Extron electronics MVC 121 Plus User manual

User Guide

MVC 121 Plus

Audio Products:

Mixers and Processors

Three Input Stereo Mixer with DSP

68-1937-01 Rev.B

05 12

This symbol is intended to alert the user of important operating and mainte-

nance (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.

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.

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.

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.

Safety Instructions • English

Consignes de Sécurité • Français

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.

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 qualiziertem 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 empndlichen 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.

Este símbolo se utiliza para advertir al usuario sobre instrucciones impor-

tantes 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 elemen-

tos 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.

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 calicado. 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.

Instrucciones de seguridad • Español

安全须知 • 中文

这个符号提示用户该设备用户手册中有重要的操作和维护说明。

这个符号警告用户该设备机壳内有暴露的危险电压，有触电危险。

注意

阅读说明书 • 用户使用该设备前必须阅读并理解所有安全和使用说明。

保存说明书 • 用户应保存安全说明书以备将来使用。

遵守警告 • 用户应遵守产品和用户指南上的所有安全和操作说明。

避免追加 • 不要使用该产品厂商没有推荐的工具或追加设备，以避免危险。

警告

电源 • 该设备只能使用产品上标明的电源。设备必须使用有地线的供电系统供电。第三条线（

地线）是安全设施，不能不用或跳过。

拔掉电源 • 为安全地从设备拔掉电源，请拔掉所有设备后或桌面电源的电源线，或任何接到市电

系统的电源线。

电源线保护 • 妥善布线，避免被踩踏，或重物挤压。

维护 • 所有维修必须由认证的维修人员进行。设备内部没有用户可以更换的零件。为避免出现触

电危险不要自己试图打开设备盖子维修该设备。

通风孔 • 有些设备机壳上有通风槽或孔，它们是用来防止机内敏感元件过热。不要用任何东西

挡住通风孔。

锂电池 • 不正确的更换电池会有爆炸的危险。必须使用与厂家推荐的相同或相近型号的电池。按

照生产厂的建议处理废弃电池。

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. Operation is subject to the following two conditions:

1. This device may not cause harmful interference.

2. This device must accept any interference received, including interference that may cause undesired operation.

The Class A 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 commu-

nications. 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.

NOTE: This unit was tested with shielded cables on the peripheral devices. Shielded cables must be used with

the unit to ensure compliance with FCC emissions limits.

For more information on safety guidelines, regulatory compliances, EMI/EMF compliance, accessibility, and

related topics, click here.

Conventions Used in this Guide

In this user guide, the following are used:

NOTE: A note draws attention to important information.

TIP: A tip provides a suggestion to make working with the application easier.

CAUTION: A caution indicates a potential hazard to equipment or data.

WARNING: A warning warns of things or actions that might cause injury, death, or

other severe consequences.

Commands are written in the fonts shown here:

^AR Merge Scene,,Op1 scene 1,1 ^B 51 ^W^C

[01] R 0004 00300 00400 00800 00600 [02] 35 [17] [03]

E

X!

*

X1&

*

X2)

*

X2#

*

X2!

CE

}

NOTE: For commands and examples of computer or device responses mentioned in

this guide, the character “0” is used for the number zero and “O” repre-

sents the capital letter “o.”

Computer responses and directory paths that do not have variables are written in the font

shown here:

Reply from 208.132.180.48: bytes=32 times=2ms TTL=32

C:\Program Files\Extron

Variables are written in slanted form as shown here:

ping xxx.xxx.xxx.xxx —t

SOH R Data STX Command ETB ETX

Selectable items, such as menu names, menu options, buttons, tabs, and field names are

written in the font shown here:

From the File menu, select New.

Click the OK button.

