Networking Multiple Mixers; Global/Local Functions; Link Cables - Shure SCM810 User Manual

If additional inputs are needed, more SCM810 mixers (as many
as 50) can be "linked" using supplied link cables. Such a configu-
ration can provide up to 400 microphone inputs.
To link multipel mixers, connect the LINK OUT of the first mixer to
the LINK IN of the next mixer, and so on (see Figure 6). Leave the
LINK IN jack of the first mixer and the LINK OUT jack of the last
mixer unconnected.
LINKING MIXERS
FIGURE 6

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 controls the level of
its own output.
The Master level control is independent of the Global/Local
switch. The output level of each mixer is affected only by its own
Master control. All automatic functions (such as Last Mic Lock-
on and MaxBus) are connected on all linked mixers and are not
affected by the Global/Local switch.
An example of the possibilities of this setup is shown in Figure 8.
Here two SCM810s are set to Local, and the resulting sound dis-
tribution provides local sound reinforcement while avoiding feed-
back. This is a simple "mix-minus" setup. The third SCM810 is
set to Global and feeds a tape recorder, At the same time, the au-
tomatic functions (Last Mic Lock-On, etc.) remain common to all
mixers. The following table summarizes the mixer settings.
Mixer Link Global/
Local Switch
A
B
C

LINK CABLES

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

NETWORKING MULTIPLE MIXERS

Audio Output
Contains...
Local A
Local B
Global A, B, C
As long as the link jacks of all mixers are connected (out-to-in,
sequentially, leaving one Link In and one Link Out jack uncon-
nected), the automatic mixing 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 in-
creases 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 mixer'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 result if this is not done.
SCM810 "C" (GLOBAL)
LINK SCM810 "A" (LOCAL)
SCM810 "B" (LOCAL)
LOUDSPEAKER
LINKED SMC810 MIXERS
connections; they are variously referred to by Apple as "shielded
serial cable with two mini DIN-8 connectors," and "Apple System
Peripheral–8 Cable."
8
RECORDER
LOUDSPEAKER
FIGURE 8