Sonifex Redbox RB-MTV1 Instruction Manual

Redbox RB-MTV1
Contribution Voiceover
Monitor With Talkback
User Handbook

bRedbox RB-MTV1 User Handbook
This handbook is for use with the following product:
Redbox RB-MTV1 Contribution Voiceover Monitor With Talkback
©Sonifex Ltd, 2009
All Rights Reserved
Revision 1.01, January 2009
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel: [phone]
Fax: [phone]
Email: [email protected].uk
Website: http://www.sonifex.co.uk
Information in this document is subject to change without notice and does not represent a commitment on the part of
the vendor. Sonifex Ltd shall not be liable for any loss or damage whatsoever arising from the use of information or any
error contained in this manual.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical,
including photocopying, recording, information storage and retrieval systems, for any purpose other than the purchaser’s
personal use, without the express written permission of Sonifex Ltd. Unless otherwise noted, all names of companies,
products and persons contained herein are part of a completely ctitious adaptation and are designed solely to
document the use of Sonifex product.
RB-MTV1 USER HANDBOOK
RB-MTV1 USER HANDBOOK

Redbox RB-MTV1 User Handbook c
CONTENTS
CONTENTS
Warranty i
Warranty and Liability i
Unpacking the RB-MTV1 iii
Returning the Warranty Card iii
Safety Information iv
Safety of Mains Operated Equipment iv
Voltage Setting Checks iv
Fuse Rating iv
Power Cable and Connection iv
Ordering the Correct Mains Lead v
Installation Information v
Atmosphere v
Electromagnetic Radiation v
Fitting Redboxes v
WEEE & RoHS Directives - Sonifex Statement vi
RB-MTV1 Contribution Voiceover Monitor With Talkback 1
Introduction 1
System Block Diagram 2
Front Panel Controls & Indicators 3
MIC Button 3
LED Meter 3
Limit LED 3
TALK Button 3
Headphone Level Controls 3
Headphone Output 3
Rear Panel Connections & Operation 4
Headphone Output 4
Output 2 With Mic/Line Switch 4
Output 1 With Mic/Line Switch 4
Limiter On/O Switch 5
Limiter Level Control 5
Mic Input Gain Control 5
Microphone Input 6
Remote Inputs & Outputs 6
DIPSwitch Conguration Settings (Rear Panel) 6
Microphone Options 6
Switching Options 7
Metering Option 7
Remote Option 7
Output Option 7
DIP Switch Settings (On The Underside Of The Unit)
For Headphone Channel Mix Options 7
Technical Specication For RB-MTV1 8

dRedbox RB-MTV1 User Handbook
FIGURES & TABLES
FIGURES & TABLES
Figures
Fig A: Packing List iii
Fig B: Power Connections iv
Fig C: Mains Lead Table v
Fig D: RB-RK3 Large Redbox Rear Rack-mount Kit v
Fig 1: RB-MTV1 Front Panel 1
Fig 2: RB-MTV1 Block Diagram 2
Fig 3: MIC Button 3
Fig 4: LED Meter 3
Fig 5: Limit LED 3
Fig 6: TALK Button 3
Fig 7: Headphone Level Controls 3
Fig 8: RB-MTV1 Rear Panel Connections 4
Table A: Rear Panel DIPSwitch Conguration Settings 6
Fig 9: Underside of RB-MTV1 Showing Headphone Channel Mix DIPSwitches 7
Table B: Underside DIPSwitch Settings For Headphone Channel Mix Options 8

