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