Extron Electronics MVC 121 User Manual

User’s Guide

MVC 121

Mic/Line Mixer and Volume Controller

68-793-01 Rev. C

02 09

Precautions

Safety Instructions • English

This symbol is intended to alert the user of
important operating and maintenance (servicing)
instructions in the literature provided with the
equipment.

This symbol is intended to alert the user of the
presence of uninsulated dangerous voltage within
the product's enclosure that may present a risk of
electric shock.

Caution

Read Instructions • Read and understand all safety and operating instructions

before using the equipment.

Retain Instructions • The safety instructions should be kept for future

reference.

Follow Warnings • Follow all warnings and instructions marked on the

equipment or in the user information.

Avoid Attachments • Do not use tools or attachments that are not

recommended by the equipment manufacturer because they may be
hazardous.

Consignes de Sécurité • Français

Ce symbole sert à avertir l’utilisateur que la
documentation fournie avec le matériel contient
des instructions importantes concernant
l’exploitation et la maintenance (réparation).

Ce symbole sert à avertir l’utilisateur de la présence
dans le boîtier de l’appareil de tensions
dangereuses non isolées posant des risques
d’électrocution.

Attention

Lire les instructions• Prendre connaissance de toutes les consignes de sécurité et

d’exploitation avant d’utiliser le matériel.

Conserver les instructions• Ranger les consignes de sécurité afin de pouvoir les

consulter à l’avenir.

Respecter les avertissements • Observer tous les avertissements et consignes

marqués sur le matériel ou présentés dans la documentation utilisateur.

Eviter les pièces de fixation • Ne pas utiliser de pièces de fixation ni d’outils

non recommandés par le fabricant du matériel car cela risquerait de poser
certains dangers.

Sicherheitsanleitungen • Deutsch

Dieses Symbol soll dem Benutzer in der im
Lieferumfang enthaltenen Dokumentation
besonders wichtige Hinweise zur Bedienung und
Wartung (Instandhaltung) geben.

Dieses Symbol soll den Benutzer darauf
aufmerksam machen, daß im Inneren des
Gehäuses dieses Produktes gefährliche
Spannungen, die nicht isoliert sind und die einen
elektrischen Schock verursachen können,
herrschen.

Achtung

Lesen der Anleitungen • Bevor Sie das Gerät zum ersten Mal verwenden,

sollten Sie alle Sicherheits-und Bedienungsanleitungen genau durchlesen und
verstehen.

Aufbewahren der Anleitungen • Die Hinweise zur elektrischen Sicherheit des

Produktes sollten Sie aufbewahren, damit Sie im Bedarfsfall darauf
zurückgreifen können.

Befolgen der Warnhinweise • Befolgen Sie alle Warnhinweise und Anleitungen

auf dem Gerät oder in der Benutzerdokumentation.

Keine Zusatzgeräte • Verwenden Sie keine Werkzeuge oder Zusatzgeräte, die

nicht ausdrücklich vom Hersteller empfohlen wurden, da diese eine
Gefahrenquelle darstellen können.

Instrucciones de seguridad • Español

Este símbolo se utiliza para advertir al usuario
sobre instrucciones importantes de operación y
mantenimiento (o cambio de partes) que se desean
destacar en el contenido de la documentación
suministrada con los equipos.

Este símbolo se utiliza para advertir al usuario
sobre la presencia de elementos con voltaje
peligroso sin protección aislante, que puedan
encontrarse dentro de la caja o alojamiento del
producto, y que puedan representar riesgo de
electrocución.

Precaucion

Leer las instrucciones • Leer y analizar todas las instrucciones de operación y

seguridad, antes de usar el equipo.

Conservar las instrucciones • Conservar las instrucciones de seguridad para

futura consulta.

Obedecer las advertencias • Todas las advertencias e instrucciones marcadas

en el equipo o en la documentación del usuario, deben ser obedecidas.

Evitar el uso de accesorios • No usar herramientas o accesorios que no sean

especificamente recomendados por el fabricante, ya que podrian implicar
riesgos.

Warning

Power sources • This equipment should be operated only from the power source

indicated on the product. This equipment is intended to be used with a main
power system with a grounded (neutral) conductor. The third (grounding) pin is
a safety feature, do not attempt to bypass or disable it.

Power disconnection • To remove power from the equipment safely, remove all

power cords from the rear of the equipment, or the desktop power module (if
detachable), or from the power source receptacle (wall plug).

Power cord protection • Power cords should be routed so that they are not likely to

be stepped on or pinched by items placed upon or against them.

Servicing • Refer all servicing to qualified service personnel. There are no user-

serviceable parts inside. To prevent the risk of shock, do not attempt to service
this equipment yourself because opening or removing covers may expose you to
dangerous voltage or other hazards.

Slots and openings • If the equipment has slots or holes in the enclosure, these are

provided to prevent overheating of sensitive components inside. These openings
must never be blocked by other objects.

Lithium battery • There is a danger of explosion if battery is incorrectly replaced.

Replace it only with the same or equivalent type recommended by the
manufacturer. Dispose of used batteries according to the manufacturer's
instructions.

Avertissement

Alimentations• Ne faire fonctionner ce matériel qu’avec la source d’alimentation indiquée

sur l’appareil. Ce matériel doit être utilisé avec une alimentation principale comportant
un fil de terre (neutre). Le troisième contact (de mise à la terre) constitue un dispositif de
sécurité : n’essayez pas de la contourner ni de la désactiver.

Déconnexion de l’alimentation• Pour mettre le matériel hors tension sans danger,

déconnectez tous les cordons d’alimentation de l’arrière de l’appareil ou du
module d’alimentation de bureau (s’il est amovible) ou encore de la prise secteur.

Protection du cordon d’alimentation • Acheminer les cordons d’alimentation de

manière à ce que personne ne risque de marcher dessus et à ce qu’ils ne soient
pas écrasés ou pincés par des objets.

Réparation-maintenance • Faire exécuter toutes les interventions de réparation-

maintenance par un technicien qualifié. Aucun des éléments internes ne peut être
réparé par l’utilisateur. Afin d’éviter tout danger d’électrocution, l’utilisateur ne
doit pas essayer de procéder lui-même à ces opérations car l’ouverture ou le
retrait des couvercles risquent de l’exposer à de hautes tensions et autres dangers.

Fentes et orifices • Si le boîtier de l’appareil comporte des fentes ou des orifices,

ceux-ci servent à empêcher les composants internes sensibles de surchauffer. Ces
ouvertures ne doivent jamais être bloquées par des objets.

Lithium Batterie • Il a danger d'explosion s'll y a remplacment incorrect de la

batterie. Remplacer uniquement avec une batterie du meme type ou d'un ype
equivalent recommande par le constructeur. Mettre au reut les batteries usagees
conformement aux instructions du fabricant.

Vorsicht

Stromquellen • Dieses Gerät sollte nur über die auf dem Produkt angegebene

Stromquelle betrieben werden. Dieses Gerät wurde für eine Verwendung mit
einer Hauptstromleitung mit einem geerdeten (neutralen) Leiter konzipiert. Der
dritte Kontakt ist für einen Erdanschluß, und stellt eine Sicherheitsfunktion dar.
Diese sollte nicht umgangen oder außer Betrieb gesetzt werden.

Stromunterbrechung • Um das Gerät auf sichere Weise vom Netz zu trennen,

sollten Sie alle Netzkabel aus der Rückseite des Gerätes, aus der externen
Stomversorgung (falls dies möglich ist) oder aus der Wandsteckdose ziehen.

Schutz des Netzkabels • Netzkabel sollten stets so verlegt werden, daß sie nicht

im Weg liegen und niemand darauf treten kann oder Objekte darauf- oder
unmittelbar dagegengestellt werden können.