Copyright

Trademarks

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

vMVC 121 Plus • Contents

Introduction .....................................................1

About This Guide ................................................ 1

MVC 121 Plus Description................................... 1

MVC 121 Plus Features ....................................... 2

MVC 121 Plus Application Diagram .................... 3

Rear Panel Features ............................................. 4

Front Panel Features ............................................ 8

Operation ........................................................ 11

MVC 121 Plus Operation ...................................11

Front Panel Operation ....................................12

Rear Panel Operation .....................................12

Power Cycle ...................................................13

Firmware Updates ..........................................13

Reset Actuator and LED .................................13

Digital input port ...........................................14

DSP Processing and Signal Flow .........................16

Mic/Line Input Signal Chain ............................16

Filter Processor Block ..........................................18

Filter ..................................................................18

Mixer .................................................................23

Output Channels ...............................................28

Volume ..........................................................28

Gain ..............................................................28

SIS Programming and Control ....................... 29

Connection Options ...........................................29

RS-232 Port ...................................................29

USB Port (front panel) ....................................30

MVC 121 Plus-initiated Messages ..................30

Using the Command/Response Tables ............30

Error Responses..............................................31

Command/Response Table for Basic SIS

Commands .......................................................31

Symbol definitions .........................................31

Command/Response Tables for DSP SIS

Commands .......................................................36

Error responses ..............................................37

Symbol definitions .........................................37

Table 1.

X6)

— Level Control and Mix-point

Selection Tables <OID> .................................39

Software Control ............................................ 40

Software Control ...............................................40

Windows-based Program Control ......................40

Installing the DSP Configurator Program ........40

Install the USB Driver ......................................42

DSP Configurator Program .................................43

Starting the Program ......................................43

Using the Program .........................................44

Help ...............................................................44

Emulate Mode vs. Live Mode .............................45

Synchronizing: Pull vs. Push ............................45

Selecting Live Mode and Pushing or Pulling a

Configuration ...............................................46

Reference Information ................................... 49

Specifications .....................................................49

Part Numbers and Accessories ............................51

Included Parts ................................................51

Accessories ....................................................51

Mounting ..........................................................52

Tabletop Use ..................................................52

UL Rack Mounting Guidelines ........................52

Rack Mounting ..............................................52

Furniture Mounting ........................................53

Firmware Loader ................................................54

MVC 121 Plus Hardware Reset Modes ...............56

Contents

MVC 121 Plus • Contents vi

Introduction

This section describes this manual and the MVC 121 Plus, including:

• About This Guide

• MVC 121 Plus Description

• MVC 121 Plus Features

• MVC 121 Plus Application Diagram

About This Guide

This guide contains information about the Extron MVC 121 Plus audio mixer and volume

controller with DSP. Unless otherwise specified, references in this guide to the “mixer” or

“MVC” relate to the features or operation of the MVC 121 Plus.

MVC 121 Plus Description

The MVC 121 Plus is an audio mixer and volume controller that will mix up to two

mic/line inputs (mono, balanced or unbalanced) with one line level input (stereo, balanced or

unbalanced). All audio input signals are converted from analog to digital prior to processing

or routing. Each mic input and the stereo line level input have their own gain control

adjustment screws, and the mixed output also features a volume control knob.

The MVC offers gain, Parametric EQ filter, and tone processing with quick and intuitive

configuration using the DSP Configurator

™

software. The DSP built into the MVC provides

wide dynamic range and utilizes 24-bit audio converters with 48 kHz sampling to maintain

audio signal transparency.

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 gain/volume settings are indicated by an eight segment LED

ladder.

Rotating the gain adjustment screw clockwise increases gain, rotating the screw

counterclockwise decreases gain. Gain values adjust in 1 dB increments.

Volume adjustment interval varies with knob rotation, that is, turning the knob clockwise

increases the volume and turning the knob counterclockwise decreases the volume. The

volume is increased more rapidly at lower volume settings.

The MVC offers RS-232 control of input gain/attenuation, and control of output volume.

The latest firmware can be uploaded using RS-232 or USB and the Extron Firmware Loader

program for Windows

®

.

MVC 121 Plus • Introduction 1

MVC 121 Plus Features

Emulate and live modes for configuration — The DSP Configurator control program

can be used in emulate mode to create an MVC 121 Plus configuration offline. The

modifications can be saved and applied to the unit when a connection is established. In

live mode, the changes are made directly to the unit.

Two mic/line inputs and one line level input — Two mic/line (mono, balanced or

unbalanced) inputs can mix with one line level (stereo, balanced or unbalanced) input.

Fixed and variable outputs — The MVC includes a fixed output and a volume

adjustable variable output.

