Specifications

linked mlxers, connect the Channel 8 Logic Ground ter-
minals of each unit together.
Switching clicks may
result if
thts is not done.
When mixers are linked, the combined signals of all the
mlcrophones appear at the outputs [MicILine, Aux, and
Phones] of ALL the linked mixers. Thus, you can take
outputs from several mixers for a multiple feed.
However, an aux source connected to an AMS mixer is
heard at the outputs of that mixer only, NOT at the
outputs of linked mixers. For this reason, plug the aux
source into the mixer providing the audio output. If
multiple feeds are being used from linked mixers and it
is desired that the aux source appear in all, parallel the
aux source [using Y-adapter cables] to the Aux inputs
of all the mixers used for the multiple feeds.
The Master Gain control on each linked mixer controls
the
overail level at its own outputs of all the linked
mlcrophones and of its own Aux inputs. The Off-
Attenuation controls and the Normal and Overload
LED'S operate in the same way-they control and show
the status of the outputs from the mixer on which they
appear. The Hold
Tlme switch on each mixer affects
only the microphones connected to that mixer.
TO AMPL,
TAPE REC, ETC
LINKING MIXERS
FIGURE
4
MICROPHONE PLACEMENT
Use Low-Profile AMS22 Microphones on tables and desks;
use permanently mounted Gooseneck
AMS24 Microphones
on tables, desks or lecterns; use Probe
AMS26
Microphones on floor or desk stands or goosenecks; use
Lavalier
AMS28 Microphones where the talker must have
freedom of movement.
Locate the microphones so that intended sources are within
60° of either side of the front of the microphone; that is,
within the
1 20° acceptance angle [see Figure 51. Sources of
undesired sound should be located outside the
1 20° accep-
tance angle.
Use as few microphones as necessary to pick up everyone.
The closer the microphones are to their sound sources, the
greater the loudness of the sound system before feedback
occurs. Each microphone should be at least
1 meter [3 ft]
from the wall behind it, and at least 0.3 meters
[I ft] from
objects behind it, such as large ashtrays or briefcases.
When using
AMS28 Microphones, avoid acoustic feedback
from loudspeakers near the microphones.
MICROPHONE ACCEPTANCE ANGLE
FIGURE
5
TYPICAL APPLICATIONS
Conference Room
Refer to the AMS Operators Manual for microphone place-
ment at conference tables. Connect extension cables to the
microphones and to the microphone input connectors on the
rear panel of the mixer. Connect the
LineIMic Output to the
line input of the PA amplifier. To record the meeting, con-
nect the Aux Output to the aux
Input of a tape recorder.
Church
Connect extension cables to the microphones and to the
microphone input connectors on the rear panel of the mixer.
Connect the
LineIMic Output to the line input of the PA
amplifter. To record the service, connect the Aux Output to
the aux input of a tape recorder [see
Flgure 61.
Note that the cholrs are inslde the acceptance angles of the
pulpit and lectern microphones. Thus, some choir members
may gate on the pulpit and lectern
mlcrophones occasionally.
This will not seriously degrade the performance of the
system.
Courtroom
Connect equipment as described for the church setup. Also
connect each Direct Output to a separate microphone input
channel of a multitrack tape recorder for easy
identification
of talkers during transcription. The Aux Output containing a
mix of all the microphones connects to another channel of
the
mult~track recorder. Th~s channel can be monitored to
hear the entire
proceedings. [See Figure 71.
Often a tape playback 1s used for evidence or for transcript
ver~f~cation. Connect the tape player's aux output to the Aux
lnput of the mixer.
Legislature
A typical legislature setup is shown in Figure 8.
[Chairperson-Controlled Muting-see LOGIC FUNC-
TIONS-is also shown.] Two or more mixers are linked via
the
L~nk A and Link B jacks. The Channel 8 Logic Ground ter-