Redbox RB-MTV1 User Handbook i
Warranty
Warranty and Liability
Important: the purchaser is advised to read this clause
(a) The Company agrees to repair or (at its discretion) replace Goods which are found to
be defective (fair wear and tear excepted) and which are returned to the Company
within 12 months of the date of despatch provided that each of the following
are satised:
(i) notication of any defect is given to the Company immediately upon its
becoming apparent to the Purchaser;
(ii) the Goods have only been operated under normal operating conditions and
have only been subject to normal use (and in particular the Goods must have
been correctly connected and must not have been subject to high voltage or
to ionising radiation and must not have been used contrary to the Company’s
technical recommendations);
(iii) the Goods are returned to the Company’s premises at the Purchaser’s expense;
(iv) any Goods or parts of Goods replaced shall become the property of
the Company;
(v) no work whatsoever (other than normal and proper maintenance) has been
carried out to the Goods or any part of the Goods without the Company’s prior
written consent;
(vi) the defect has not arisen from a design made, furnished or specied by
the Purchaser;
(vii) the Goods have been assembled or incorporated into other goods only in
accordance with any instructions issued by the Company;
(viii) the defect has not arisen from a design modied by the Purchaser;
(ix) the defect has not arisen from an item manufactured by a person other than
the Company.
In respect of any item manufactured by a person other than the Company, the Purchaser
shall only be entitled to the benet of any warranty or guarantee provided by such
manufacturer to the Company.
(b) In respect of computer software supplied by the Company the Company does not
warrant that the use of the software will be uninterrupted or error free.
WARRANTY
WARRANTY

ii Redbox RB-MTV1 User Handbook
(c) The Company accepts liability:
(i) for death or personal injury to the extent that it results from the negligence of
the Company, its employees (whilst in the course of their employment) or its
agents (in the course of the agency);
(ii) for any breach by the Company of any statutory undertaking as to title, quiet
possession and freedom from encumbrance.
(d) Subject to conditions (a) and (c) from the time of despatch of the Goods from the
Company’s premises the Purchaser shall be responsible for any defect in the Goods
or loss, damage, nuisance or interference whatsoever consequential economic or
otherwise or wastage of material resulting from or caused by or to the Goods. In
particular the Company shall not be liable for any loss of prots or other economic
losses. The Company accordingly excludes all liability for the same.
(e) At the request and expense of the Purchaser the Company will test the Goods to
ascertain performance levels and provide a report of the results of that test. The
report will be accurate at the time of the test, to the best of the belief and knowledge
of the Company, and the Company accepts no liability in respect of its accuracy
beyond that set out in Condition (a).
(f) Subject to Condition (e) no representation, condition, warranty or other term,
express or implied (by statute or otherwise) is given by the Company that the Goods
are of any particular quality or standard or will enable the Purchaser to attain any
particular performance or result, or will be suitable for any particular purpose or use
under specic conditions or will provide any particular capacity, notwithstanding
that the requirement for such performance, result or capacity or that such particular
purpose or conditions may have been known (or ought to have been known) to the
Company, its employees or agents.
(g) (i) To the extent that the Company is held legally liable to the Purchaser for any
single breach of contract, tort, representation or other act or default, the
Company’s liability for the same shall not exceed the Price of the Goods.
(ii) The restriction of liability in Condition (g)(i) shall not apply to any liability
accepted by the Seller in Condition (c).
(h) Where the Goods are sold under a consumer transaction (as dened by the
Consumer Transactions (Restrictions on Statements) Order 1976) the statutory
rights of the Purchaser are not aected by these Conditions of Sale.
WARRANTY
WARRANTY

Redbox RB-MTV1 User Handbook iii
Unpacking the RB-MTV1
The RB-MTV1 is shipped with the following equipment. Please check your packaging to
ensure that you have all of the items below. If anything is missing, please contact the
supplier of your equipment immediately.
Item Quantity RB-MTV1
RB-MTV1 1
IEC Mains lead tted with moulded mains plug 1
Handbook and warranty card 1
Fig A: Packing List
Each RB-MTV1 is shipped in protective packaging and should be inspected for damage
before use. Where an item is found to have transit damage, notify the carrier immediately
with all the relevant details of the shipment. Packing materials should be kept for
inspection and also for if the product needs to be returned.
Returning the Warranty Card
In order to register the date of purchase so that we can keep you informed of any design
improvements or modications, it is important to complete the warranty registration
document that is enclosed and return it to Sonifex Ltd in the UK.
For your own records you should write down the serial number (which can be found on the
rear of the RB-MTV1.
Serial Number ………………………………………
WARRANTY
WARRANTY

