Extron electronic MLS 406MA Installation, cont’d,  MLS 304 Series, MLS 406 Series Installation

PRELIMINARY

Installation, cont’d

For these inputs (excluding input 4 on the			Tip (L)
				Ring (R)
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.						Sleeve (			)
N After the audio inputs and outputs are		3.5 mm Stereo Plug
connected, adjust the per-input audio					(unbalanced)
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									AUX/MIX
receiver, for example) with the selected input’s audio,										ADJUST
connect the cable from the mono source to this 3‑pole										-42dB
										TO
captive screw connector. The signal can be balanced							LINE LEVEL			+24dB
or unbalanced. See the diagram at right.								MONO
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	+ Positive
signals from consumer and professional audio
	– Negative

sources. Consumer devices such as PCs, VCRs,	Ground
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.

CThe 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.

NIf audio output is muted via the 1Z SIS command, all audio outputs are muted. You are not able to hear audio from any source.

NIf 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.

NAux/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	-10 dBV
to turn the control adjacent to the Aux/Mix connector.	sensitivity
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.

NThe 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.

NThe 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.

2- MLS 304 Series, MLS 406 Series • Installation