Wartung • Alle Wartungsmaßnahmen sollten nur von qualifiziertem

Servicepersonal durchgeführt werden. Die internen Komponenten des Gerätes
sind wartungsfrei. Zur Vermeidung eines elektrischen Schocks versuchen Sie in
keinem Fall, dieses Gerät selbst öffnen, da beim Entfernen der Abdeckungen die
Gefahr eines elektrischen Schlags und/oder andere Gefahren bestehen.

Schlitze und Öffnungen • Wenn das Gerät Schlitze oder Löcher im Gehäuse

aufweist, dienen diese zur Vermeidung einer Überhitzung der empfindlichen
Teile im Inneren. Diese Öffnungen dürfen niemals von anderen Objekten
blockiert werden.

Litium-Batterie • Explosionsgefahr, falls die Batterie nicht richtig ersetzt wird.

Ersetzen Sie verbrauchte Batterien nur durch den gleichen oder einen
vergleichbaren Batterietyp, der auch vom Hersteller empfohlen wird. Entsorgen
Sie verbrauchte Batterien bitte gemäß den Herstelleranweisungen.

Advertencia

Alimentación eléctrica • Este equipo debe conectarse únicamente a la fuente/tipo de

alimentación eléctrica indicada en el mismo. La alimentación eléctrica de este equipo debe
provenir de un sistema de distribución general con conductor neutro a tierra. La tercera
pata (puesta a tierra) es una medida de seguridad, no puentearia ni eliminaria.

Desconexión de alimentación eléctrica • Para desconectar con seguridad la acometida

de alimentación eléctrica al equipo, desenchufar todos los cables de alimentación en el
panel trasero del equipo, o desenchufar el módulo de alimentación (si fuera
independiente), o desenchufar el cable del receptáculo de la pared.

Protección del cables de alimentación • Los cables de alimentación eléctrica se deben

instalar en lugares donde no sean pisados ni apretados por objetos que se puedan
apoyar sobre ellos.

Reparaciones/mantenimiento • Solicitar siempre los servicios técnicos de personal

calificado. En el interior no hay partes a las que el usuario deba acceder. Para
evitar riesgo de electrocución, no intentar personalmente la reparación/
mantenimiento de este equipo, ya que al abrir o extraer las tapas puede quedar
expuesto a voltajes peligrosos u otros riesgos.

Ranuras y aberturas • Si el equipo posee ranuras o orificios en su caja/alojamiento,

es para evitar el sobrecalientamiento de componentes internos sensibles. Estas
aberturas nunca se deben obstruir con otros objetos.

Batería de litio • Existe riesgo de explosión si esta batería se coloca en la posición

incorrecta. Cambiar esta batería únicamente con el mismo tipo (o su equivalente)
recomendado por el fabricante. Desachar las baterías usadas siguiendo las
instrucciones del fabricante.

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FCC Class A Notice

This equipment has been tested and found to comply with the limits for a
Class A digital device, pursuant to part 15 of the FCC Rules. These limits are
designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates,
uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to
cause harmful interference, in which case the user will be required to correct the
interference at his own expense.

N This unit was tested with shielded cables on the peripheral devices. Shielded

cables must be used with the unit to ensure compliance.

i

Quick Start Guide — MVC 121

Step 1

Disconnect all power prior to installing the MVC 121.

Step 2

Mount the MVC (if applicable) or affix the rubber feet to the bottom
of the MVC for tabletop use. The MVC can be mounted in a rack
shelf, under furniture, or to a projector mount. See chapter 2,
“Installation and Operation”, for details.

D
I

S
T

R
I

B
U

T
I

O
N

A

M
P

L
I

F
I

E
R

VersaTools Rack Shelf

1/4 Rack Width
False Front Face Plate

Use 2 mounting holes
on opposite corners

Rack shelf mounting

D
I
S

T
R

I
B

U
T

I
O

N

A
M

P
L

I
F

I
E

R

VOL

M

I
C

1

M

I
C

2

M

A

I
N

3

M

A

S

T
E

R

M

I
X

E
R

/
V

O
L

U
M

E

C

O
N

T
R

O
L

L
E

R

(2) 4-40 x 3/16" screws

PMK 100

Mounting
Bolt

0.5A MAX
12V

POWER

CONTROLLER

MIXER/VOLUME

MVC 121

MIC

LINE

1

1

2

ON

2

1

3

2

L

E
V

4

E
L

INPUTS

OFF

4
8

ON

V

MIC 1

L

MAIN 3

MIC 2

R

L

VARIABLE

L

FIXED

R

TxRx

R

O
U
T

RS-232

P

U
T

S

1

2

MUTE

3

Projector

To a projector mount

VOL

M

I
C

1

M

I
C

2

M

A

I

N

3

M

A

S

T
E

R

M

IX

E

R

/
V

O

L
U

M

E

C

O

N

T
R

O

L
L

E

R

Under furniture

MVC 121 • Quick Start Guide

QS-1

Quick Start Guide — MVC 121, cont’d

Step 3

Attach the cables and set the DIP switches.

4 6

MVC 121

MIXER/VOLUME
CONTROLLER

POWER

12V

0.5A MAX

LINE

INPUTS

48V

LEVEL

ON

MIC

1

4

2

3

1

1

2

2

MAIN 3

L

ON

OFF

MIC 1

MIC 2

FIXED

R

L

L

VARIABLE

R

OUTPUTS

RS-232

Tx Rx

MUTE

2

1

R

7 81 2 3 5

Power connector — Connect the 12 VDC external power

1

supply.

CAUTION

When connecting the power supply, voltage
polarity is extremely important. Applying power
with incorrect voltage polarity could damage the
power supply and the MVC 121.

2

Mic input DIP switch — Mic 1 and Mic 2 inputs are controlled
via the DIP switch.

1. Set the mic input Level according to the mic type:

a. Wireless mic: Set the mic’s DIP switch to Line (On).

b. Wired mic: Set the mic’s DIP switch to Mic (Off).

2. Set the 48V phantom power according to the mic type:

3

a. Condenser mic: Set the mic’s DIP switch to On.

b. Dynamic mic: Set the mic’s DIP switch to Off.

CAUTION

Never set a dynamic microphone to 48V, doing so
may damage the microphone. For condenser mics,
verify that the mic will safely operate at 48VDC.

When the DIP switch is set to line level, 48V phantom
power is disabled regardless of its DIP switch position.

Mic 1 and Mic 2 input connector — Up to two mono

3

microphones, balanced and/or unbalanced, may be connected.
Main 3 line level input connector — Connect a line level audio

4

source.

MVC 121 • Quick Start GuideQS-2

Variable output connector — The balanced/unbalanced stereo

5

output is controlled by the Master volume control knob on the
front panel.

Fixed output connector — The balanced/unbalanced stereo

6

output is set at a fixed level for input to a recording device.
Signal level can be adjusted at the recording device.

RS-232 connector — Connect an RS-232 device (control system

7

or PC) for two-way RS-232 communication.
Mute connector — Connect a contact closure device to mute

8

the inputs. See “Contact Closure Mute” in chapter 3.

Step 4

Adjust the front panel volume controls. See chapter 2, “Installation
and Operation”.

VOL

MIC 1

1

MIC 2 MAIN 3 MASTER

MIXER/VOLUME CONTROLLER

1

2

Volume level LEDs — Mic 1, Mic 2, Main 3, and Master gain/

1

3

4

MVC 121

5

volume level indicators.

