Description, Features, Operating Principles

DESCRIPTION

The Shure Model SCM410/E is a four-channel automatic microphone	Each input channel has a two-band equalizer and three logic termi-
mixer for use in sound reinforcement, audio recording, and broadcast	nals. The equalizer reduces unwanted low-frequency audio pickup and
applications. The SCM410 dramatically improves audio quality in any	makes different microphone types-lavaliers, boundary and handheld-
application where multiple microphones are required. Any low-imped-	sound similar. The logic terminals can be used to control external de-
ance dynamic or condenser microphone (including wireless) can be	vices.
used with the SCM410. Multiple SCM410 mixers can be linked to other	The SCM410 operates on 100-120 Vac power and the SCM410E op-
SCM410 mixers, as well as to Shure Models FP410, SCM810, and	erates on 220-240 Vac power. Each mixer is supplied with a power
SCM800.	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 activated- 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 back- ground 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.

FRONT PANEL

•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 microphone 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 background ambience is always present.

*U.S. Patents 4,658,425 and 5,297,210. IntelliMix is a registered trademark of Shure Incorporated.

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2	3	4	5	6	7

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 sibilance 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 illu- minates 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.

SCM410E, SCM410 specifications

The Shure SCM410 and SCM410E are state-of-the-art automatic microphone mixers designed to enhance audio performance in various professional environments. Known for their reliability and advanced features, these mixers are a popular choice for broadcasters, conferencing systems, and live event productions.

One of the key features of the SCM410 is its Automatic Gain Control (AGC) system, which intelligently adjusts the gain of connected microphones based on their audio levels. This ensures that the output remains consistent, making it ideal for situations where multiple speakers might share the microphone, such as panel discussions or meetings. The SCM410E variant further enhances this functionality with extended connectivity options, catering to more complex audio setups.

Both models incorporate Shure's exclusive IntelliMix technology. IntelliMix employs sophisticated algorithms to minimize interference and eliminate feedback, which is crucial for maintaining intelligibility in crowded sound environments. The mixers automatically manage the microphone levels, activating only those that are in use while suppressing those that are not, which not only enhances audio clarity but also helps in reducing background noise.

The SCM410 features four microphone inputs, allowing operators to connect multiple microphones simultaneously. Users can easily control each input's level, with individual gain adjustments and a master output level control. Additionally, LEDs provide visual feedback on the status of each microphone, indicating when they are active or inactive. The SCM410E goes a step further, offering additional mic input options and enhanced flexibility for integration into larger systems.

Durability is a hallmark of the SCM410 and SCM410E, as they are constructed with high-quality materials, designed to withstand the rigors of professional use. The intuitive interface makes them accessible for both novice users and seasoned sound engineers.

With a phantom power switch for condenser microphones, an easy-to-read, backlit display, and robust connectivity options, the SCM410 and SCM410E are versatile tools for any audio setup. Their ability to automatically mix and control audio levels in real-time ensures that users can deliver presentations, discussions, and performances with clarity and confidence. Whether it’s in a corporate boardroom or a live concert venue, these automatic microphone mixers deliver high-quality sound tailored to the needs of modern audio applications.