Networking Multiple Mixers, GLOBAL/LOCAL Functions

NETWORKING MULTIPLE MIXERS

If additional inputs are needed, more SCM810 mixers (as many as 50) can be “linked” using supplied link cables. Such a configuration can provide up to 400 microphone inputs.

To link multiple mixers, connect the LINK OUT of the first mixer to the LINK IN of the next mixer, and so on (see Figure 8). Leave the LINK IN jack of the first mixer and the LINK OUT jack of the last mixer unconnected.

LINKING MIXERS

FIGURE 8

As long as the link jacks of all mixers are connected (out-to-in, sequentially, leaving one Link In and one Link Out jack unconnected), the automatic mix- ing functions will be shared by all units. All input signals appear at all linked mixer outputs. There is no master/slave relationship.

The output controls and functions of each linked mixer are post-link and do not affect the signals appearing at other linked mixer outputs. Each mixer's Master level control only controls its own output. Each output can be used independently.

NOTE: The actual off-attenuation in the 15 dB switch position increases as more mixers are linked. This reduces excessive noise and reverberation contributed by the increased number of attenuated microphones.

In a linked system, the Aux input of any mixer appears at each linked mix- er's output. See Internal Modifications to defeat the linking of Aux signals.

IMPORTANT: When using the logic terminals on linked mixers, connect the LOGIC GROUND terminals of each unit together. Switching clicks may re- sult if this is not done.

GLOBAL/LOCAL FUNCTIONS
The Global/Local switch selects which input channels appear at that linked
mixer's output. Set to the Global position, all input channels appear at that
mixer's output. Set to the Local position, only its own eight input channels
appear at that mixer's output. The Master level control, in any mode, only		SCM810 “C” (GLOBAL)	RECORDER
controls the level of its own output.		SCM810 “C” (GLOBAL)	RECORDER
The Master level control is independent of the Global/Local switch. The out-
put level of each mixer is affected only by its own Master control. All auto-	LINK	SCM810 “A” (LOCAL)
matic functions (such as Last Mic Lock-on and MaxBus) are connected on
all linked mixers and are not affected by the Global/Local switch.		SCM810 “B” (LOCAL)
An example of the possibilities of this setup is shown in Figure 9 Here two		SCM810 “B” (LOCAL)

SCM810s are set to Local, and the resulting sound distribution provides
local sound reinforcement while avoiding feedback. This is a simple
“mix-minus” setup. The third SCM810 is set to Global and feeds a tape
recorder, At the same time, the automatic functions (Last Mic Lock-On,
etc.) remain common to all mixers. The following table summarizes the
mixer settings.

MIXER	Link Global/	Audio Output
	Local Switch	Contains...	LOUDSPEAKER	LOUDSPEAKER
A	Local	A
B	Local	B
C	Global	A, B, C

LINKED SCM810 MIXERS

FIGURE 9

LINK CABLES

Additional link cables are available as Shure Part No. 95A1143 (305 mm- 12 in.). Longer cables in a variety of lengths are available from Apple Com- puter as computer printer

connections; they are variously referred to by Apple as “shielded serial cable with two mini DIN-8 connectors,” and “Apple System Peripheral-8 Cable.”

SCM810 specifications

The Shure SCM810 is a state-of-the-art automatic mixer designed for audio professionals seeking precision and reliability in various environments such as live events, broadcasting, and recording studios. This mixer is an integral part of speech reinforcement and meeting applications, providing seamless integration of multiple microphones while ensuring clarity and minimizing feedback.

One of the defining features of the SCM810 is its automatic mixing technology. It employs an advanced algorithm that intelligently manages microphone levels. Instead of manually adjusting levels for each microphone, the SCM810 automatically reduces the gain of inactive mics while boosting those in use. This results in improved sound quality and prevents unwanted noise interference, allowing for a professional audio experience.

The SCM810 supports up to eight microphones, making it versatile enough for panel discussions, roundtable meetings, or larger conferences. In addition to its mixing capabilities, the device boasts a unique "automatic gain control" system that maintains consistent audio levels regardless of the number of active microphones. This ensures that the audience receives a balanced sound across the room without sudden volume fluctuations.

Another notable characteristic of the SCM810 is its low noise operation. The mixer features high-quality preamps that reduce self-noise, providing clear audio reproduction. This is particularly important in environments where clarity is paramount, such as in broadcast applications. The device also includes individual channel gain controls, allowing audio engineers to fine-tune levels to suit specific needs.

In terms of connectivity, the SCM810 features balanced XLR inputs and outputs, ensuring compatibility with a wide range of professional audio equipment. Additionally, it is equipped with a built-in signal processing capability, including a 3-band EQ per channel, which allows for further customization of the audio signal.

Robust and reliable, the Shure SCM810 is built with durability in mind, making it suitable for both permanent installations and portable setups. Its intuitive front-panel controls simplify operation, ensuring that even less experienced users can achieve high-quality audio without extensive training.

In summary, the Shure SCM810 automatic mixer stands out in a crowded market with its advanced automatic mixing algorithms, low noise operation, versatile connectivity, and durable construction. It's an essential tool for anyone requiring dependable, high-fidelity audio control in diverse applications, helping to elevate the audio experience to a professional standard.