iv Redbox RB-MTV1 User Handbook
Safety Information
Safety of Mains Operated Equipment
This equipment has been designed to meet the safety regulations currently
advised in the country of purchase and it conforms to the safety regulations
specied by use of the CE Mark.
Warning : There are no user serviceable parts inside the equipment. If you should ever
need to look inside the unit, always disconnect the mains supply before removing the
equipment covers.
Voltage Setting Checks
Ensure that the machine operating voltage is correct for your mains power supply by
checking the box in which your Redbox was supplied. The voltage is shown on the box
label. The available voltage settings are 115V, or 230V. Please note that all Redboxes are
either switchable between 115V and 230V, or have a universal power supply.
Fuse Rating
The RB-MTV1 is supplied with a single fuse in the live conducting path of the mains
power input. For reasons of safety it is important that the correct rating and type of fuse is
used. Incorrectly rated fuses could present a possible re hazard, under equipment fault
conditions. The fuse rating for the RB-MTV1 is:
230V operation 100mA, 5 x 20mm SB
115 V operation 200mA, 5 x 20mm SB
The active fuse is tted on the outside rear panel of the unit.
Power Cable and Connection
An IEC power connector is supplied with the RB-MTV1 which has a moulded plug attached
– this is a legal requirement. If no moulded plug has been supplied with your RB-MTV1,
please contact your supplier, because an IEC connector is always supplied from the Sonifex
factory.
If for any reason, you need to use the RB-MTV1 with a dierent power cable, you should
use the following wiring guidelines.
Wire Colour Connection
Green, or green and yellow Earth (E)
Blue, or Black Neutral (N)
Brown, or Red Live (L)
Fig B: Power Connections
Connect the equipment in accordance with the connection details and before applying
power to the unit, check that the machine has the correct operating voltage for your mains
power supply.
SAFETY & INSTALLATION
INFORMATION
SAFETY & INSTALLATION INFORMATION

Redbox RB-MTV1 User Handbook v
Ordering the Correct Mains Lead
When ordering a Redbox from Sonifex, it is helpful if you can specify your required
operating voltage and mains lead. After the product code add:
UK, for 230V, UK 3 pin to IEC lead
EC, for 230V, European Schuko 2 pin to IEC lead
US, for 115V, 3 pin to IEC lead
AU for 230V, Australasian 3 pin to IEC lead
Fig C: Mains Lead Table
E.g. order RB-MTV1 UK for a UK IEC lead to be supplied.
Installation Information
Atmosphere
The units should be installed in an area that is not subject to excessive temperature
variation (<0°C, >50°C), moisture, dust or vibration.
Electromagnetic Radiation
The cover is connected to earth by means of the xing screws. It is essential to maintain
this earth ground connection to ensure a safe operating environment and provide
electromagnetic shielding.
Fitting Redboxes
Redboxes can be xed to the underside of a mixing desk, or other surfaces using 4.2mm
holes in the sides and xed with 2 x M4 screws or 2 x No. 6 countersink wood screws.
They can also be rack-mounted, with either the front, or rear of the Redbox positioned at
the front of the rack:
Rear Mounting The RB-MTV1: The RB-RK3 1U rear panel rack kit can be used for large
Redboxes such as the RB-MTV1.
Fig D: RB-RK3 Large Redbox Rear Rack-mount Kit
Note: When tting the rear-mounting rack-kits, a notch has been left on the inside of
the right-hand rack-piece for the mains cable to pass through. Make sure that the mains
cable has been put through the notch before attaching the right hand rack-piece.
SAFETY & INSTALLATION
INFORMATION
SAFETY & INSTALLATION INFORMATION

