Shure M810E manual Description, System Features, Operating Principles

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DESCRIPTION

The Shure Model SCM810/E is an eight-channel automatic microphone mixer designed for use in sound reinforcement, audio recording, and broadcast applications. The SCM810 dramatically improves audio quality in any application where multiple microphones are required. Any low-im- pedance dynamic or condenser microphone (including wireless) can be used with the SCM810/E. Multiple SCM810 mixers can be linked to other SCM810/E mixers, as well as to Shure Models FP410, SCM410, SCM800, and AMS8100 mixers.

Each input channel has a two-band equalizer and three logic terminals. The equalizer reduces unwanted low-frequency audio pickup and makes differ- ent microphone types-lavaliers, boundary and handheld-sound similar. The logic terminals can be used to control external devices.

The SCM810/E operates on 100-120 Vac power; the SCM810E operates on 220-240 Vac power. Each mixer is supplied with a power cord, rack-mounting hardware, and a link cable.

SYSTEM FEATURES

Fast-acting, noise-free microphone selection that automatically

Peak-responding output limiter with selectable thresholds and

 

adjusts to changes in background room noise

 

LED indicator

Automatic gain adjustment as additional microphones are activat-

Active balanced microphone-level XLR inputs and an active bal-

 

ed

 

anced Mic/Line level XLR output

Last Mic Lock-On circuit that maintains ambient sound

Aux-level input with manual level control

Adjustable low-frequency rolloff and high-frequency shelving for

Front-panel headphones output with level control

 

each channel

Linking capability for up to 400 microphones

Channel activation and clipping indicators

OPERATING PRINCIPLES

The operating concept behind the SCM810/E Automatic Mixer is Shure's patented* IntelliMix® circuitry. IntelliMix delivers seamless automatic mixing by combining three separate functions:

Noise Adaptive Threshold. Distinguishes between constant background noise (such as air conditioning) and changing sound (such as speech) for each input channel. It continuously adjusts the activation threshold so that only speech levels louder than the background noise activate a channel.

MaxBus. Controls the number of channels that may be activated for a single sound source. One talker activates only one channel, even if multiple microphones “hear” that talker.

Last Mic Lock-On.Keeps the most recently activated micro- phone open until another microphone is activated. Without Last Mic Lock-On, a long pause in conversation would cause all micro- phones to turn off, which would sound as if the audio signal had been lost. Last Mic Lock-On ensures that background ambience is always present.

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Contents EIGHT-CHANNEL Microphone Mixer Table of Contents System Features DescriptionOperating Principles Front Panel Features Rear Panel FeaturesAC Power Connector and Rocker Switch Connector supplies AC 15 dB DIP SwitchesSW702 = Limiter offSCM810/E Connections Installation and System SetupOutput Limiter Settings Rack Mounting the MixerHigh-Frequency Shelving Equalizer FunctionsBasic Mixer Operation Low Cut Filter High-PassNetworking Multiple Mixers GLOBAL/LOCAL FunctionsLink Cables Replacement Parts SpecificationsLogic Connection Specifications Logic Function Input Connector Pin NoAdvanced Functions Chairperson-Controlled Muting Remote Channel-On IndicatorsSuggested Logic Applications Cough ButtonInhibit Function Filibuster ModeInhibiting Gating for Unwanted Sounds Loudspeaker MutingDigital Controls or Microcomputers Voltage SelectionDiode Isolation of Logic Controls External Logic DevicesInternal Modifications Disable Master Level ControlOff-Attenuation Level Resistor Value SCM810 Speech Gate for Mixing ConsoleIncrease Hold Time