Mic 1 input gain control and on/off indication LED

2

Mic 2 input gain control and on/off indication LED

3

Main 3 line level input gain control and on/off indication LED

4

Master output volume control and on/off indication LED to

5

control variable output

MVC 121 • Quick Start Guide

QS-3

Quick Start Guide — MVC 121, cont’d

MVC 121 • Quick Start GuideQS-4

Table of Contents

Chapter 1 • Introduction .......................................................... 1-1

About the MVC 121 ............................................................... 1-2

Features ...................................................................................... 1-2

Chapter 2 • Installation and Operation.......................... 2-1

Mounting the MVC 121 .......................................................2-2

Tabletop use ...........................................................................2-2

UL rack mounting guidelines .................................................2-2

Rack mounting ....................................................................... 2-3

Furniture or projector mounting ...........................................2-4

Furniture mounting ..........................................................2-4

Projector mounting .......................................................... 2-5

Application Diagram ...........................................................2-6

Rear Panel Features and Cabling ..................................2-7

Front Panel Features .......................................................... 2-12

Turning channels on/off .......................................................2-13

On/off status LEDs ...............................................................2-14

Mute/unmute channel ......................................................... 2-14

Front panel security lockout (executive mode) .................. 2-14

Chapter 3 • Remote Control ...................................................3-1

RS-232 Programmer’s Guide ............................................ 3-2

Host-to-MVC communications ...............................................3-2

MVC-initiated messages ........................................................3-2

Error responses ......................................................................3-2

Using the command/response table ..................................... 3-3

Command/response table ..................................................... 3-5

Windows-based Program Control .................................. 3-9

Installing the software .......................................................... 3-9

Using the software .............................................................. 3-10

Setting output volume range limits

Using the help system .........................................................3-12

Updating the firmware .......................................................3-12

Contact Closure Mute ........................................................ 3-13

................................ 3-10

Appendix A • Specifications, Part Numbers, and

Accessories........................................................................................ A-1

Specifications ......................................................................... A-2

Included Parts ......................................................................... A-5

Optional Accessories .......................................................... A-5

MVC 121 • Table of Contents

TOC-i

Table of Contents, cont’d

All trademarks mentioned in this manual are the properties of their respective owners.

TOC-ii

68-793-01 Rev. C

02 09

MVC 121 • Table of Contents

MVC 121 Mic/Line Mixer

Chapter One

1

Introduction

About the MVC 121

Features

Introduction

About the MVC 121

The Extron MVC 121 is an audio mixer and volume controller in
the Extron VersaTools
inputs (mono, balanced/unbalanced) with one main line level
input (stereo, balanced/unbalanced). Each mic input and the
main line level input have their own gain control knobs, and the
mixed output also features a volume control knob.

Volume adjustment interval varies with the speed of knob
rotation, i.e., turning the knob slowly increments the volume in
smaller steps (0.5 dB), and turning the knob quickly increments
the volume in larger steps (2.5 dB).

Two sets of outputs include a fixed output that is independent
from volume control, and a variable output that is volume
adjustable. All inputs and outputs are via 3.5 mm captive screw
connectors, and the volume settings are indicated by four LEDs.

The MVC offers RS-232 control of input gain/attenuation, and
control of output volume. RS-232 control also includes the
capability to turn the inputs and output on/off. The latest
firmware can be uploaded using RS-232 and the Extron control
program for Windows

Features

Furniture, rack, and projector mountability — The Extron

MVC 121 can be mounted under a desk or other
furniture, or mounted on a projector lift with optional
brackets. Alternatively, it can be rack mounted on an
optional rack shelf.

Microphone inputs — Built-in switchable microphone amplifier

with 48 V phantom power and separate level setting for
each microphone.

Front panel security lockout (executive mode) — The volume

settings for the inputs and the output can be protected
from unauthorized changes by enabling the executive
mode, although the volume settings can still be displayed
by the LEDs when the volume control knobs are turned.

Stand-alone volume controller — The MVC 121 can operate as

a volume controller for the main line level input with
both mic inputs turned off.

RS-232 control — Allows remote control of the MVC using the

Extron Simple Instruction Set
software for Windows, or other remote control system.

™

product line that mixes up to two mic

®

.

™

(SIS™), the Extron control

1-2

MVC 121 • Introduction

MVC 121 Mic/Line Mixer

Chapter Two

Installation and Operation

2

Mounting the MVC 121

Application Diagram

Rear Panel Features and Cabling

Front Panel Features

Installation and Operation

Mounting the MVC 121

The one rack unit high, quarter rack wide MVC can be set on a
table, mounted on a rack shelf, mounted under a desk or
tabletop, or mounted on a projector bracket.

Tabletop use

Each MVC comes with rubber feet (not installed). For tabletop
use, attach a self-adhesive rubber foot to each corner of the
bottom of the unit.

UL rack mounting guidelines

The following Underwriters Laboratories (UL) guidelines
pertain to the safe installation of the MVC 121 in a rack.

1. Elevated operating ambient temperature — If installed in

a closed or multi-unit rack assembly, the operating
ambient temperature of the rack environment may be
greater than room ambient temperature. Therefore,
install the MVC in an environment compatible with the
maximum ambient temperature (Tma = +122 °F, +50 °C)
specified by Extron.

2. Reduced air flow — Install the equipment in a rack so that

the amount of air flow required for safe operation of the
equipment is not compromised.

3. Mechanical loading — Mount the equipment in the rack

so that a hazardous condition is not achieved due to
uneven mechanical loading.

4. Circuit overloading — Connect the equipment to the

supply circuit and consider the effect that circuit
overloading might have on overcurrent protection and
supply wiring. Appropriate consideration of equipment
nameplate ratings should be used when addressing this
concern.

5. Reliable earthing (grounding) — Maintain reliable

grounding of rack-mounted equipment. Pay particular
attention to supply connections other than direct
connections to the branch circuit (e.g. use of power strips).

2-2

MVC 121 • Installation and Operation

Rack mounting

For optional rack mounting, do not install the rubber feet.
Mount the MVC on a VersaTools® 19" 1U rack shelf (Extron
RSF 123, part #60-190-20; Extron RSB 123, part #60-604-20), or a
standard Universal 1U or Basic rack shelf (Extron RSU 129, part
#60-190-01; Extron RSB 129 or #60-604-01). On the standard rack
shelf, the MVC mounts in one of four locations to the rear of the
rack or in one of four locations to the front of the rack.

1. If rubber feet were previously installed on the bottom of

the MVC, remove them.

2. Mount the MVC on the rack shelf, using two 4-40 x 3/16"

screws in opposite (diagonal) corners to secure the MVC
to the shelf.

DISTRIBUTION AMPLIFIER

VersaTools Rack Shelf

DISTRIBUTION AMPLIFIER

1/4 Rack Width
False Front Face Plate

VOL

M
IC

1

M

IC
2

M

A

IN

3

M
A

S
T

E

Use 2 mounting holes
on opposite corners

MIXER/VOLUME CO

R

NTROLLER

(2) 4-40 x 3/16" screws

Mounting the MVC on a VersaTools rack shelf

MVC 121 • Installation and Operation

2-3

Installation and Operation, cont’d

A
U

T
O

S
W

I
C

M

H

O

D
E

N
O

1

R
M

A

L

A

2

U

T
O

3

VOL

4

A

/
V S

MIC

W

1

IT

C

HE

R

MIC 2

MA

IN 3

MASTER

M

I
X

E
R

/
V

O

L
U

M

E

C
O

N
T

R
O

L

L
E

R

Mounting the MVC on a standard 1U rack shelf

3. Install blank panel(s) or other unit(s) on the rack shelf.

Furniture or projector mounting

Furniture mount or projector mount the MVC using the
optional mounting kit (Extron MBU 123, part #70-212-01,
furniture; or Extron PMK 100, part #70-217-01, projector) as
follows:

1. Attach the mounting brackets to the MVC with the

machine screws provided.

2. If feet were previously installed on the bottom of the

MVC, remove them.

D

I
S

T

R
I
B

U

T
I

O

N

A
M

P

L
I
F

I
E

R

M

D

D

A

I
S

S

T
R

I

E

B
U

R

T
I

IE

O

N

S

A
M

P

L
I
F

I
E

R

2-4

Furniture mounting

3a. Hold the MVC with the attached brackets against the

underside of the table or other furniture. Mark the
location of the screw holes of the bracket on the mounting
surface.

