Mixer Linking - Shure AMS8100 User Giude

MIXER LINKING

Linking Multiple AMS8100 Mixers
The AMS8100 provides eight input channels. If additional
inputs are needed, more AMS8100 mixers (as many as 50)
can be "linked" using supplied link cables. A setup like this can
provide up to 400 mic inputs.
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 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
increases slightly as more mixers are linked. This reduces ex-
cessive 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 de-
feat the linking of Aux signals.
IMPORTANT: When using the logic terminals on linked
mixers, connect the Channel 8 LOGIC GROUND terminals of
each unit together. Switching clicks may result if this is not
done.
Linking AMS8100 to Shure SCM810 or FP410
The AMS8100 is fully link--compatible with Shure mixers
utilizing Intellimix, such as the SCM810 or the FP410. When
linked, the last--mic lock--on, MaxBus, and NOMA will work
seamlessly with the other mixers. The direction--sensitive gat-
ing portion of the AMS8100 will function with its microphones,
and the Noise Adaptive Threshold portion of the Intellimix mix-
er will function with the microphones connected to it.
PIN 7
TO
PIN 5
LINK IN
AMS8100 PIN 1
CABLE FOR LINKING AMS8100 MIXER TO AMS8000/AMS400 MIXER
Linking an AMS8100 to AMS8000/AMS4000
To link the AMS8100 with AMS8000 or AMS4000 mixers,
a special cable must be constructed by the installer (see be-
low). Use high quality, 2-conductor, shielded cable. It is impor-
tant to connect the mini-DIN connector to the AMS8100's LINK
IN and the 1/4-in. connectors to the AMS8000 or AMS4000
LINK OUT connector. When linked, the last--mic lock--on and
MaxBus will function on the AMS8100, but not the
AMS8000/AMS4000, as the AMS8000/AMS4000 do not con-
tain circuitry for these functions. The direction--sensitive gat-
ing and the NOMA functions will be unaffected and work be-
tween linked mixers as before.
Room Combining
To connect and disconnect two AMS8100s for room com-
bining purposes, such as may be needed in a partitioned room,
switches or relays must be inserted in series with the link cable
conductors. To accomplish this, all eight conductors within the
link cable must be independently switched, each with a SPST
switch or relay. Alternatively, an 8PST switch or relay may be
used. When the switch is closed, the mixers will be actively
linked. When it is open, the mixers will operate independently.
Extended Link Cables
As the link connections in the AMS8100 are unbalanced,
care must be taken when using longer link cables to avoid hum
and noise problems. High quality, shielded cable should be
used and the cables should be kept away from sources of
magnetic or electrical noise, such as large power transformers
or light dimmers. Additionally, linked mixers should be pow-
ered from the same AC mains circuit to minimize ground cur-
rents. These factors determine the maximum cable length, but
cables under 2 m (6 ft) are generally not a problem.
LINK B
LINK A
GROUND/SHIELD
English -- 14
TIP TO LINK B OUT
SLEEVE
TO
LINK OUT
AMS8000
TIP
SLEEVE
TO LINK A OUT