background image

16

Internet Calling

Dante-enabled mixers integrate software applications such as Skype

tm

Lync

tm

, Voice. This enables multiple microphones to participate in a 

teleconferencing event.
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. Route the Aux channel to Mix B only.
7. Open Dante Virtual Soundcard and turn it on.
8. Open Dante Controller (DC) software. 
9. In DC, route the SCM820 tx channel 'Mix A' to computer rx channel 1.
10.  In DC, route computer tx channels 1 and 2 to SCM820 rx channels Aux 

L and R.

11.  Connect Mix B analog output to a speaker or output device.
12.  Open the computer's settings and select Dante as the input and output 

soundcard.

Trademarks: 

Trademarks are the property of their respective owners.

Logic

The logic functions of the SCM820 expand the mixer's range of installation 

and control options. These functions can be hardwired or configured in the 

GUI.
The following hardware logic functions are available for each channel:

Gate Out

Follows channel gating and goes to logic "low" (sinks current) when 

microphone is gated on. 500 mA of current sinking ability is provided.

Mute In

Applying logic "low" (from GATE OUT or a switch closure to logic ground) 

gates channel off (channel output is fully attenuated).

Override In

Applying logic "low" (from GATE OUT or a switch closure to logic ground) 

forces channel on. When both Mute and Override are activated, Mute 

takes precedence.

Logic Ground

Logic ground is distinct from the SCM820 audio ground. Make all logic 

ground connections to this pin, including power supply ground of external 

logic circuitry. To avoid switch clicks, do not connect logic ground to audio, 

chassis or rack grounds.

Suggested Logic Application

This section contains suggestions on the uses of the SCM820's logic 

capabilities. For additional suggestions and solutions to installation 

problems, contact Shure's Systems Support.

Cough Button

The talker can turn off his or her microphone during coughing or private 

conversations by installing an SPST pushbutton switch between the MUTE 

IN and Logic Ground pins for each channel to be modified. When a channel 

is muted, no audio is passed.
Set the mute control to post-IntelliMix setting  (

GUI

 > 

IntelliMix Panel

 

Mute Control

) to ensure that unwanted sounds do not gate on other 

microphones.

Chairperson-Controlled Muting

The chairperson can, by activating a switch, silence all other microphones 

and be heard without interruption. 
1. Set the desired channel to Chairperson Mute to manual (

GUI

 > 

IntelliMix Panel

 > 

Chairperson

 > 

Mute

).

2. Connect the switch to the Override In logic connection for the 

chairperson's microphone.

An alternative to a switch is to set the Chairperson Mute to Auto. In this 

setting, when the chairperson's microphone activates, all other microphones 

mute automatically.

Remote Channel-Open Indicators

Remote indicators can be used to indicate when a talker's microphone 

is on. Connect the LEDs and a 5-volt supply to the GATE OUT pin. To 

avoid switching clicks in the audio output, do not ground the power supply 

negative terminal in the audio system or rack ground. 

Important

: If a single cable is used for the microphone audio signal and the 

LED dc power, separate shielded pairs must be used. Failure to carry the 

DC power on a shielded pair may result in audible clicking due to capacitive 

coupling between the DC power lines and microphone lines.

Disabling the Gating Function (Always On)

Select Always On for the channel(s) that should remain open (

GUI

 > 

IntelliMix Panel

 > 

Always On

.

Inhibiting Gating for Unwanted Sounds

The MaxBus operating principle ensures that the mixer will activate only one 

microphone per sound source. Muting a microphone channel prevents its 

audio from appearing at the mixer's output. However, the muted channel set 

to Post-IntelliMix still communicates with other mic channels via MaxBus. 

A sound source picked up by a muted microphone will not activate other 

microphones. 
Sound sources that may cause unwanted microphone channel activation 

include:

•  A noisy fax machine or printer

•  A squeaky door

•  An intercom system

•  A teleconferencing loudspeaker

The SCM820 can prevent these and similar sounds from activating 

microphones by taking the following steps.
1. Place one microphone near the unwanted sound source. Connect that 

microphone's signal to a channel input. 

2. Mute the channel.
3. Set the Mute Control to Post-IntelliMix (

GUI

 > 

IntelliMix Tab

 > 

Mute Control

).

4. Adjust that channel's gain control just to the level where other 

microphones in the system do not activate for the unwanted sound. If the 

channel gain is set too high, other system microphones will be difficult to 

activate for desired sounds. If set too low, unwanted sounds will continue 

to activate other microphones.