4a. Drill 3/32" (2 mm) diameter pilot holes, 1/4" (6.3 mm)

deep in the mounting surface at the marked screw
locations.

5a. Insert #8 wood screws into the four pilot holes. Tighten

each screw into the mounting surface until just less than
1/4" of the screw head protrudes.

6a. Align the mounting screws with the slots in the brackets

and place the MVC against the surface, with the screws
through the bracket slots. See the following illustration.

MVC 121 • Installation and Operation

VOL

M

IC

1

M

IC

2

M

A

IN

3

M

A

S

T

E

R

M

I
X

E

R

/
V

O
L

U

M

E

C

O

N

T

R

O
L

L

E
R

Mounting the MVC to furniture

7a. Slide the MVC slightly forward or back, then tighten all

four screws to secure the MVC in place.

Projector mounting

3b. Secure the MVC to a projector mount or other surface by

inserting the mounting bolt through the bracket’s slotted
hole, as shown below.

PMK 100

Mounting
Bolt

0.5A MAX
12V

POWER

CONTROLLER

MIXER/VOLUME

MVC 121

MIC

LINE

1

1

2

ON

2

1

3

2

L
E
V

4

E

L

INPUTS

OFF

4
8

ON

V

MIC 1

L

MAIN 3

MIC 2

R

L

VARIABLE

L

FIXED

R

TxRx

R

O
U

T

RS-232

P
U
T

S

1

2

MUTE

3

Projector

Mounting the MVC to a projector mount

MVC 121 • Installation and Operation

2-5

Installation and Operation, cont’d

Application Diagram

E
T

O
M
E
R

V
A
6

W
S

R

S
T

B

PU

L

T

OU

R

A

L

R

6

L

R

5

L

R

S

4

T

U

L

P

IN

3

LR

R

C

2

YN

S

L

R

S
T

1

U

P

IN

T

L

U
O

OUT
A
B

D
E

S

T

T

3
IS
2
L

U

T
.
1

5

P

E
.
.T
I

IN

S
U

6

C

3

A
3
.

4

0
V
0
4

1

-2
0
10

2

z

H
0

-6
0

Extron
SW 6AV

Switcher

5

Extron
MVC 121

Mixer/Volume
Controller

E
T
U

M

R

D

E

2
3

X

I

2

-

F

S
R

OUTPUTS

L

3
2

R

E

R

L

1

B

3

IA

N

R

I

x

A

A

R

V

M

x

T

L

L

2

S

IC

T

M

U

E

P
N
I

LUM

MVC 121

1

IC

48V

M

IXER/VO

N

OLLER

M

O

LEVEL

NTR

CO

R

F

E

F

N

O

O

W

O

4

P

E

N

X

I

3

L

12V

2

MA

2

1

1

0.5A

C
I

2

M

1

Audio Recorder

Contact Closure

Mute (AAP)

RS-232 Control

2-6

Wireless

Audio Amplifier

Microphone

MVC 121 • Installation and Operation

Rear Panel Features and Cabling

4 6

MVC 121

MIXER/VOLUME
CONTROLLER

POWER

12V

0.5A MAX

LINE

MIC

INPUTS

ON

1

1

LEVEL

2

2

48V

4

3

1

2

MAIN 3

L

ON

OFF

MIC 1

MIC 2

FIXED

R

L

L

VARIABLE

R

OUTPUTS

RS-232

R

Tx Rx

1

7 81 2 3 5

Power connector — Connect the included 12 VDC external

1

power supply into the 2-pole 3.5 mm captive screw connector.
Be careful to observe the correct polarity.

Smooth

CAUTION

Ridges

AA

SECTION A–A

Power Supply

Output Cord

When connecting the power supply, voltage

Tie Wrap

Orange Captive Screw

Connector

polarity is extremely important. Applying power
with incorrect voltage polarity could damage the
power supply and the MVC 121. Identify the
power cord negative (ground) lead by the ridges on
the side of the cord or a black heat shrink wrapping
around it.

MUTE

2

3

The two power cord wires must be kept separate
while the power supply is plugged in. Remove
power before wiring.

To verify the polarity before connection, check the no load
power supply output with a voltmeter.

CAUTION

The length of the exposed (stripped) copper wires is
important. The ideal length is 5/16” (7 mm).
Longer bare wires can short together. Shorter
wires are not as secure in the direct insertion
connectors and could be pulled out.

MVC 121 • Installation and Operation

2-7

Installation and Operation, cont’d

Use the supplied tie-wrap to strap the power cord to the
extended tail of the connector.

Your MVC 121 may have shipped with a blue captive
screw connector. This blue connector can be plugged
into either a blue or an orange power receptacle.

The ideal length of exposed (stripped) copper wire

for the blue connector is 3/16" (5 mm).

The blue connector does not have the extended tail or the
included tie-wrap.

Do not tin the power supply leads before installing in the
direct insertion connector. Tinned wires are not as
secure in the connectors and could be pulled out.

After making any adjustments to the MVC 121, either
via the front panel controls, SIS commands, or the
Extron Audio Products Control Program, wait at least
10 seconds after making those changes before
disconnecting power to the MVC 121. Failure to
observe the 10-second timeout may result in those
adjustments not being saved.

Mic input DIP switch— Mic 1 and Mic 2 inputs are controlled

2

via a DIP switch.

2-8

1. Set the mic input Level according to the microphone type:
a. Wireless mic: Set the mic’s DIP

switch to the Line position (On).

b. Wired mic: Set the mic’s DIP switch

to the Mic position (Off).

LINE

MIC

2. Set the 48V phantom power position according to
microphone type:

a. Condenser mic: Set the mic’s DIP switch to the On

position.

b. Dynamic mic: Set the mic’s DIP switch to the Off

position.

Condenser microphones require power. Dynamic
microphones do not require power.

When a mic’s input level DIP switch is set to “line”
level, that input’s 48V phantom power is disabled
regardless of the “48V” phantom power DIP switch
setting of that input.

MVC 121 • Installation and Operation

48V

LEVEL

ON

ON

OFF

1

4

2

3

1

1

2

2

CAUTION

DVD

Extron CSR 6 Adapter

MAIN 3

LR

3.5 mm mini stereo plug

Tip (L) Sleeve (GND)

Tip (L)

Ring (R)

Sleeve (GND)

Never set an unbalanced dynamic microphone to
48V, doing so may damage the microphone. For
condenser mics, verify that the mic will safely
operate at 48 VDC.

Mic 1 and Mic 2 input connector — Up to two mono

3

microphones, balanced and/or unbalanced, may be connected
to this 5-pole 3.5 mm captive screw connector. See the following
diagram.

Mic inputs will be evenly mixed into both left and right
outputs.

MIC 1

MIC 2

Balanced MIC

Unbalanced MIC

Example wiring of balanced and unbalanced mics

Main 3 line level input connector — Connect a line level audio

4

source to this 5-pole 3.5 mm captive screw connector, such as a
CD player, DVD player, tape deck, etc. Balanced or unbalanced
stereo connections can be wired to this connector.

Example of DVD line level input to Main 3 input

Input devices cabled with two RCA male outputs may be
connected to the 5-pole 3.5 mm captive screw connector
using the Extron CSR 6 adapter, part #26-575-01.

To wire the captive screw connectors to RCA or 3.5 mm mini
phone plugs, see the illustrations below.