vi Redbox RB-MTV1 User Handbook
WEEE & RoHS Directives - Sonifex Statement
The Waste Electrical and Electronic Equipment (WEEE) Directive was agreed on
13 February 2003, along with the related Directive 2002/95/EC on Restrictions
of the use of certain Hazardous Substances in electrical and electronic
equipment (RoHS).
The Waste Electrical and Electronic Equipment Directive (WEEE) aims to minimise the
impacts of electrical and electronic equipment on the environment during their life times
and when they become waste. It applies to a huge spectrum of products. It encourages
and sets criteria for the collection, treatment, recycling and recovery of waste electrical and
electronic equipment. All products manufactured by Sonifex Ltd have the WEEE directive
label placed on the case. It gives a contact for individuals who are unsure about the correct
procedure when the product has reached its “end of use”.
Sonifex Ltd will be happy to give you information about local organisations that can
reprocess the products, or alternatively all products that have reached “end of use” can be
returned to Sonifex and will be reprocessed correctly free of charge.
Sonifex Ltd has phased out the use of certain hazardous substances identied in the
European Union’s Restriction of Hazardous Substances (RoHS) directive. The RoHS
directive limits the use of certain hazardous substances currently used in EEE manufacture,
including lead, mercury, cadmium, hexavalent chromium, and halide-containing
compounds PBB (polybrominated biphenyl) and PBDE (polybrominated diphenyl ether).
Elimination of these substances will result in more environmentally friendly recycling
of electronic equipment. For the products which Sonifex manufacture, the main area
where products were aected was in the use of lead for manufacturing and assembling
electronics circuit boards.
Sonifex Ltd practices lead-free (LF) manufacturing processes. LF solder is used on the
surface-mount PCB manufacturing processes and for hand soldering. The printed circuit
boards (PCBs) used are either gold plated, or immersion tin plated, both of which use no
lead. Historically the PCBs were hot air solder levelled (HASL) PCBs which used tin/lead
based solder.
The manufacturing processes include the assembly of purchased components from
various sources. Product is oered as RoHS compliant, or LF, only after sucient evidence
is received from the component manufacturers that their components are RoHS compliant.
Sonifex Ltd relies solely on the distributor, or manufacturer, of the components for
identication of RoHS compliance. Thus whilst every eort is made to ensure compliance,
Sonifex Ltd makes no warranty, or certication, or declaration of compliance concerning
said components.
Sonifex Ltd denes“Lead Free” as pertaining to any product, which has been manufactured
by Sonifex Ltd using components which have been declared by the manufacturers as
“Lead Free”. All statements by Sonifex Ltd of RoHS compliance are based on component
manufacturer documentation.
SAFETY & INSTALLATION
INFORMATION
SAFETY & INSTALLATION INFORMATION

Redbox RB-MTV1 User Handbook 1
INTRODUCTION 1
INTRODUCTION
RB-MTV1 Contribution Voiceover Monitor With Talkback
Introduction
Fig 1: RB-MTV1 Front Panel
The RB-MTV1 contribution voiceover monitor is a 1U rack-mount designed to be used in
voice-over booths, news booths, commentary locations, for continuity announcements and
for any other similar applications where voice needs to be added to programme content
and then monitored. Programme feeds, auxiliary feeds and a talkback feed can be taken in
and monitored.
The RB-MTV1 has a microphone input, two main mono outputs, two external stereo
monitoring inputs plus a 4-wire. It has a mono microphone input on XLR with switched
coarse gain and variable ne gain control using a multi-turn preset potentiometer to
give an overall gain range from +20dB to +80dB. There is also a switched LF rumble lter,
switched +48V phantom power and switched level limiting control. A rear-panel multi-turn
preset potentiometer allows adjustment of the threshold at which the limiter begins to
operate, from -8dBu to +26dBu. There is an indication of the limiter activity using a blue
LED and the microphone level is monitored by a simple 5 LED meter. The meter can be
congured to either show the MIC signal activity in normal operation, i.e. when TALK is
pressed the meter is o, or the meters can permanently show the MIC activity even when
the TALK button is on or the MIC button is o.
There is a mono balanced TALKBACK input on XLR. There are two balanced XLR stereo
inputs, CUE and programme (PGM) each with a 10dB input gain switch to facilitate the use
of unbalanced sources such as from PC audio cards, domestic CD players, etc.
Each of these inputs, MIC, TALKBACK, CUE and PGM can be mixed and monitored in the
front and rear headphone outputs with individual volume controls. Which of the inputs is
presented to the headphone outputs can be congured using two banks of DIPswitches
on the underside of the unit, one bank for audio that is heard in the left ear piece and one
bank for audio monitored in the right ear piece. For example, the left and right PGM inputs
can be sent to the right ear-piece and all other signals to the left ear-piece, or the TALK
signal could be sent to the right ear-piece and all other signals to both ear-pieces. In this
way, you can congure the unit for your particular application on installation. If a presenter
doesn’t like to hear themselves in their headphones when using the TALK button, there is
also a DIPswitch option to mute the mic signal to the headphones.
LED
Meter
TALK
Button
Headphone
Output
MIC
Button
Power
LED
Headphone Volume Controls
MIC TALK
BACK
CUE PGM
LIMIT
LED

