MLC Plus 50/100/200 Series • Hardware Features and Installation 21
D
Volume control port — To provide volume control for some Extron audio amplifiers,
connect this port to the volume remote control port on the amplifier as shown below.
Configure the maximum and minimum voltage limits. Set Soft Start mode off or on
(default). Soft Start mode allows volume to gradually increase from mute to the previous
level after muting or power-on to prevent loud audio bursts.
GCV
10V 50mA
GCV
REMOTE
10V 50mA
GCV
10V
REMOTE
VOL/MUTE
REMOTE
VOL/MUTE
10V 50mA
G
STANDBY
10V 50mA
GCV
GCV
VOL
IR
I
GCV
VOL
Ground (Gnd)
Reference voltage input (from amplier) – This allows the MLC Plus to detect when the amp is present.
C
G
Control voltage (variable output to amp from MLC Plus) – This signal controls the amp volume.
V
Ground
C
G
Control voltage
C Plus
Panel
Control voltage output:
0 - 10 VDC
Reference
voltage: ≤10 VDC
NOTE:
Use shielded cable
and place the MLC Plus as
close as possible to the
amplier to avoid picking up
background noise via the
cable.
NOTE: When audio
mute is active, the
MLC Plus sets
control voltage output
to
0 VDC, even if the
voltage range
(minimum and
maximum voltage
limits) have been set
to levels above zero,
such as 2 V to 8 V.
Volume Control
This port can be used to control the volume and mute or unmute the audio for some
Extron audio ampliers with remote volume capability.
• Connect to an Extron audio ampier to
permit volume control via the
MLC
Plus.
• Do not exceed 25 VDC input voltage.
Settings to configure via software:
• Maximum and minimum voltage
limits
• Soft Start mode: off or on (default) − to allow
volume to gradually increase from mute to
the previous level after muting or power-on
to prevent loud audio bursts
Example:
Connecting to
Extron Amplifiers
MLC Plus
Rear Panel
C or
VOL/MUTE
V or 10V G or
MPA 401 Series
MPA 181T,
MP 101 Series
MPA 152MPA 152 PlusXPA 1002
Figure 19. Volume Control Port Wiring Examples
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