RCA Connector

Tip (+)

Sleeve ( )

MVC 121 • Installation and Operation

2-9

Installation and Operation, cont’d

Tip

Sleeve

Tip

Sleeve

LR

Unbalanced Input

Variable output connector — The balanced/unbalanced stereo

5

Tip

Ring

Sleeve (s)

Tip

Ring

Balanced Input

LR

output to an amplifier from the 5-pole 3.5 mm captive screw
connector (see the diagrams below) is controlled by the Master
volume control knob on the front panel (see “Front Panel
Features” in this chapter). Adjust the speaker volume by using
the following sequence:

1. Adjust the amplifier’s volume down to its minimum
setting.

2. Adjust the Master volume control of the MVC to its default
level (volume = 80 when connecting to an unbalanced
consumer amp, or volume = 86 when connecting to a
balanced professional amp).

3. Adjust the amplifier’s volume to the desired level.

4. Make subsequent volume level adjustments by using the

MVC’s Master volume control.

Output devices cabled with two RCA male inputs may
be connected to the 5-pole 3.5 mm captive screw
connector using the Extron CSR 6 adapter,
part #26-575-01.

VARIABLE

LR

Extron CSR 6 Adapter

2-10

MVC 121 • Installation and Operation

Sound System

Example using the Variable output connected to an
amplified sound system

Tip

NO GROUND HERE

Sleeve (s)

Tip

NO GROUND HERE

Unbalanced Output

CAUTION

LR

Connect the sleeve to ground (Gnd). Connecting

Tip

Ring

Sleeve (s)

Tip

Ring

Balanced Output

the sleeve to a negative (-) terminal will damage the
audio output circuits.

LR

Fixed output connector — The balanced/unbalanced stereo

6

output from this 5-pole 3.5 mm captive screw
connector is output at a fixed volume level for
input to a recording device. Volume level can
be adjusted at the recording device.

The Master volume control knob on the front panel
operates independently from the fixed output.

The Fixed output connector is wired the same as the Variable
output connector. See 5, Variable output connector, for an
example application diagram with cabling instructions and a
caution.

Both the Fixed and Variable output connectors will
output audio simultaneously.

RS-232 connector — Connect an RS-232 device

7

(control system or PC) to the 3-pole 3.5 mm
captive screw connector for two-way RS-232
communication.

FIXED

R

L

RS-232

Tx Rx

Software for RS-232 control is included
with the MVC. See chapter 3, “Remote
Control”, for information on how to

Transmit (Tx)
Receive (Rx)

Ground (Gnd, )

install and use the control software and SIS commands.

Mute connector — Connect a contact closure device

8

to the 6-pole 3.5 mm captive screw connector to
mute the inputs, as follows:

1. Short and hold pin 1 to ground to mute Mic 1

input.

2. Short and hold pin 2 to ground to mute Mic 2 input.

3. Short and hold pin 3 to ground to mute Main 3 line level

input.

See chapter 3, the “Contact Closure Mute” section.

RS-232 and Mute share the same ground.

The associated input remains muted during the time period the
contact closure pin is shorted to ground and all the front panel
and RS-232 controls for that input are disabled. As soon as the
short is removed, the contact closure mute is disabled and the
other controls are enabled.

32

MUTE

2

3

1

MVC 121 • Installation and Operation

2-11

Installation and Operation, cont’d

VOL

+12 dB maximum

+10 dB

0 dB (default)

-30 dB

-50 dB

VOL

92 maximum

90

80

50 (default)

20

Front Panel Features

VOL

MIC 1

1

MIC 2 MAIN 3 MASTER

MIXER/VOLUME CONTROLLER

1

2

3

4

MVC 121

5

All front panel control knobs are speed sensitive. Turn
the knob quickly to make coarse gain/volume
adjustments or slowly to make fine adjustments.

Gain/Volume level LEDs — The four vertical LEDs indicate the

1

level setting of the last adjusted knob of the four front panel
volume control knobs for Mic 1, Mic 2, Main 3, and Master. If no
knob is adjusted within 5 seconds, all four LEDs turn off.
Turning any of the knobs clockwise increases the gain/volume
setting, and turning any of the knobs counterclockwise
decreases the gain/volume setting. A higher gain/volume level
is indicated by more LEDs being lit (from bottom to top).

When the Mic 1, Mic 2, and Main 3 maximum gain setting is
reached (+12 dB), the top LED flashes three
times. When the minimum setting is reached
(-79 dB) or if no knob is turned for 5 seconds,
the four LEDs are off until the next
adjustment. The default input gain setting is 0
dB. See the dB levels and the corresponding
LEDs in the illlustration.

When the maximum volume setting is reached (92), the top
LED will flash three times. When the minimum
setting is reached (0) or if no knob is turned for
5 seconds, the four LEDs are off until the next
adjustment. The default output volume setting
is 50. See the level and the corresponding LEDs
in the illustration on the right.

Mic 1 input volume control and on/off status LED — Turning

2

the knob clockwise increases the gain setting, and turning the
knob counterclockwise decreases the volume setting. The
on/off LED indicator lights whenever Mic 1 is on or not muted,
but the LED goes off after the minimum volume setting has
been reached.

2-12

MVC 121 • Installation and Operation

The gain level is indicated by the Gain/Volume level LEDs (see

).

1

Mic 2 input volume control and on/off status LED — Turning

3

the knob clockwise increases the gain setting, and turning the
knob counterclockwise decreases the volume setting. The
on/off LED indicator lights whenever Mic 2 is on or not muted,
but the LED goes off after the minimum volume setting has
been reached.

The gain level is indicated by the Gain/Volume level LEDs (see

).

1

Main 3 line level input volume control and on/off status LED

4

— Turning the knob clockwise increases the gain setting, and
turning the knob counterclockwise decreases the volume
setting. The on/off LED indicator lights whenever Main 3 is on
or not muted, but the LED goes off after the minimum volume
setting has been reached.

The gain level is indicated by the Gain/Volume level LEDs (see

1

).

Master output volume control and on/off status LED —

5

Turning the knob clockwise increases the volume setting, and
turning the knob counterclockwise decreases the volume
setting. The on/off LED indicator lights whenever master
output is on or not muted, but the LED goes off after the
minimum volume setting has been reached.

The output volume level is indicated by the Gain/Volume level
LEDs (see 1 ).

CAUTION

To prevent possible damage to audio equipment, the
output volume range may be specified by setting
the upper and lower limits via the Windows-based
Extron Audio Products Control Program or the SIS
commands.

See the chapter 3 sections, “Setting output

volume range limits” and “Using the
command/response table”.

Turning channels on/off

To turn a channel off, turn the knob counterclockwise until the
status LED goes off. To turn a channel on, turn the knob slightly
clockwise until the status LED goes on. Whenever an
input/output is being adjusted from the front panel, its
on/off status LED indicator goes on and all other on/off status
LED indicators and the Gain/Volume level LEDs go off for 5
seconds.

MVC 121 • Installation and Operation

2-13

Installation and Operation, cont’d

On/off status LEDs

If no adjustment of the front panel has occurred for 5 seconds,
the Gain/Volume level LEDs goes off. All the on/off status
LEDs next to each knob are active to indicate the current setting
(LED on indicates that the channel is on, LED off indicates that
the channel is muted or off).

Mute/unmute channel

A channel that has been muted by an SIS command can be
unmuted by turning the front panel knob clockwise.

For contact closure muted input, no front panel adjustment of
that input is allowed. Any attempt to adjust that input causes
the input’s status LED to blink 3 times.

Front panel security lockout (executive mode)

Executive mode is a security feature that prevents the front
panel knobs from being adjusted.

There are two forms of executive mode and each can only be
enabled/disabled via RS-232 commands. See chapter 3,
“Remote Control”, for command details.

1. Executive mode 1: The Mic 1, Mic 2, and Main 3 input gain

control knobs on the front panel are locked, although the
Gain/Volume level LEDs still show the current gain
settings for those inputs if any of those three knobs are
rotated slightly. For a muted input, no gain/volume level
will be displayed. The individual LED for each input gain
control knob flashes three times if that knob is rotated
while in Executive mode 1.

