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MLC 104 IP Plus Series • Special Applications
133
Volume Control Hardware Setup
1.
Cable these products as shown in the following diagrams, and see the user manual for
each product as needed.
MPA 152 Rear Panel
RS-232
RELAY
V-DC
R
Tx Rx G
G
G
V C
NO
NC
C
POWER
0.3A MAX
12V
CONTROL
OUTPUT
REMOTE
MLA VC10 Plus Rear Panel
POWER
12V
3A MAX
OUTPUT
4/8
OHMS
CLASS 2 WIRING
DO NOT GROUND
OR SHORT
SPEAKER OUTPUTS!
INPUTS
L
R
L
R
REMOTE
VOL/MUTE
10V
50mA
L
MPA 152
R
C
US
LISTED
17TT
AUDIO/VIDEO
APPARATUS
RS-232 12V
MLS PWR
A B
Rx
Tx
GROUND
GROUND
+12V IN
Ground
+12 VDC input
Smooth
Ridged
G
External Power Supply
(12 VDC, 0.5 A max.)
Ground all
Devices
Rx
G
Tx
MLC 104 IP Plus
right side panel
MLS and
Power
ports
NOTE:
You must connect a
ground
wire
between the MLC and MLA.
Heat Shrink
Over Shield
NOTE:
The external power supply
provides power to both the
MLA VC10 Plus and the MLC.
Tie the drain
wire to ground
at both ends.
To
Speakers
From
Audio Source
MPA Remote Port
Pin 1
= 10 VDC reference voltage
Pin 2
= variable control voltage
(0 to 10 V) or mute;
0 V is mute and 10 V
provides max. volume
Pin 3
= GND
Figure 39.
Connecting the MLC to an MLA VC10 Plus Volume Controller and
Connecting the MLA to an MPA Mini Power Amplifier
2.
If necessary, configure the MLA volume controller for the control voltage required by the
amplifier. The MLA VC10 Plus does not require configuration. The MLA-VC10 requires
DIP switches to be set for the appropriate output voltage (see the
MLA‑VC10 User
Guide
for details). The Extron MPA 122, MPA 181T, and MPA 152 accept up to 10 VDC.
Summary of Contents for MLC 104 IP Plus Series
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