2Redbox RB-MTV1 User Handbook
INTRODUCTION
1
INTRODUCTION
There are two mono balanced outputs. The processed microphone signal is fed to the
two outputs when the electronically latching front panel MIC button is active - the button
illuminates when active.
The two main outputs can be independently switched to be at ‘Line’ or ‘Mic’ level outputs
using rear panel push switches. Setting the output to a microphone level allows the unit
to be inserted into the microphone channel of a mixer. There is an option to permanently
enable the MIC button, even when remotely controlled, for occasions when you always
want the MIC channel left open. Additionally, there is an option to mix the CUE input as a
mono feed to the outputs permanently.
The front panel TALK button is a momentary push switch that routes the processed
microphone signal to the “LAZY”TALK output, whilst disconnecting it from the main
outputs, allowing the operator to talk to a colleague. This enables the unit to be used as a
talkback intercom between two or more studios.
There is a rear panel remotes connector giving remote control of the two front panel MIC
and TALK buttons and opto-isolated tallies of their status.
A red LED on the front panel of the unit indicates when power is present.
System Block Diagram
Fig 2: RB-MTV1 Block Diagram
Mic
Input
T/B
Input
Cue
PGM
L
R
R
L
Remotes
+48V Mic Gain
Mic Limit
Limit LED
LF
Filter
+20dB
Gain
On
Off
Lazy
Output
Output 1
Output 2
Headphone
Front
Right
Headphone
Mix
Left
Headphone
Mix
Headphone
Rear
Mic Meter
Mic/
Line
Mic/
Line
+10dB
+10dB

Redbox RB-MTV1 User Handbook 3
2
FRONT PANEL CONTROLS & INDICATORS
FRONT PANEL CONTROLS & INDICATORS
Front Panel Controls & Indicators
MIC Button
This is an illuminated electronically latching push switch that
routes microphone audio to outputs 1 and 2, provided that
the TALK button is not also pressed. The button illuminates
red when the MIC function is active. Push the button again to
unlatch it.
LED Meter
This is a 5 way LED meter with the following level indicators:
-12dB (green), -6dB (green), 0dB (yellow), +3dB (yelow), +6dB
(red). The LED meter source is selected by the back panel dip
switch.
Limit LED
This 3mm blue LED illuminates when the limiter circuit is
operating. A rear-panel multi-turn preset potentiometer allows
adjustment of the threshold at which the limiter begins to
operate, from -8dBu to +26dBu.
TALK Button
The TALK button is a momentary push switch that routes mic
audio to the lazy talkback output, whilst disconnecting it from
the main outputs, allowing the operator to talk to a colleague.
The button illuminates green when the TALK function is active.
Headphone Level Controls
There are four volume control knobs,
one for each of the audio sources
MIC, TALKBACK, CUE and PGM, that
determine the level of each audio
source that is mixed into the front
and rear panel headphone outputs.
As well as being able to alter the volume of the sources presented to the headphones,
using DIPswitches on the underside, the RB-MTV1 can be congured to alter which of the
inputs is presented to the headphone outputs, to enable customization of the unit for your
monitoring application.
Headphone Output
The front panel headphone output is a 1/4”(6.35mm) jack socket and is a parallel
connection of that on the rear, designed to drive 150mW into 32Ω to 600Ω
professional headphones.
Fig 3: MIC Button
Fig 4: LED Meter
Fig 5: Limit LED
Fig 6: TALK Button
Fig 7: Headphone Level Controls