The Master output volume control knob is not locked in
Executive mode 1.

2. Executive mode 2: All four front panel volume control

knobs are locked, although the Gain/Volume level LEDs
still show the current gain/volume settings if any knobs
are rotated slightly. For a muted input, no gain/volume
level is displayed. The individual LED for each gain/
volume control knob flashes three times if that knob is
rotated while in Executive mode 2.

2-14

MVC 121 • Installation and Operation

MVC 121 Mic/Line Mixer

Chapter Three

3

Remote Control

RS-232 Programmer’s Guide

Windows-based Program Control

Contact Closure Mute

Remote Control

RS-232 Programmer’s Guide

The MVC 121 can be remotely controlled via a host
computer attached to the rear panel’s 3-pole captive
screw RS-232 connector. The protocol is 9600 baud,
1 stop bit, no parity, and no flow control.

The RS-232 control device (host) can use either Extron’s Simple
Instruction Set (SIS) commands or the graphical control
program for Windows. Windows control software is included
with the MVC.

The rear panel’s RS-232 3-pole female connector has the
following pin assignments:

Pin

RS-232 function Description

1 Tx Transmit data
2 Rx Receive data
3 Gnd Signal ground

Host-to-MVC communications

SIS commands consist of one or more characters per field. No
special characters are required to begin or end a command
sequence. When a command is valid, the MVC executes the
command and sends a response to the host device. All
responses from the MVC to the host end with a carriage return
and a line feed (CR/LF = ), which signals the end of the
response character string. A string is one or more characters.

RS-232

Rx

Tx

MVC-initiated messages

When a local event such as a front panel or contact closure
selection or adjustment takes place, the MVC sends a message
to the host. No response is required from the host. One MVC­initiated message is listed here (underlined).

(C) Copyright 2004, Extron Electronics, MVC 121, V x.xx
The MVC issues the copyright message when it first powers on.
V x.xx is the firmware version number.

Other examples of unsolicited responses are indicated in the SIS
command/response table by a
a response that could also be an unsolicited response.

Error responses

When the MVC 121 receives a valid SIS command, it executes
the command and sends a response to the host device. If the
MVC is unable to execute the command because the command

3-2

MVC 121• Remote Control

following every description of

is invalid or it contains invalid parameters, it returns an error
response to the host.

The error response codes and their descriptions are as follows:
E01 – Invalid channel number

E10 – Invalid command
E13 – Invalid value (the number is out of range)
E14 – Invalid command at this time (input on/off command not

valid during contact closure mute)

E23 – Firmware update failure

Using the command/response table

The command/response table lists valid command ASCII codes,
the MVC’s responses to the host, and a description of the
command’s function or the results of executing the command.
Lower case characters are acceptable in the command field only
where indicated. The ASCII to HEX conversion table below is
for use with the command/response table.

ASCII to HEX Conversion Table

•

The command/response table uses symbols (defined below) to
represent variables.

The SIS on/off commands and the equivalent front panel
operations have equal priority. The MVC will respond
to the latest settings from either SIS commands or front
panel operations.

Symbol definitions

= CR/LF (carriage return/line feed) (hex 0D 0A)

• = Space
= Every response that could also be an unsolicited response

will have this symbol at the end of each description of that
response.

X1

= Master (output) volume adjustment range (0 – 92),

default = 50 (-30 dB), gain (dB) =

X1

- 80

MVC 121• Remote Control

3-3

Remote Control, cont’d

X2

= Input or output to be adjusted (1 – 4)

1 = mic 1
2 = mic 2
3 = main line level
4 = master output

X3

= On/off status

0 = off (mute)
1 = on (unmute)
2 = mute by contact closure

X4

= Input audio gain/attenuation value

( -79 through +12)

X5

= Audio gain (per input)

(0 – 12)

X6

= Audio attenuation (per input)

(1 through 79)

X7

= Controller firmware version (listed to two decimal places,

i.e., x.xx)

X8

= Front panel security lockout (executive modes)

0 = off
1 = mode 1 (lock all front panel controls except master

volume)
2 = mode 2 (lock all front panel controls)

X9

= Rear panel DIP switch settings (0 through 15)

See the following tables.

48V

LEVEL

ON

LINE

ON - up

3-4

MIC

1

1

DIP switch 1

DIP switch 2

DIP switch 3

DIP switch 4

DIP switch 1

DIP switch 2

DIP switch 3

DIP switch 4

OFF - down

4

2

3

1

2

2

X9 =

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Level

Off

Off

Mic 1
Level

Mic 2

48V

Mic 1

48V

Mic 2

X9 =

Level

Mic 1
Level

Mic 2

48V

Mic 1

48V

Mic 2

Off

Off

Off

Off

Off

Off

On

Off

On

Off

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Mic

Mic

Mic

Mic

Mic

Mic

Off

Off

On

Off

On

Off

MVC 121 • Remote Control

DIP Switch Positions

Off

Off

Off

Off Off On On On On On On On On

On

On

Off

On

On

On On Off Off Off Off On On On On

On On Off Off On On Off Off On On

Off

Off

Off

Off On Off On Off On Off On Off On

On

DIP Switch Functions

Mic

Mic

Mic

Mic

On

On

Mic Mic Line LineLineLine LineLineLine Line

Line

Line

LineLine Mic Mic Mic Mic LineLine LineLine

On On Off Off Off Off Off Off Off Off

Off

Off

Off

Off Off Off On Off On Off Off Off Off

Off

where the status

X3

= 0/off, 1/on, 2/

X3

X2

= 0/off or 1/on.

X3

where

X3

to

X2

Set input

mute by contact closure. An input, while muted

X3

*

X2

!In

X3

*

(host to controller) (controller to host)

X2

of input

X3

See Note below.

Show the status

by contact closure, is not affected by SIS

commands or front panel operations.

is 0/off or 1/on or 2/mute by contact closure.

X3

!

X2

of master output where the

X3

where

Set output to

Show the status

status is 0/off or 1/on.

X3

X3

! Out4*

X3

! command results in the 2 response.

X2

*2 is sent following contact closure mute.

X2

! command results in the E14 error message response.

X3

*

X2

There are three ways to determine if an input has been muted by contact closure:

1. The unsolicited response In

Command ASCII Command Response Additional description

Initial power up ©Copyright 2003, Extron Electronics, MVC 121, V 1.00

Turn input on/off

Turn input on/off (unmute/mute)

View input on/off status

Turn output on/off 4*

View output on/off status 4!

Turn Master Output on/off

MVC 121 • Remote Control

After an input is no longer muted, the input will be restored back to the settings that were in effect prior to the

2. Querying the status using the

mute, including volume gain control and input on/off status.

3. Sending the

3-5

Remote Control, cont’d

X4

.

X1

Set the output volume to

Increment the volume in 1 dB steps.

Decrement the volume in 1 dB steps.

Show the output volume.

where 0 = off, 1 =

X8

Set executive mode to

mode 1, and 2= mode 2. See Front panel security

lockout (executive mode) in chapter 2.

=

X8

Show executive mode status.

Show rear panel DIP switch settings, where

16 possible DIP switch setting (0 – 15). See the

DIP switch settings tables under Symbol

definitions in this chapter.

.

X4

in 1 dB steps.

to

in 1 dB steps.

.

X2

X4

.

X2

X2

X2

to

X2

of input

Set the gain of input

Set the attenuation of input

Increment the gain of input

Decrement the gain of input

Show the gain

X4

X4

X4

X4

X1

X1

X1

X1

V/v Vol

(host to controller) (controller to host)

Command ASCII Command Response Additional description

3-6

X1

Decrement volume** -V/v Vol

Specify a volume setting**

Master Output volume control (see Gain/volume adjustment note on page 3-7)

View output volume level** V/v

Increment volume** +V/v Vol

MVC 121 • Remote Control

•Gain

•Gain

•Gain

X8

X8

X9

X2

GIn

X/x Exe

X8

Set executive mode**

Front panel security lockout (executive mode)

View executive mode status** X/x

Request general info** I/i

Information request

Request for part number** N/n 60-572-01 Show the MVC 121 part number.