Multi-function LED level indicator — Automatically displays the mix-point gain or

output volume setting for the front panel controls, and also functions as an output level

meter.

Fixed, low latency DSP processing — Input to output latency within the MVC 121 Plus

is fixed regardless of the number of active channels or processes. Fixed, low latency

processing keeps audio in sync with video, and prevents distractions to the presenter

resulting from delayed live audio.

48-volt phantom power for condenser microphones — 48 VDC phantom power is

available for mic inputs 1 and 2.

Soft limits provide optimal adjustment range — The volume range for the variable

output and the gain range for the three mix points can be limited using the soft limits

to maintain optimal minimum and maximum levels when using external control. This

prevents operators from over or under-adjusting levels when using digital I/O or RS-232

control. The DSP Configurator software provides quick drag-and-drop adjustment of soft

limits.

SpeedNav

™

keyboard navigation

— SpeedNav enables user-friendly, keyboard-based

navigation of the DSP Configurator software without the need for a mouse or touchpad.

Using keyboard navigation keys and shortcuts, the user can access any input or output,

mix-points, and all audio DSP tools. Using only the keyboard for software access can help

expedite audio system setup and commissioning.

Rear panel RS-232 control port — The MVC 121 Plus can be configured using Extron

Simple Instruction Set (SIS

™

) commands from a PC using an RS-232 cable.

Front panel USB control port — The MVC 121 Plus can be configured by Extron Simple

Instruction Set (SIS) commands from a PC using a USB cable.

MVC 121 Plus • Introduction 2

MVC 121 Plus Application Diagram

100-240V 50-60Hz

I

N

P

U

T

VID

YC

Y

B-Y

R-Y

RGB

DVI

8

1

2

4

5

3

L

2

1

3

4 5

6

7

R

AUDIO INPUT

L

A

B

RS-232

R

OUTPUT

L

R

OUTPUT

RGB

Y, B-Y, R-Y

8

7

RGB

6

LISTED

1T23

I.T.E.

C

U S

CLASS 2 WIRING

STANDBY

L

(MONO)

R

LISTED

C US

70 V

OUTPUT

VOL/MUTE

50 mA10V

REMOTE

INPUTS

LIMITER/

PROTECT

SIGNAL

LEVEL

0

HPF

OFF

80 Hz

XPA 2001-70V

17TT

AUDIO/VIDEO

APPARATUS

100-240V 1.3A, 50-60Hz

2

1

+48V

MIC

I

N

P

U

T

S

1 2MIC/LINE

LINE 3

O

U

T

P

U

T

S

L

R

L

POWER

0.3A MAX

12V

RS-232

21

Tx

Rx

VARIABLE

FIXEDL R

DIGI IN

3

MIXER/VOLUME

CONTROLLER

MVC 121 Plus

1

3

1

4

2

3

1

4

2

3

1

4

2

3

100

LINK

ACT

COM

IR

INPUT

RELAY

TX

RX

R

IPL 250

®

ON

OFF

DISPLAY

MUTE

SCREEN

UP

SCREEN

DOWN

VCR

DVD

DOC

CAM

LAPTOP

PC

Extron

IN1508

Scaling Presentation

Switcher

Laptop

Desk Microphone

PC

PC Podcasting/

Recording Station

PC

TCP/IP

TouchLink

™

Control

System

Extron

SI 26CT

Two-way Ceiling

Speakers

Extron

XPA 2001-70V

Power

Amplier

Extron

MVC 121 Plus

Three Input Stereo

Mixer with DSP

Figure 1. MVC 121 Plus Application Diagram

MVC 121 Plus • Introduction 3

Installation

This section describes the features and connectors for the MVC 121 Plus:

• Rear Panel Features

• Front Panel Features

Rear Panel Features

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

Figure 2. MVC 121 Plus Rear Panel

a Power connector — Connect the two pole, 3.5 mm captive screw connector from

the 12 VDC external power supply (provided) to this socket on the rear panel. Ensure

the connections have the correct polarity as shown in the illustration below:

Power Receptacle

Power Supply

Output Cord

SECTION A–A

RidgesSmooth

AA

DC Power Cord

Captive Screw Connector

AC Power Cord

Ground

+12 VDC

External

Power Supply

(12 VDC, 1 A )

POWER

12V

3A MAX

Figure 3. Power Supply Connection

MVC 121 Plus • Installation 4

CAUTION: Always use a power supply supplied or specified by Extron. Use

of an unauthorized power supply voids all regulatory compliance

certification and may cause damage to the supply and the end

product.

