IMPORTANT:
Go to www.extron.com for the
complete user guide, installation
instructions, and specifications.
MVC 121 Plus • Setup Guide
The Extron MVC 121 Plus is an audio mixer and volume controller that will mix up to two mono mic/line inputs (balanced/
unbalanced) with one stereo line level input (balanced/unbalanced). All audio input signals are converted from analog to digital
prior to processing or routing. Each mic/line input and the line level input have their own gain control adjustment screws. The
mixed variable output also features a volume control knob on the front panel.
NOTE: For full installation, configuration, and operation details, see the MVC 121 Plus User Guide, available at
www.extron.com.
Rear Panel Features and Connections
a
12 VDC power connector
f
Fixed output connector
b
Mic 1 and 2 Phantom power LED
g
RS-232 connector
c
Mic/Line input connectors (1 – 2)
h
Digital input connector
d
Line input connector (3)
i
Reset button
e
Variable output connector
Installing the MVC 121 Plus
1. Disconnect power from all equipment.
2. (Optional) Mount the unit to a rack or furniture.
3. Connect the audio inputs.
• Connect up to two balanced or unbalanced mono mic/line level input devices to
connector c above (see the 6-pole wiring diagram on the right). Alternatively,
two 3-pole connectors may be used.
• A balanced or unbalanced stereo line level input may be connected to d above (see the 5-pole wiring diagram below).
Tip
Ring
Tip
Ring
ves
Unbalanced audio
Tip
Sleeve
Sleeve
Tip
Do not tin the wires!
4. Connect the audio output.
• For variable balanced or unbalanced stereo output controlled
by the front panel knob of the MVC 121 Plus, connect an
amplier to the Variable connector
e
, above (see the wiring
diagram on the right).
• For xed stereo output, connect an output device to Fixed
connector
f
(see the wiring diagram above).
5. Connect a control device. Connect a host device, such as a computer, to
one of the following MVC ports to congure and control the MVC 121 plus via
Simple Instruction Set (SIS™) commands.
• RS-232 port (rear panel) — Connect a host device to the Tx, Rx, and
_ (ground) pins of this 6-pole captive screw connector (
g
). The default
baud rate for this port is 38400 baud, 1 stop bit, no parity, 8 data bits, and
no ow control (see the wiring diagram on the right).
• Config port (front panel) — See Front Panel Features on the next page.
6. Digital input connector. Up to three congurable input ports (see
h
on the
rear panel diagram above) allow connection to various devices including motion
detectors, alarms, buttons, photo (light) sensors, and temperature sensors. This
connector shares a common ground with the RS-232 connector (see the wiring
diagram on the right).
Both the RS-232 and digital input connectors may be used simultaneously by
using a 6-pin captive screw connector with two wires sharing the ground connector
(see the diagram on the right).
12MIC/LINE
Unbalanced MI
Jumper
Unbalanced Stereo Output
Tip
NO GROUND HERE.
ve(s)
Tip
NO GROUND HERE.
Balanced Stereo Output
Tip
Ring
Sleeve(s)
Tip
Ring
LR
LR
Left
Right
Left
Do not tin the wires!
Transmit (Tx)
Receive (Rx)
)
RS-232
DIGI IN
Do not tin the wires!
1
2
3
_
RS-232
21
Tx
Rx
DIGI IN
3
2
1
+48V
MIC
12MIC/LINE
LINE 3
L
R
RL
POWER
0.4A MAX
12V
RS-232
VARIABLE
FIXEDLR
DIGI IN
MVC 121 Plus
Tx Rx 1 2 3
INPUTS OUTPUTS
RESET
1
2
3
4 5
6
7
9
8
RS-232
DIGI IN
Tx Rx 1 2 3