Loudspeaker Muting

Some applications require a loudspeaker to be placed near each talker 

to provide audio reinforcement, or to permit telephone conversation or 

conference monitoring. Each loudspeaker can cause feedback unless it is 

automatically switched off when the talker near it speaks. To provide this 

function, connect the GATE OUT terminal of each channel to a separate 

loudspeaker muting relay.

NOTE: 

A diode across each relay coil is required to suppress inductive 

voltage spikes which may damage the SCM820. 
An alternative to creating a circuit is a Logic Controlled Relay, such as the 

Radio Design Labs (RDL) ST-LCR1. 

“Filibuster” Mode

In normal operation, when several people talk, each microphone gates on 

so that no speech is missed. In “filibuster” action, a microphone that is gated 

on prevents other microphones from gating on. Once a microphone has 

gated on, other microphones cannot gate on until the talker has paused long 

enough for that microphone to gate off. Thus the person talking has the floor 

and cannot be interrupted. 
Set the maximum number of open microphones to 1 (

GUI

 > 

IntelliMix Panel

 > 

Mix A/B

 > 

Max NOM

Summary of Contents for SCM820-DAN

Page 1: ...USER GUIDE 27A20290 Rev 4 2017 Shure Incorporated SCM820 Digital IntelliMix Automatic Mixer...

Page 2: ...r s instructions 8 DO NOT install near any heat sources such as open flames radiators heat registers stoves or other apparatus including amplifiers that produce heat Do not place any open flame source...

Page 3: ...de 11 Single or Dual Mixer Operation 11 Networking 12 Network Overview 12 Digital Audio Networking 12 Dante Software by Audinate 14 Dante Controller 14 Dante Virtual Soundcard 14 Application Examples...

Page 4: ...uting gain across channels to equal one open channel This mode incorporates IntelliMix operating principles into a gain sharing mixing style Extreme Extreme is an aggressive variation of Classic mode...

Page 5: ...Mix B or both for adjustment with the master knob and monitoring on the LED ring and headphone output Note When both Mix A and Mix B are selected the headphone output only monitors Mix A Mix Status In...

Page 6: ...nal path See Configuring the Inputs and Outputs for details on direct output routing Chassis Ground Screw 1 8 Provides an optional connection for microphone shield wire to chassis ground IntelliMix Se...

Page 7: ...B 9 18 24 36 48 60 0 gain limiter L R SUM gain low cut hi shelf meter push to solo hold to mute 1 2 3 4 5 6 7 8 A B HEADPHONE IntelliMix SCM820 AUX IN MASTER lockout power ethernet network audio autom...

Page 8: ...i i i i i i i i i i i gain low cut hi shelf ch meter iiii i i i i i i i i i i i i i i i i gain low cut hi shelf ch meter iiii i i i i i i i i i i i i i i i i iiii i i i i i i i i i i i i i i i i 320 H...

Page 9: ...UM gain low cut hi shelf meter push to solo hold to mute 1 2 3 4 5 6 7 8 A B HEADPHONE IntelliMix SCM820 AUX IN MASTER lockout power ethernet network audio automix link dual mixer LIM A B 9 18 24 36 4...

Page 10: ...ix link dual mixer LIM A B 9 18 24 36 48 60 0 gain limiter L R SUM gain low cut hi shelf meter push to solo hold to mute 1 2 3 4 5 6 7 8 A B HEADPHONE 4 5 OUT L R mix a mix b AUX IN 7 gate IN mute ovr...

Page 11: ...t the signal by 12 dB at 5 kHz with a slop of 12dB octave Direct and Mix Outputs Assign the Direct Outputs GUI Only Assign the Direct Output for each channel from the Output tab of the GUI Pre EQ Afte...

Page 12: ...ssic Shure SCM810 automixer in its default settings It is renowned for fast acting seamless channel gating and consistent perceived ambient sound levels The Classic mode excels in most applications sp...

Page 13: ...er operation by pressing the Dual Mixer button on the back panel or from GUI IntelliMix Tab Example Dual Mixer Applications Set Mix A to Classic mode for sound reinforcement and set Mix B to Smooth fo...

Page 14: ...rements To network SCM820 mixers ensure the setup meets the following requirements Use shielded Cat5e cables or higher Cable runs limited to 100 m 328 ft Devices are on the same subnet Dante Network I...

Page 15: ...60 0 gain limiter L R SUM gain low cut hi shelf meter push to solo hold to mute 1 2 3 4 5 6 7 8 A B HEADPHONE IntelliMix SCM820 AUX IN MASTER lockout power ethernet network audio automix link dual mi...