Unless otherwise stated, the AC/DC adapters are not suitable for

use in air handling spaces or in wall cavities. The power supply is

to be located within the same vicinity as the Extron AV processing

equipment in an ordinary location, Pollution Degree 2, secured to the

equipment rack within the dedicated closet, podium or desk. Power

over Ethernet (PoE) is intended for indoors use only. No part of the

network that uses PoE can be routed outdoors.

The installation must always be in accordance with the applicable

provisions of National Electrical Code ANSI/NFPA 70, article 75 and the

Canadian Electrical Code part 1, section 16. The power supply shall

not be permanently fixed to building structure or similar structure.

NOTE: The length of the exposed wires in the stripping process is critical. The

ideal length is 3/16 inches (5 mm). Any longer and the exposed wires may

touch, causing a short circuit between them. Any shorter and the wires

can be easily pulled out even if tightly fastened by the captive screws.

Do not tin the wires. Tinned wire does not hold its shape and can become

loose over time.

b Mic 1 and 2 +48 V phantom power LED indicators — The LED lights whenever the

corresponding mic phantom power is on and goes off when the phantom power is

off.

c Mic/line inputs 1 and 2 — Up to two mono microphones or line level signals,

balanced and/or unbalanced, may be connected to the 6-pole 3.5 mm captive screw

connector. Inputs provide gain settings to accommodate consumer and pro operating

line level sources, with sufficient gain to support mic level audio.

12MIC/LINE

Balanced MIC Unbalanced MIC

Jumper

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

MVC 121 Plus • Installation 5

d Line input 3, left (L) and right (R) — A line level audio source, such as a CD player,

output from a switcher, DVD player, or other audio device, may be connected to

the 5-pole 3.5 mm captive screw connector. Line inputs provide gain settings to

accommodate consumer and pro operating line level sources. Balanced or unbalanced

stereo connections can be wired to this connector (see the following example

diagram).

DVD

CSR 6 RCA Adapter

MAIN 3

LR

MVC 121 MAIN wiring.eps

NOTE: 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 number 26-575-01, as shown above.

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

following illustrations below.

Tip (+)

Sleeve ( )

RCA Connector

Sleeve ( )

Ring (R)

Tip (L)

3.5 mm Stereo

Plug Connector

Balanced audio

Tip

Ring

Tip

Ring

LR

Sleeves

Unbalanced audio

Tip

Sleeve

Tip

LR

Do not tin the wires!

e Variable output left (L) and right (R) — The balanced/unbalanced stereo output

to an amplifier from the 5-pole 3.5 mm captive screw connector is controlled by the

large main volume control knob on the front panel. See the Front Panel Features

section. Volume range is from 0 to 100%, or -100 to 0 dB.

Adjust the speaker volume by using the following sequence:

1. Adjust the volume of the amplifier down to its minimum setting.

2. Adjust the main volume knob of the MVC to its default level of 100% volume, or

0 dB.

3. Adjust the volume of the amplifier to the desired level.

4. Make subsequent volume level adjustments by using the volume knob of the

MVC.

NOTE: Output 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 number 26-575-01, as shown in the following illustration.

MVC 121 Plus • Installation 6

Sound System

CSR 6 RCA Adapter

VARIABLE

LR

Unbalanced Stereo Output

Tip

NO GROUND HERE.

Sleeve(s)

Tip

NO GROUND HERE.

Balanced Stereo Output

Tip

Ring

Sleeve(s)

Tip

Ring

LR

Left

Right

Left

Right

Do not tin the wires!

CAUTION: Connect the sleeve to ground. Connecting the sleeve to a negative

( –) terminal will damage the audio output circuits.

f Fixed output left (L) and right (R) — The balanced/unbalanced stereo output from

the 5-pole 3.5 mm captive screw connector is output at a fixed volume adjustable gain

level for input to a recording device. Level can be adjusted at the recording device, or

using output gain control with a range of -24 to +12 dB.

