Extron Electronics MLS 406SA - Manual (Page 14)

Installation, cont’d
MLS 304 Series, MLS 406 Series • Installation 2-
PRELIMINAR
Y
For these inputs (excluding input 4 on the
MLS 406/MLS 406MA/MLS 406SA), connect the
corresponding unbalanced stereo audio signal
to the 3.5 mm mini stereo (tip-ring-sleeve) jack.
Wire the stereo connectors as shown at right.
N After the audio inputs and outputs are
connected, adjust the per-input audio
sensitivity levels and optimize audio input and
output. See pages 3-5 and 3-6 for instructions.
e
Aux/Mix audio input and adjustment — To mix an auxiliary, mono,
line-level audio signal (from a wireless microphone
receiver, for example) with the selected input’s audio,
connect the cable from the mono source to this 3-pole
captive screw connector. The signal can be balanced
or unbalanced. See the diagram at right.
N The Aux/Mix level can be changed ONLY via this rear
panel control. It can not be controlled or adjusted by
RS-232 control, or by a MediaLink Controller.
The Aux/Mix input accepts line level audio
signals from consumer and professional audio
sources. Consumer devices such as PCs, VCRs,
DVD players, and some wireless microphones
typically output an unbalanced -20 dBV to -10 dBV signal. Professional
products such as mixers and signal processing gear typically output a
balanced 0 dBu to +4 dBu level signal.
C The maximum auxiliary input signal level is +4 dBu. Do not exceed this
input level.
This input’s audio channel is always active, and it is independent of the
selectable audio inputs (1-4 or 1-6). The Aux/Mix audio can be heard
throughout a presentation, whether or not another input is selected.
N If audio output is muted via the 1Z SIS command, all audio outputs are
muted. You are not able to hear audio from any source.
N If you mute audio input by selecting input zero (SIS commands 0! or 0$), only
audio from the numbered inputs (1-4 or 1-6) is muted. The Aux/Mix audio
input stays active and is not affected by selection of audio input 0.
N Aux/Mix input can be turned off (muted) via a separate RS-232 command
(0M). See chapter 4,
Serial Communication for details.
To adjust the Aux/Mix input level, use a small screwdriver
to turn the control adjacent to the Aux/Mix connector.
The adjustment range is -42 dB to +24 dB. Setting the
potentiometer to the marked location sets the input level
sensitivity for an approximately -10 dBV consumer signal.
N The Aux/Mix level can be changed ONLY via this rear panel control. It can
not be controlled or adjusted by RS-232 control, or by a MediaLink Controller.
N The optional MediaLink Audio Control Module (ACM-Level, part
#70-182-01, -02, -03) is not compatible with these switchers. The mix level
control is not supported.
Sleeve ( )
Ring (R)
Tip (L)
3.5 mm Stereo Plug
(unbalanced)
-10 dBV
sensitivity
LINE LEVEL
MONO
AUX/MIX
ADJUST
-42dB
TO
+24dB
+ Positive
– Negative
Ground