4Redbox RB-MTV1 User Handbook
3REAR PANEL CONTROLS & INDICATORS
REAR PANEL CONTROLS & INDICATORS
Rear Panel Connections & Operation
Fig 8: RB-MTV1 Rear Panel Connections
Headphone Output
The rear panel headphone output is a 1/4” (6.35mm) jack socket and is a parallel connection
of that on the front, designed to drive 150mW into 32Ω to 600Ω professional headphones.
Output 2 With Mic/Line Switch
The XLR 3 pin plug used for the mono mic/line output is electronically balanced and has an
output impedance of <50Ω bridging in line mode and 100Ω nominal in mic mode. The XLR
has the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
Depressing the MIC/LINE button converts the output to a mic level and impedance for
insertion into a mic channel. The default state for this output is LINE.
Output 1 With Mic/Line Switch
The XLR 3 pin plug used for the mono mic/line output is electronically balanced and has an
output impedance of <50Ω bridging in line mode and 100Ω nominal in mic mode. The XLR
has the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
Depressing the MIC/LINE button converts the output to a mic level and impedance for
insertion into a mic channel. The default state for this output is LINE.
TALKBACK (LAZY) Output
The XLR 3 pin plug used for the mono lazy talkback output is electronically balanced and
has an impedance of <50Ω bridging. The XLR has the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
This output is activated by pressing the “TALK”button on the front panel and is intended to
be used as a talkback intercom between two units.
TALKBACK
Input
Headphone
Output
Output 2
With
Mic/Line
Switch
Output 1
With
Mic/Line
Switch
TALKBACK
(Lazy Output)
PGM Input
With
+10dB Pad
CUE Input
With
+10dB Pad MIC
Input
Limiter
On/O
MIC
Input
Gain
Limit
Level
Remotes
Settings
DIP
Switches

Redbox RB-MTV1 User Handbook 5
3
REAR PANEL CONTROLS & INDICATORS
REAR PANEL CONTROLS & INDICATORS
TALKBACK Input
The mono talkback line level input is electronicallly balanced and is routed directly to
the TALKBACK headphone level control on the front panel, to adjust the mix into the
headphones.The XLR socket has the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
PGM Inputs (Left and Right) With 10dB Pad
The left and right PGM inputs are electronically balanced line level inputs with an
impedance of >20kΩ and a gain boost switch (+10dB) for use with equipment at domestic
audio levels. The XLR sockets have the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
The PGM audio is routed directly to the PGM headphone level control on the front panel, to
adjust the mix into the headphones.
CUE Inputs (Left and Right) With 10dB Pad
The left and right CUE inputs are electronically balanced line level inputs with an
impedance of >20kΩ and a gain boost switch (+10dB) for use with semi-pro equipment at
lower audio levels. The XLR sockets have the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
The CUE audio is routed directly to the CUE headphone level control on the front panel,
to adjust the mix into the headphones. It can also be mono mixed to the 2 main outputs
using DIPSwitch 8 on the rear panel.
Limiter On/O Switch
This is a latching push switch to switch the microphone limiter on or o. The default
position for this switch is o.
Limiter Level Control
The limit level control is a multi-turn preset potentiometer to set the maximum output
level when the limiter is enabled. The level can be set between -8dBu and +26dBu and as
standard is set at +8dBu.
Mic Input Gain Control
This is a multi-turn preset potentiometer to adjust the gain of the microphone input. The
gain ranges from +20dB to +80dB when used with DIPSwitch 1 on the rear panel.