NOTE: The main volume control knob on the front panel operates independently

of the fixed output. Both the fixed and variable output connectors will

output audio simultaneously.

The fixed output connector is wired the same as the variable output connector. See

e

, variable output connector, for an example application diagram with cabling

instructions and a caution.

g RS-232 — Connect an RS-232 device (control system or PC) to the 6-pole 3.5 mm

captive screw connector for two-way RS-232 communication. Software for

RS-232 control is included with the MVC. See SIS Programming and Control for

information on how to install and use the control software and SIS commands.

Transmit (Tx)

Receive (Rx)

Ground (Gnd, )

RS-232

21

Tx

Rx

DIGI IN

3

h Digital input (DIGI IN) — A 6-pole 3.5 mm captive screw connector provides three

configurable ports designed to connect to various devices such as motion detectors,

alarms, buttons, photo (light) sensors, temperature sensors, or other devices. This

connector shares a common ground with the RS-232 connector (

g

). The wiring

diagram is shown below.

Do not tin the wires!

1

2

3

_

Digital I/O Wiring

MVC 121 Plus • Installation 7

Both the RS-232 and the digital input connectors may be used simultaneously by using

a 6-pin captive screw connector with two wires sharing the same ground connector

(see the diagram below).

RS-232

DIGI IN

Tx Rx 1 2 3

i Reset — The recessed reset button is used to access various modes of resets. The

green power LED on the front panel indicates what mode of reset was accessed (see

the MVC 121 Plus Hardware Reset Modes section for additional details).

Front Panel Features

VOLUME

CONFIG

MIX

MICMIC LINE

321

MIXER/VOLUME CONTROLLER

MVC 121 Plus

21 3 4 5 6

7

Figure 4. MVC 121 Plus Front Panel

a Power/Reset LED — Green power indicator lights when the MVC 121 Plus is

operational. The LED also blinks per mode reset (see the Reset Actuator and LED

section).

b Configuration (Config) port — Connect a PC to the USB mini B-type connector for

configuring the MVC using the DSP Configurator software. The MVC 121 Plus USB

driver must be installed prior to using the port.

c Mic 1 gain control — Rotating the encoder screw clockwise increases the gain

setting, rotating the encoder screw counterclockwise decreases the gain. This

adjustment controls the single gain point in the mix matrix that mixes mono mic 1

levels to the stereo output bus.

The gain adjustment is indicated by the LED indicator bar (

f

). When the encoder

screw rotation has stopped for three seconds or longer, the LED indicator returns to

the output meter indication.

d Mic 2 gain control — Rotating the encoder screw clockwise increases the gain

setting, rotating the encoder screw counterclockwise decreases the gain setting. This

adjustment controls the single gain point in the mix matrix that mixes mono mic 2

levels to the stereo output bus.

The gain adjustment is indicated by the LED indicator bar (

f

). When the encoder

screw rotation has stopped for three seconds or longer, the LED indicator returns to

the output meter indication.

MVC 121 Plus • Installation 8

e Line level 3 gain control — Rotating the encoder screw clockwise increases the gain

setting, rotating the encoder screw counterclockwise decreases the gain setting. This

adjustment controls the single gain point in the mix matrix that mixes stereo line level

input 3 to the stereo output bus.

The gain adjustment is indicated by the LED indicator bar (

f

). When the encoder

screw rotation has stopped for three seconds or longer, the LED indicator returns to

the output meter indication.

f LED ladder indicator bar — As the mix-point gain or output volume increases or

decreases via the front panel controls, the LED indicator bar lights from the bottom to

the top to indicate the current mix-point or volume level, as shown in the table below.

As the volume is increased or decreased within a volume range, the top LED to be lit

flashes once. If the knob is turned past maximum volume, all 8 LEDs flash for as long

as the knob continues to be turned.

When the output volume is muted, the individual LEDs scroll from the top to the

bottom to indicate a muted state. The LEDs return to being a meter for the output

signal when the audio is unmuted. Unmute occurs when the mute process is reversed,

or when an encoder screw or the volume knob position is changed. All LEDs blink

when the user attempts to adjust the encoder position beyond the maximum gain

level.

