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DESCRIPTION
The Shure Model SCM410/E is a four-channel automatic micro-
phone mixer for use in sound reinforcement, audio recording, and
broadcast applications. The SCM410 dramatically improves audio
quality in any application where multiple microphones are required.
Any low-impedance dynamic or condenser microphone (including
wireless) can be used with the SCM410. Multiple SCM410 mixers can
be linked to other SCM410 mixers, as well as to Shure Models FP410,
SCM810, SCM800, and AMS8100 mixers.
Each input channel has a two-band equalizer and three logic termi-
nals. The equalizer reduces unwanted low-frequency audio pickup and
makes different microphone types-lavaliers, boundary and handheld-
sound similar. The logic terminals can be used to control external de-
vices.
The SCM410 operates on 100-120 Vac power and the SCM410E
operates on 220-240 Vac power. Each mixer is supplied with a power
cord, rack-mounting hardware, and a link cable.
FEATURES
• Fast, noise-free microphone selection, which automatically
adjusts to changes in background noise
• Automatic gain adjustment as additional microphones are ac-
tivated-NOMA (Number of Open Microphones Attenuated)
• Last Mic Lock-On circuit maintains ambient sound
• Fits in half-rack space
• Adjustable EQ for each channel
• Active balanced microphone-level XLR inputs and an active
balanced Mic/Line level XLR output
• Unbalanced auxiliary-level phono output
• Bi-color channel activation and clipping LEDs
• Peak-responding output limiter with LED indicator
• Peak-responding output level meter
OPERATING PRINCIPLES
The operating concept behind the SCM410 Automatic Mixer is
Shure's patented* IntelliMix
®
circuitry. Intellimix delivers seamless au-
tomatic 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 acti-
vated 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 microphones to turn off, which would sound as if the audio
signal had been lost. Last Mic Lock-On ensures that back-
ground ambience is always present.
*U.S. Patents 4,658,425 and 5,297,210. IntelliMix is a
registered trademark of Shure Incorporated.
FRONT PANEL
Microphone Channel Gain Controls 1 - 4: Allows adjust-
ment of microphone gain.
Input LED 1 - 4: Lights green when channel is active; lights
red at 6 dB below clipping level.
Low-Cut Filter 1 - 4: Provides adjustable low-frequency
rolloff (high pass), reducing presence of undesirable
low-frequency signals.
High-Frequency Shelving Filter 1 - 4: Provides level
boost or cut in mid/high-frequency region for reduced sibi-
lance from vocal microphones, or to compensate for
off-axis coloration in lavalier microphones.
Output Level Meter: Six-segment LED meter indicates
peak output signal level in dBu (0 dBu = 0.775V). The red
LED illuminates when the output is 6 dB below clipping.
The last LED indicates limiter action.
MASTER Level Control: Controls overall output level.
POWER LED: Lights green when mixer is plugged into a
power source.
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