Request for part number

X5

*

X2

Set gain (+dB)

Input gain control (see Gain/volume adjustment note on page 3-7)

•Gain

X2

X2

X2

gIn

X6

+G/g In

-G/g In

*

X2

X2

X2

Decrement gain**

Set attenuation (-dB)

Increment gain**

X4

G/g

X2

View input gain level**

** These commands use both uppercase and lowercase characters, e.g., X or x (X/x), I or i (I/i), etc.

to Host

SIS Message

= 50 (-30 dB).

X1

= 0 dB.

X5

Volume

Change

...

...

.

Vol 5 1

Vol 5 1

...

.

51.0

51.5

Vol 5 2

52.0

Vol 5 2

52.5

Vol 5 3

...

53.0

.

.

See Note below.

Upload Go See Note below.

(host to controller) (controller to host)

Esc

Show the MVC’s firmware version.

Master output volume:

All input volume:

Upload command. After receiving the Go response,

Esc

response once the update has been successfully completed. It will send the

Firmware updates will periodically become available on the Extron Web site. To update the firmware, first download the

update file from the site. Then open HyperTerminal and type the

error code E23 if the update failed.

select Send Text File from the Transfer menu. In the Send Text File window, locate and select the file you downloaded and

click Open. The controller will send the UPL

X7

ZXXX Zpx Note: factory default should be as follows:

Esc

All front panel gain/volume adjustments are in 0.5 dB increments whenever the knobs are turned

slowly. However, the SIS messages (RS-232) that the MVC sends to the host are in 1 dB

increments only. The MVC treats each 0.5 dB gain/volume increment between two consecutive

whole dB units as the lower of the two units. As shown in the table examples, in a continuous

adjustment sequence, the SIS messages to the host will send the same value twice.

Upload firmware

Command ASCII Command Response Additional description

Upload success UPL

Update firmware

Query software version** Q/q

Query software version

Reset to factory default

System reset

Gain/volume adjustment note:

MVC 121 • Remote Control

3-7

Remote Control, cont’d

.

.

X1

X1

Set the volume range lower limit to

Set the volume range upper limit to

X1

X1

.

.

X1

X1

Show the volume range lower limit

Show the volume range upper limit

X1

X1

*21# Vll4 *

*22# Vul4 *

X1

X1

(host to controller) (controller to host)

Set volume range lower limit 4*

Command ASCII Command Response Additional description

3-8

Set volume range upper limit 4*

Set volume range limit

View volume range limit

MVC 121 • Remote Control

View volume range lower limit 4*21#

View volume range upper limit 4*22#

Windows-based Program Control

The Extron Audio Products Control Program is compatible with
Windows 2000 and Windows XP, and provides remote control of
the input gain/attentuation, output volume output adjustment,
and other features.

Updates to this program can be downloaded from the Extron
Web site (http://www.extron.com).

Installing the software

The program is contained on the EXtron Software Products CD­ROM, disk B. Install the software as follows:

1. Insert the CD-ROM into the drive

2. Click the Software tab.

3. Scroll to the desired program and click Install.

4. Follow the on-screen instructions. By default, the

Windows installation creates a C:\Program
Files\Extron\AudProds folder and saves the program
there.

MVC 121 • Remote Control

3-9

Remote Control, cont’d

Using the software

To run the software:

1. Double click the Audio Products Control Program icon in

the Extron Electronics program group.

2. Click the comm port that is connected to the unit’s remote

connector.

3. Click OK. The Audio Products Control Program

main window displays the input gain/attenuation
settings for each channel and allows the user to
adjust them. The user can also adjust the volume
setting for the output channel. See “Setting output volume
range limits” in this chapter.

3-10

The window contains channel mute, front panel lock out
(executive modes), and unit reset controls.

The front panel lockout feature prevents unauthorized
adjustments to the MVC’s front panel. See Front panel
security lockout (executive mode) in chapter 2.

Setting output volume range limits

The Master output volume control can be configured with
upper and lower range limits to restrict the volume output.
Setting range limits may prevent possible damage to audio
equipment. From the File drop-down menu, select Advanced
Setup, then select Set Limits.

MVC 121 • Remote Control

From the Master output volume range indicator, set the upper
and lower range limits by moving the arrowhead indicators.
After setting the limits, the output volume can only be set
within the specified range limits, as shown below.

MVC 121 • Remote Control

3-11

Remote Control, cont’d

Using the help system

For information about program features, you can access the
help program in any of the following ways:

• From the Extron Electronics program group,
double-click the Audio Products Help icon.

• From within the Audio Products Control
program, click Help on the task bar.

• From within the Audio Products Control program, press
the F1 key.

Updating the firmware

Firmware updates will be available on the Extron Web site. To
load a firmware update:

1. Download the update file from the Extron Web site

(www.extron.com).

2. Run the Audio Products Control Program.

3. On the File menu, click Update Firmware. The Firmware

Loader window appears.

32

MUTE

2

3

1

3-12

Firmware Loader window

4. Click the Upload Firmware File button.

5. Locate and select the update file you downloaded from the

Web site and click Open. The Firmware Loader loads the
update.

The firmware update file must have an .s19 extension. If
it does not have that extension it will not work properly.

6. When the program is finished loading the update, click

Exit.

MVC 121 • Remote Control

Contact Closure Mute

For contact closure mute, connect a contact closure remote
control device to the rear panel’s female 6-pole captive screw
connector. The pin assignments for the MVC’s contact closure
mute connector are shown in the following table.

Pin

1 Connect pin 1 to Gnd Mute input Mic 1
2 Connect pin 2 to Gnd Mute input Mic 2
3 Connect pin 3 to Gnd Mute input Main 3

Contact closure Description

Gnd Signal ground

Contact closure mute has higher priority over both SIS
commands and front panel operations and is not affected
by either SIS commands or front panel operations.

After contact closure mute has been removed, the input
settings will return to the original settings that were in
effect prior to the mute, including input on/off status
and gain setting.

MVC 121 • Remote Control

3-13

Remote Control, cont’d

3-14

MVC 121 • Remote Control

MVC 121 Mic/Line Mixer

A

Appendix

Specifications, Part Numbers,

and Accessories

Specifications

Included Parts

Optional Accessories

Specifications, Parts, and Accessories

Specifications

Audio

Gain from mic input to both fixed and variable outputs at default settings

Mic DIP switch = line level .......... Unbalanced output: +20 dB; balanced

output: +26 dB

Mic DIP switch = mic level .......... Unbalanced output: +50 dB; balanced

output: +56 dB

Gain from main input to both fixed and variable outputs at default settings

Unbalanced output: 0 dB; balanced output:
+6 dB

Master volume range .................. 0 to 92 (“off”, and -79 dB to +12 dB in 0.5

dB steps)
Mic 1, 2, and Main 3 gain range . -79 dB to +12 dB in 0.5 dB steps

Frequency response .................... 20 Hz to 20 kHz, ±0.05 dB

THD + Noise................................. 0.03% @ 1 kHz at nominal level

S/N ................................................ >90 dB, balanced, at maximum output

Crosstalk ....................................... <-80 dB @ 1 kHz, <-60 dB @ 20 kHz, fully

loaded

Stereo channel separation .......... >80 dB @ 1 kHz, >60 dB @ 20 kHz

CMRR ............................................ >75 dB @ 20 Hz to 20 kHz

N All input gain default settings are at 80. The master volume

default setting is 50 (-30 dB).