Page 16: ...ing guidelines Ensure the router has QoS enabled Latency settings are set to at least 1 ms Caution Do not form Link groups on a 100Mbps network as this will cause increased traffic and will exceed the...

Page 17: ...channels appear at the mixer s Mix Outputs Aux Channel The aux channel can be set to Local or Global from GUI Inputs Tab Local Aux keeps the Aux signal from appearing on the mix output of other networ...

Page 18: ...the chairperson s microphone activates all other microphones mute automatically Remote Channel Open Indicators Remote indicators can be used to indicate when a talker s microphone is on Connect the LE...

Page 19: ...nt the system still has insufficient gain before feedback other changes must be made to the sound system such as changing the placement of the microphones and or loudspeakers There are two basic ways...

Page 20: ...d held microphones In this situation feedback frequencies change drastically as the microphone user wanders the room or sound stage Both fixed and dynamic filters will automatically deepen as addition...

Page 21: ...s set the device password assign metering type and engage hardware lockout 2 Device List Displays the name of the mixer as set in the Preferences tab Click the drop down bar and select a device to ope...

Page 22: ...two indicators illuminate green when the channel is open to that mix bus Mix A or Mix B When set to Dual Mixer the A and B indicators function separately for each mix 9 Clip Indicator Illuminates when...

Page 23: ...Tab 6 Routing Routes the channel to the Mix A or Mix B output The routing options depend on the Mixer Type Single Mixer Type the channel can route to both or neither mixes Dual Mixer Type the channel...

Page 24: ...enuation Last Mic Lock On and NOMA are disabled in this setting 18 Off Attenuation Sets the amount of attenuation applied to closed channels This is disabled when the Gain Scaling is set to Adaptive 1...

Page 25: ...lect High Q default or Low Q from the drop down menu High Q 1 70th octave Q 101 Low Q 1 40 octave Q 58 10 New Filter Q This selection designates the width of each new filter as it is deployed by DFR 1...

Page 26: ...70 octave or 100 99Q to very wide 4 octaves or 0 27 Q Gain Sets boost or cut of the EQ setting from 18 to 18 dB 8 DFR Enable Disable Button When DFR is assigned from the DFR tab an enable disable butt...

Page 27: ...Auto Link enabled When a device is placed in a group it will automatically configure the unit to the group s settings 3 Stand Alone Devices List Displays all mixers that function independently of a l...

Page 28: ...der This is post limiter for the mix adjustments 9 IntelliMix Metering Changes the GUI Input meters to display IntelliMix attenuation applied in realtime as displayed with an orange meter Channels tha...

Page 29: ...rm 3 Select Apply to set the password Once a password is set any user can log on as a Guest to view the GUI without changing settings To clear a password and allow anyone full editing rights 1 Log on...

Page 30: ...he GUI 4 Language Sets the language of the GUI This setting is saved to the computer s cookies Event Log The event log provides a detailed account of mixer activity from the moment the mixer is powere...

Page 31: ...that five or less windows are open to the same GUI Disable software meters from GUI Preferences tab See Network section for properly setting up the network Network Audio and Link Groups Problem Indica...

Page 32: ...Error Messages An error message is generated on the Channel LED rings when operating or environmental conditions occur that could potentially harm the mixer These types of messages indicate the mixer...

Page 33: ...utput Level Impedance Balanced 150 20 dBV Headphone Output 6 35 mm 1 4 TRS 100 mW 350 dual mono will drive stereo phones Digital Signal Processing AD DA Converter 24 bit 48 kHz 113 dB dynamic range ty...

Page 34: ...n 5353 udp mDNS Required for device discovery Open 5568 udp SDT Required for inter device communication Open 8023 tcp Telnet Debug console interface Password 8180 tcp Flash Required for web GUI Open 8...

Page 35: ...tom dual mixer 0dB mic 30dB mic phm 48 VDC CH 46dB reset CHANNEL INTELLIMIX B CC B 0E DD AA 00 auto link gate IN Aux Out mute ovrd gnd L R L 1 14 25 13 R GATE OUT LOGIC GROUND MUTE IN OR OVERRIDE IN 1...

Page 36: ...ompleks Harco Mangga Dua Blok L No 35 Jakarta Pusat I 16 GSI31 00501 0211 Europe Middle East Africa Shure Europe GmbH Jakob Dieffenbacher Str 12 75031 Eppingen Germany Phone 49 7262 92490 Fax 49 7262...

Reviews: