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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
adjusts to changes in background room noise
• Automatic gain adjustment as additional microphones are activat-
ed
• Last Mic Lock-On circuit that maintains ambient sound
• Adjustable low-frequency rolloff and high-frequency shelving for
each channel
• Channel activation and clipping indicators
• Peak-responding output limiter with selectable thresholds and
LED indicator
• Active balanced microphone-level XLR inputs and an active bal-
anced Mic/Line level XLR output
• Aux-level input with manual level control
• Front-panel headphones output with level control
• Linking capability for up to 400 microphones
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.