When no activity is detected for either the mix-point encoder screws or the volume

adjust knob, the LED indicator bar will reflect a combined L/R output meter level,

where the max level of either left or right meter is always displayed, as shown in the

table below.

NOTE: Mix-point or volume level is only displayed on the LED ladder indicator

whenever the front panel encoder screws or the volume adjustment knob

are being adjusted and not through DSP Configurator software or SIS

commands.

LED Level Meter Display

(dB)

8 -6 to 0

7 -12 to -7

6 -18 to -13

5 -24 to -19

4 -30 to -25

3 -36 to -31

2 -42 to -37

1 -60 to -43

MVC 121 Plus • Installation 9

g Volume level adjust knob — Rotating the adjustment knob clockwise increases the

output volume, rotating the knob counterclockwise decreases the volume. The LEDs

light from bottom up as the volume level increases.

VOLUME

MIXER/VOLUME CONTROLLER

MVC 121 Plus

Use the rotary encoder to adjust the output volume from 0 (-100 dB) to 100% (0 dB).

The default setting is 100% (0 dB). The knob step adjustments are as follows:

Volume

Range (dB)

Knob Step

Adjustment

(dB)

-100 to -70 +/- 5 dB

-70 to -30 +/- 3 dB

-30 to -20 +/- 2 dB

-20 to -0 +/- 1 dB

The degree to which the volume is incremented or decremented for each step the

volume adjust knob is turned, depends on the current volume setting.

As the volume increases or decreases, the LED bar lights to indicate the current

volume range, as shown in the table below. As the volume is increased or decreased

within a volume range, the top LED to be lit flashes once. If the knob is turned past

maximum volume, all 8 LEDs flash, for as long as the knob continues to be turned.

In the table below, turning the volume adjust knob (

g

) affects the volume range and

turning the input gain control screws (

c

,

d

,

e

affects the mix-point range).

LED

Level

Volume Range

(dB)

Mix-point

Range (dB)

8 -4 to -0 +7 to +12

7 -9 to -5 +1 to +6

6 -14 to -10 -3 to +0

5 -19 to -15 -7 to -4

4 -29 to -20 -11 to -8

3 -49 to -30 -15 to -12

2 -69 to -50 -19 to -16

1 -99 to -70 -23 to -20

MVC 121 Plus • Installation 10

Operation

This section describes the operation of the MVC 121 Plus, including:

• MVC 121 Plus Operation

• DSP Processing/Signal Flow

• Filter Processor Block

• Mic/Line Input Signal Chain

• Mixer

• Output Channels

MVC 121 Plus Operation

The MVC 121 Plus can be configured using a PC running Windows XP or better and the

DSP Configurator software (available on the included disc or at www.extron.com), or the

Extron SIS Simple Instruction Set using HyperTerminal or DataViewer.

The MVC 121 Plus is configured for immediate operation, with all inputs mixed to the

outputs. However, input gain must be set, especially for the microphone inputs, before the

device will function at optimal levels.

The front panel small rotary encoders control level at the mix-points, not at the input gain

stage. Mix-points have a gain range of −24 dB to +12 dB. In some instances, the mix-point

gain range may be too great, allowing for settings that are too loud or too soft, and in

some instances the loudest settings may cause feedback or clipping. Soft limits can be

applied to the mix-point gain ranges, limiting the gain range for smoother operation.

Mix-point levels and Variable output levels may be set using the front panel rotary

controls. Input gain should be set using the DSP Configurator software, which provides

metering in dBFS that will assist you in configuring the device for optimal operation. The

MVC 121 Plus is a digital device, therefore optimal operating levels are close to 0 dBFS

without ever going over 0 dBFS (0 dB “full scale” on the input or output meters). Levels

above 0 dBFS cause clipping, which is always audible on a digital device.

Soft limits may also be applied to the Variable output, which will prevent the volume from

becoming too loud or too soft. The Fixed output, while not affected by the front panel

Volume control, does include a gain stage that is configured with the DSP Configurator

software. The Fixed output gain setting can be used to optimize the level going to, for

example, a recording device or ALS system.

