a teleconferencing event. tm 1. Reference the Installation section to properly connect and setup microphones to the mixer back panel. 2. Open the IntelliMix tab of the GUI. 3. Select Dual Mixer operation. 4. In the GUI, route channels 1 - 8 to Mix A only (deselect routing to Mix B). 5. In the Inputs tab, set the Aux channel to Network input source. 6.
Digital Feedback Reduction (DFR) DFR uses Shure’s patented Adaptive Notch Filter algorithm to discriminate between feedback and non-feedback sounds. It automatically detects feedback and deploys narrow-band notch filters at the feedback frequencies. DFR filters are narrow enough to prevent any coloration of the audio program. No sound system (the combination of microphones, mixing, signal processing, power amplifiers, loudspeakers and room acoustics) produces an absolutely flat response.
Assigning DFR Two DFR blocks are assignable to any channel input or mix output. When using two or less microphones, assign the DFR to those channels to prevent feedback from routing to the mix bus. Additionally, if a microphone is designated for a chairperson or host, DFR should be applied to that channel to ensure that remains stable and does not feed back.
GUI Description Navigation Bar ② ③ ④ ⑤ ① ⑥ ⑦ 1) Tabs The GUI is separated into six tabs that are used for different functions: • Input: Setup and management of input channels 1-8 and Aux • IntelliMix: Select Mix mode and load/save Customize IntelliMix settings • DFR: Set up and monitor Shure Digital Feedback Reducer (DFR) for up to two channels • Output: Assign the direct output and manage Mix A and Mix B outputs • Link Group: Manage the Link Group status of devices • Preferences: Configure network
Input Tab ① ② ③ ⑤ ⑥ ⑦ ⑧ ⑮ ④ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ 1) Channel Name Channel names can be customized with up to 31 any characters in length except ‘=’,’.’ or ‘@’. 2) Source Sets the audio input to one of two sources: • Analog (default): Audio is from a microphone or line-level audio source connected to a channel input on the mixer back panel. • Network: Audio is from the Dante digital audio network. Dante Controller software is required to properly route audio to the channel inputs.
Intellimix Tab ① ④ ② ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ③ ⑮ ⑯ ⑰ ⑱ ⑲ ⑫ ⑳ ⑬ 21 ⑭ 22 23 Mixer Settings 1) Mixer Type The SCM820 can be set to operate as a single or dual mixer: • Single Mixer: Channels are routed to a single mix bus that sends the same audio to both Mix A and B outputs. This allows the same program to be sent to different rooms or recording applications. The output gain, parametric equalizer and limiter can be set separately for each mix.
① ④ ② ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ③ ⑮ ⑯ ⑰ ⑱ ⑲ ⑫ ⑳ ⑬ 21 ⑭ 22 23 14) Mute Control Determines the location of a channel mute in the mixer’s signal path. • Pre-IntelliMix: the signal mutes prior to the Intellimix bus. • Post-IntelliMix: the signal goes to the mix bus and is muted after it contributes to IntelliMix decisions (such as MaxBus and NOM). Mix Outputs 15) Mix Name Displays Mix Output name, set from the Mix Output tab. 16) Gating Style Determines the way gain is applied to open channels.
Digital Feedback Reduction (DFR) Tab ① ② ⑥ ⑦ ⑧ ③ ⑨ ⑤ ⑩ ⑪ ⑫ ⑭ ④ ⑮ ⑬ 1) Enable/Disable Button Click this button to enable or disable the DFR notch filtering. It automatically turns on when DFR is assigned to a channel. When disabled, the DFR filters are turned off. • Green= enabled • Gray= disabled 2) Channel Assignment Assign the DFR block to an input channel or mix bus. 3) # of Filters Adjust the maximum number of filters from 1 to 16 (default).
Output Tab ① ⑥ ⑦ ⑧ ⑨ ⑩ ② ③ ④ ⑤ ⑪ ⑫ ⑬ Direct Output 1) Channel Name Displays the channel name as defined in the Inputs Tab.
Link Group Tab SCM820 Auto SCM820-1 Group 1 SCM820-2 SCM820 SCM820-3 SCM820-1 SCM820-4 SCM820-5 ② SCM820-6 ① ⑤ ⑥ SCM820-3 SCM820-4 SCM820-5 SCM820-6 ③ ④ 1) All Devices List Master list of all available SCM820 Dante units on the network. • Drag and drop the devices to a Link Group or the Stand Alone Window. • Select a device to view its location in either the Linked or Stand Alone device windows.
Preferences Tab 22 Device 1) Device Name Device names can be customized with up to 31 any characters in length except ‘=’,’.’ or ‘@’. 2) Push to Dante Name Overwrites the device and channel names in Dante Controller (DC) software. Note: Use with caution, as this could break the routing configuration in DC and cause audio interruptions. 3) Dante Device Name The name of the device in Dante Controller. 4) Device Serial Number Unique identification of the mixer. Use the number to register the unit at shure.
22 14) Interface Click to view audio and control data routing for each interface. 15) IP Settings Displays the network settings for each port: • Auto: For automatic DHCP or Link-Local IP addresses • Manual: For Static IP addresses 16) Network Speed Indicates the speed of the network. 17) Dante Latency The latency setting for Dante devices should be set according to the number of switches in the network. The SCM820 network card has an internal switch chip and counts as a switch.
Log On Page This page is only displayed after a password has been set from the Preferences tab, establishing an Administrator log in. When there is no Administrator, there are no restrictions changing a device’s settings. Note: No more than five Administrators or Guests should be logged on to a device’s GUI at the same time. Opening more instances may degrade system performance. 1) User When a password is set, there are two levels of access for the GUI: • Admin: Full editing rights.
Audio Troubleshooting Problem Distorted audio Indicator Solution Channel Status LED = Flashing Red • Set Analog Input to a lower level Mix Output meter = Clipping • Turn down master gain Channel LEDs in Channel Meter mode (front panel) = Off • Check cables • Enable Phantom power for condenser microphones • Check Input Gain Level Mix Output meters = Off • Ensure mix is unmuted • Turn up Master volume knob • Check channel routing from IntelliMix tab of the GUI • Check Link Group and Network LEDs (
Event Log The event log provides a detailed account of mixer activity from the moment the mixer is powered on. The log collects up to 1,000 activity entries for the mixer, and time-stamps them relative to the last power cycle. To troubleshoot audio or hardware problems, press Save Log to export to a computer file. Refer to the log file for details when troubleshooting or consulting with Shure Systems Support.
Specifications Audio Frequency Response Digital Signal Processing Dynamic Range AD/DA Converter 20 Hz to 20 kHz (±1 dB) 24-bit, 48 kHz, 113 dB dynamic range typical 20 Hz to 20 kHz, A-weighted, typical Analog-to-Analog 110 dB Analog-to-Dante, Dante-to-Analog 113 dB Internal Processing 32-bit Latency From channel input to mix output, Estimated Nominal, ±0.
IP Ports and Protocols Shure Control Port TCP/UDP Protocol Description 21 tcp FTP Required for firmware updates (otherwise closed) Closed 22 tcp SSH Not supported Closed 23 tcp Telnet Standard console interface Closed 68 udp DHCP Dynamic Host Configuration Protocol Open 80* tcp HTTP Required to launch embedded web server Open 427 tcp/udp SLP Required for inter-device communication Open 443 tcp HTTPS Not supported Closed 161 tcp SNMP Not supported Closed 162 tcp
Connector Diagrams +48V Out-Z 6.81k + Out-Z 6.
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