Extron electronics MLS 304MA User Manual page 14

Installation, cont'd
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2- MLS 304 Series, MLS 406 Series • Installation
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.
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.
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.
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.
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.
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.
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.
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.
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 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.
Tip (L)
Ring (R)
Sleeve ( )
3.5 mm Stereo Plug
(unbalanced)
AUX/MIX
ADJUST
-42dB
TO
+24dB
LINE LEVEL
MONO
+ Positive
– Negative
Ground
-10 dBV
sensitivity