Audio input

Number/signal type

Microphone inputs .......... 2 mono, balanced/unbalanced

Main input ......................... 1 stereo, balanced/unbalanced

Connectors

Microphone inputs .......... (1) 3.5 mm captive screw connector, 5 pole

Main input......................... (1) 3.5 mm captive screw connector, 5 pole

Impedance .................................... >10k ohms, DC coupled

Nominal level (mic inputs)

DIP switch = line level ..... -30 dBV (32 mV) for a wireless

microphone

DIP switch = mic level ..... -60 dBV (1 mV) for a wired microphone

Nominal level (main input) ........ -10 dBV (316 mV)

Maximum level ............................ +20 dB above nominal level, (balanced or

unbalanced) at 1% THD+N

Input gain adjustment ................. -79 dB to +12 dB, adjustable per input

A-2

MVC 121 • Specifications, Parts, Accessories

Input level sensitivity (mic inputs)

DIP switch = line level ..... -42 dBV (8 mV) for nominal output

DIP switch = mic level ..... -72 dBV (0.25 mV) for nominal output

Input level sensitivity (main input)

-22 dBV (79 mV) for nominal output

N 0 dBu = 0.775 Vrms, 0 dBV = 1 Vrms, 0 dBV H” 2 dBu

Audio output

Number/signal type ................... 2 stereo, balanced/unbalanced

Connectors ................................... (2) 3.5 mm captive screw connector, 5 pole

Impedance .................................... 50 ohms unbalanced, 100 ohms balanced

Gain error ..................................... ±0.1 dB channel to channel

Nominal level ............................... +4 dBu (1.23 V), balanced output (when

gain is set to +6 dB)

-10 dBV (0.316 V), unbalanced output

Maximum level (Hi-Z) ................ >+24 dBu, balanced; >+18 dBu, unbalanced

at 1% THD+N

Maximum level (600 ohm) ......... >+15 dBm, balanced at 1% THD+N

Control/remote— mixer/volume controller

Serial control port ........................ RS-232, 3.5 mm female captive screw

connector (3 poles of a 6 pole connector)

Baud rate and protocol ............... 9600, 8-bit, 1 stop bit, no parity

Serial control pin configurations 1 = TX, 2 = RX, 3 = GND

Contact closure mute control .... 1 = mic 1, 2 = mic 2, 3 = main input

Program control .......................... Extron’s control program for Windows

Extron’s Simple Instruction Set (SIS™)

®

General

External power supply................ 100 VAC to 240 VAC, 50/60 Hz, external;

to 12 VDC, 1 A, regulated

Power input requirements ......... 12 VDC, 0.5 A.

Temperature/humidity .............. Storage -40° to +158°F (-40° to +70°C) /

10% to 90%, noncondensing

Operating +32° to +122°F (0° to +50°C) /

10% to 90%, noncondensing

Cooling .......................................... Convection, no vents

Mounting

MVC 121 • Specifications, Parts, Accessories A-3

Specifications, Parts, and Accessories, cont’d

Rack mount ...................... Yes, with optional 1U, 9.5" deep rack shelf

(RSU 129, #60-190-01; RSB 129, 60-604-01);
1U, 6" deep rack shelf (RSU 126, #60-190­10; RSB 126, 60-604-10); or VersaTools

3.5" deep rack shelf (RSF 123, #60-190-20;
RSB 123, 60-604-20)

Furniture mount .............. Yes, with optional VersaTools mini under-

desk mounting kit, part #70-212-01 (MBU

123)

Pole mount ....................... Yes, with VersaTools mini pole mount kit,

part #70-217-01 (PMK 100)

Enclosure type ............................. Metal

Enclosure dimensions ................. 1.7" H x 4.3" W x 3.0" D (1U high, quarter

rack wide)

(4.3 cm H x 10.9 cm W x 7.6 cm D)

(Depth excludes connectors and knobs.)

Product weight............................. 0.6 lbs (0.3 kg)

Shipping weight ........................... 3 lbs (2 kg)

Vibration ....................................... ISTA 1A in carton (International Safe

Transit Association)
Regulatory compliance

Safety ................................. CE, CUL, UL

EMI/EMC ......................... CE, C-tick, FCC Class A, ICES, VCCI

MTBF ............................................. 30,000 hours

Warranty ....................................... 3 years parts and labor

®

1U,

N All nominal levels are at ±10%.

N Specifications are subject to change without notice.

A-4

MVC 121 • Specifications, Parts, Accessories

Included Parts

These items are included in each order for an MVC 121:

Included parts Replacement part number

MVC 121 60-572-01

3.5 mm, 5-pole captive screw connectors (4) 10-319-10

3.5 mm, 2-pole captive screw connector 10-319-15

3.5 mm, 6-pole captive screw connector 10-319-14
MVC 121 User’s Guide
12 VDC, 1 A external power supply 70-055-01
Rubber feet
Windows-based control software

Optional Accessories

Accessory Part number

RSF 123 VersaTools
RSB 123 VersaTools rack shelf 60-604-20
RSU 129 1U universal rack shelf 60-190-01
RSB 129 1U basic rack shelf 60-604-01
RSU 126 6" deep universal rack shelf kit 60-190-10
RSB 126 6" deep basic rack shelf 60-604-10
MBU 123 under-desk mount kit 70-212-01
PMK 100 mini projector mount kit 70-217-01

®

rack shelf kit 60-190-20

MVC 121 • Specifications, Parts, Accessories

A-5

Specifications, Parts, and Accessories, cont’d

MVC 121 • Specifications, Parts, Accessories

Extron’s Warranty

Extron Electronics warrants this product against defects in materials and workmanship
for a period of three years from the date of purchase. In the event of malfunction during

the warranty period attributable directly to faulty workmanship and/or materials,
Extron Electronics will, at its option, repair or replace said products or components,
to whatever extent it shall deem necessary to restore said product to proper operating

condition, provided that it is returned within the warranty period, with proof of
purchase and descripti

on of malfunction to:

USA, Canada, South America,
and Central America:

Extron USA
1001 East Ball Road
Anaheim, CA 92805
U.S.A.

Europe, Africa, and the Middle East:

Extron Europe
Hanzeboulevard 10
3825 PH Amersfoort
The Netherlands

Asia:

Extron Asia
135 Joo Seng Road #04-01
PM Industrial Bldg.

Singapore 368363
Singapore

This Limited Warranty does no
handling care, electrical or mechanical abuse, abnormal operating conditions or non­Extron authorized modifi cation to the product.

If it has been determined that the product is defective, please call Extron and ask for an
Applications Engineer at [phone] (USA), 31.33.453.4040 (Europe), 65.6383.4400
(Asia), or 81.3.3511.7655 (Japan) to receive an RA# (Return Authorization number). This
will begin the repair process as quickly as possible.

Units must be returned insured, with shipping charges prepaid. If no
assume the risk of loss or damage during shipment. Returned units must include the
serial number and a description of the problem, as well as the name of the person to
contact in case there are any questions.

Extron Electronics makes no further warra
to the product and its quality, performance, merchantability, or fi tness for any particular
use. In no event will Extron Electronics be liable for direct, indirect, or consequential

damages resulting from any defect in thi
advised of such damage.

Please note that laws vary from state to state and country to country, and that some
provisions of this warranty may not apply to you.

t apply if the fault has been caused by misuse, improper

nties either expressed or implied with respect

s product even if Extron Electronics has been

Japan:

Extron Japan
Kyodo Building
Chiyoda-ku, Tokyo 102-0082
Japan

China:

Extron China
686 Ronghua Road

Songjiang District
Shanghai 201611
China

Middle East:

Extron Middle East
Dubai Airport Free Zone
F12, PO Box 293666
United Arab Emirates, Dubai

, 16 Ichibancho

t insured, you

© 2009 Extron Electronics. All rights reserved.