Lastly, the input signal chain provides a Filter/EQ block. Use these processors to optimize

the tonal quality of your source devices. A high-pass filter applied to a microphone will

reduce thumps and pops, while the parametric EQ can be used to give a talker more

presence, or to remove frequencies that are likely to cause feedback.

MVC 121 Plus • Operation 11

Front Panel Operation

VOLUME

CONFIG

MIX

MICMIC LINE

321

MIXER/VOLUME CONTROLLER

MVC 121 Plus

21 3 4 5 6

7

Figure 5. MVC 121 Plus Front Panel

a

Power/Reset LED — Green power indicator lights solid when the MVC is

operational. The LED will blink when the reset button is pressed.

b

Configuration connector — The USB 2.0 port uses a mini type-B connector to

connect to a host computer for control. The MVC 121 Plus USB driver must be

installed prior to using the port (see the Install the USB Driver section for additional

information).

The MVC appears as a USB peripheral with bidirectional communication. The USB

connection can be used for software operation (see Windows-based Program

Control), and SIS control (see the Software Control section for additional

information).

Rear Panel Operation

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

Figure 6. MVC 121 Plus Rear Panel

a b c d e f g h

— See the

Rear Panel Features section for further details.

i Reset — The reset actuator initiates system resets (see the Reset Actuator and LED

section for additional information).

MVC 121 Plus • Operation 12

Power Cycle

Current mixing and audio processor settings, the current state of the device, are saved in

nonvolatile memory. When the unit is powered off, all settings are retained. When the unit

is powered back on, it recalls settings from the nonvolatile memory. If a configuration was

in process during the power down, these saved mix, audio level, and audio DSP processor

settings become active.

On power up the front power indicator LED lights solid when the unit is available for

operation or programming.

Firmware Updates

The firmware of the MVC 121 Plus can be updated through USB or RS-232 connection.

The user can obtain new firmware from the Extron website. After obtaining the new

firmware, upload it to the unit by launching Firmware Loader from the DSP Configurator

program (see the Software Control section), or using the Extron standalone Firmware

Loader software application available on the included disc or at www.extron.com.

Reset Actuator and LED

A recessed button on the rear panel initiates two reset modes. The green front panel

LED (

b

) blinks to indicate the reset modes as described in the following section. See the

previous front and rear panel diagrams.

Hardware Reset Modes:

With power on, when the reset button is held down the front and rear panel LEDs

will pulse (blink) every three seconds and put the unit in a different reset mode. The

MVC 121 Plus will default back to the base firmware that shipped with the unit from the

factory allowing the user to recover a unit that has incorrect code or updated firmware

running.

NOTE: Control software may not function correctly if using an earlier firmware

version.

MODE 1 — Firmware reset:

Disconnect power to the MVC 121 Plus. Press and hold the

reset button while applying power to return the firmware to the version shipped with the

unit from the factory. This allows recovering a unit with incorrect or corrupt firmware.

All user files and settings are maintained.

MODE 5 — Factory default reset: With power on, press and hold the reset button until

the reset LED blinks 3 times (~9 seconds). Each flash will last for 0.25 seconds. Release

then momentarily (<1 second) press the reset button to return the MVC to factory default

conditions. If the second momentary press does not occur within 1 second, the reset is

exited.

The default (reset) state of the device is:

• Inputs 1 – 3 are mixed to fixed and variable outputs (set to 0 dB gain).

• All outputs are active (unmuted, 100% volume or 0 dB gain).

• DSP (Filter) is inactive.

• All audio inputs are active (0 dB gain and unmuted).

MVC 121 Plus • Operation 13

Digital Input Port

The three-pin digital input port (Digi In) is used to monitor or drive TTL level digital signals.

The port consists of three input pins with the fourth pin being used as a ground providing

three inputs total. The DSP Configurator software provides a selection of functions from a

list, to be loaded to the MVC 121 Plus.

NOTE: The digital input connectors are used to mute or unmute the input signal using

a contact closure device. SIS programming commands cannot mute or unmute

the input signal while the digital input ports are connected. The digital input

ports are “off” and not configured by default.

1. From the main structure menu, click Tools > Configure Digital Inputs to access the

Config utility.

2. Select the digital input to configure.

MVC 121 Plus • Operation 14

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