6Redbox RB-MTV1 User Handbook
3REAR PANEL CONTROLS & INDICATORS
REAR PANEL CONTROLS & INDICATORS
Microphone Input
The microphone input is an electronically balanced mono mic level input that is routed
directly to the MIC headphone level control on the front panel, to adjust the mix into the
headphones. The microphone audio appears on the two main outputs whenever the
electronically latching MIC button has been pressed and illuminated. The microphone
signal is switchable on to the‘lazy’ talkback output by pressing the TALK button. The XLR
socket has the following connections:
Pin 1: Screen.
Pin 2: Phase.
Pin 3: Non-phase.
Remote Inputs & Outputs
The 9-way ‘D’ type socket oers the following connections:
Pin 1: Remote Mic switch input (make to common pin 6).
Pin 2: Mic indicator opto-coupled NPN collector output.
Pin 3: Talk switch (make to common pin 8)
Pin 4: Talk indicator opto-coupled NPN collector output.
Pin 5: +5V feed @ 0.2A maximum.
Pin 6: Mic common 0V.
Pin 7: Mic indicator opto-coupled NPN emitter output.
Pin 8: Talk common 0V.
Pin 9: Talk indicator opto-coupled NPN emitter output.
DIPSwitch Conguration Settings (Rear Panel)
DIPSwitch
Setting No Function When DIPSwitch is ON Default Setting
1Plus 20dB Mic Gain. OFF
2LF Filter O. ON
3Phantom Power On. OFF
4Mic Mute in Headphones On Talk. OFF
5Enable Permanent Mic On. OFF
6Mic Meter Permanent. OFF
7Latched Remote Input on Mic Switch. ON
8Mono Mix of Cue Input to Mono Outputs. OFF
Table A: Rear Panel DIPSwitch Conguration Settings
Microphone Options
Options are available to add phantom power at +48V to the microphone input (DIPSwitch
3 ON), switch a low frequency rumble lter in (DIPSwitch 3 OFF) and to add an additional
20dB of gain to the microphone input: The microphone gain range is adjustable from
+20dB to +80dB and this is done as +20dB to +60dB via the MIC GAIN rotary potentiometer
with DIPSwitch 1 OFF, or +40dB to +80dB via rotary potentiometer with DIPSwitch 1 ON.

Redbox RB-MTV1 User Handbook 7
3
REAR PANEL CONTROLS & INDICATORS
REAR PANEL CONTROLS & INDICATORS
Switching Options
TALK button - On pressing the TALK button, set DIPSwitch 4 to ON to mute the microphone
signal to the headphones, for the situation where you are using talkback and don’t want to
hear your own voice in the headphones.
MIC button - The MIC button can be permanently latched, i.e. always on, by setting
DIPSwitch 5 to ON. In this mode, the microphone can not be switched o or remotely
switched o, but all other operation is normal, for example, pressing the TALK button
mutes the mirophone to the Outputs 1 and 2. This is useful in situations where you need
to leave the unit unattended and want to ensure that the microphone is always on, e.g. for
covert operations, or where the operator may be unfamiliar with the unit’s operation.
Metering Option
The meter can be made to permanently show the level of the MIC input. With DIPSwitch 6
set to OFF, the metering is disabled whilst the TALK button is pressed. With DIPSwitch 6 set
to ON, the metering permanently shows the microphone input level.
Remote Option
The Remote Mic switch input (Pin 1 of the Remotes) can be controlled by a latching
or momentary switch. With DIPSwitch 7 OFF, a momentary switch will operate it. With
DIPSwitch 7 ON, the remote switch needs to be a latching type.
Output Option
By setting DIPSwitch 8 to ON, the CUE stereo input can be mono mixed to Outputs 1 and 2.
DIP Switch Settings (On The Underside Of The Unit)
For Headphone Channel Mix Options
The DIPSwitches on the underside of the unit can be used to dene which of the sources
(MIC, TALKBACK, PGM and CUE) are sent to which side of the headphone output (left or
right).. There are two sets of switches; the ones on the left represent the left earpiece of the
headphones, the right switches represent the right earpiece. Setting the DIPSwitch to ON
enables the selected source to the selected earpiece.
Fig 9: Underside of RB-MTV1 Showing Headphone Channel Mix DIPSwitches
MICROPHONEMICROPHONE
PGM RIGHT
PGM LEFT
CUE LEFT
CUE RIGHT
TALKBACK
PGM RIGHT
PGM LEFT
CUE LEFT
CUE RIGHT
TALKBACK
HEADPHONE CHANNEL MIX
LEFT RIGHT
1
2
3
5
4
8
7
6
ON
ON
1
ON DIP
2345678
1
ON DIP
2345678
MICROPHONEMICROPHONE
PGM RIGHT
PGM LEFT
CUE LEFT
CUE RIGHT
TALKBACK
PGM RIGHT
PGM LEFT
CUE LEFT
CUE RIGHT
TALKBACK
HEADPHONE CHANNEL MIX
LEFT RIGHT
1
2
3
5
4
8
7
6
ON
ON
1
ON DIP
2345678
1
ON DIP
2345678

8Redbox RB-MTV1 User Handbook
4TECHNICAL SPECIFICATION
TECHNICAL SPECIFICATION
DIPSwitch
Setting No Source/Input
Default
Setting
(Left SW8)
Default
Setting
(Right SW9)
1Microphone ON ON
2Talkback ON ON
3Cue Left ON OFF
4Cue Right OFF ON
5PGM Left ON OFF
6PGN Right OFF ON
7 - N/A N/A
8 - N/A N/A
Table B: Underside DIPSwitch Settings For Headphone Channel Mix Options
Technical Specication For RB-MTV1
Input Impedance: 2kΩ nominal balanced MIC input
>20kΩ all other inputs.
Maximum Input Level: -10dBu MIC input
+26dBu TALK, CUE & PGM inputs
Mic Gain Range: Adjustable +20dB to +80dB:
+20dB to +60dB with Settings DIPSwitch 1 OFF
+40dB to +80dB with Settings DIPSwitch 1 ON
E.I.N.: 130dB
Common Mode Rejection: >60dB typically
Low Frequency Roll-O: 125Hz @ 6dB/octave
Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Phantom Power: +48V
Limiter Threshold: Adjustable -8dBu to +26dBu
Output Impedance: <50Ω in LINE mode, 100Ω nominal in MIC mode
Maximum Output Level: +26dBu balanced outputs in LINE mode
-18dBu in MIC mode
Headphone Output Level: Drives 150mW into 32Ω to 600Ω headphones
Frequency Response: 20Hz to 20KHz ±0.1dB (ref 1KHz)

Redbox RB-MTV1 User Handbook 9
4
TECHNICAL SPECIFICATION
TECHNICAL SPECIFICATION
Rear Panel Connections
MIC Input: 1 x XLR 3 pin female (Balanced)
TALKBACK Input: 1 x XLR 3 pin female (Balanced)
CUE Inputs: 2 x XLR 3 pin female (Balanced)
PGM Inputs: 2 x XLR 3 pin female (Balanced)
Mic/Line Output 1: 1 x XLR 3 pin male (Balanced)
Mic/Line Output 2: 1 x XLR 3 pin male (Balanced)
TALK (LAZY) Output: 1 x XLR 3 pin male (Balanced)
Headphone Outputs: 2 x ¼” (6.35mm) A-gauge 3-pole stereo
jack sockets
Remote I/O Port: 9-way ‘D’-type socket
Mains Input: Filtered IEC, 110V-120V, or
220-240V switchable, fused, 9W maximum
Fuse Rating: Anti-surge fuse 100mA 20 x 5mm (230VAC)
Anti-surge fuse 250mA 20 x 5mm (115VAC)
Equipment Type
RB-MTV1: Contribution Voiceover Unit With Talkback
Physical Specication
Dimensions 48cm (W) x 10.8cm (D) x 4.3cm (H) (Raw):
19” (W) x 4.3” (D) x 1.7” (H) (1U)
Dimensions 59cm (W) x 20.5cm (D) x 6cm (H)
(Boxed): 21” (W) x 8” (D) x 2.4”(H)
Weight : Nett: 1.3kg Gross: 1.9kg
Nett: 2.9lbs Gross: 4.2lbs
Accessories
RB-RK3: 1U Rear panel rack kit for large Redboxes

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