Sonifex Redbox RB-DA6 6 Instruction Manual

Manufacturers of audio & video
products for radio & TV broadcasters
Redbox
User Handbook No 4
HANDBOOK
RB-DA6 6 Way Stereo Distribution Amplifier
RB-DA6G 6 Way Stereo Distribution Amplifier
With Output Gain Control
RB-DA6P 6 Way Stereo Distribution Amplifier
RB-DA6R 6 Way Stereo Distribution Amplifier
With RJ-45 Outputs
RB-DA6RG 6 Way Stereo Distribution
Amplifier With RJ-45 Outputs
RB-DA4x5 4 Input, 4 x 5 Output Distribution
Amplifier/Mixer
RB-DA24MD 24 Way Mono Audio
Distribution Amplifier
RB-DDA6A 6 Way Stereo AES/EBU Digital
Distribution Amplifier
RB-DDA6A3 6 Way Stereo AES3 Digital Audio
Distribution Amplifier
RB-DDA6S 6 Way Stereo S/PDIF Digital Distribution
Amplifier
RB-DDA6A-2P 6 Way Stereo AES/EBU Digital
Distribution Amplifier With Dual Power Supplies
RB-DDA6W 6 Way Word Clock Distribution Amplifier
RB-DDA6W-2P 6 Way Word Clock Distribution Amplifier
With Dual Power Supplies
RB-DDA22 Digital Audio Distribution Amplifier With
Multiple Outputs
RB-AES4B3 Quad 3 Way Passive AES3ID Splitters With
BNC Connectors
RB-AES4X3 Quad 3 Way AES3 Splitter XLR Connectors
RB-MS4X3 Quad 3 Way Microphone Splitter
RB-MSP6 6 Way +48V Phantom Power Supply

Redbox Handbook 4
Redbox User Handbook No 4
Stock Code: 30-341
Artwork: AW10834A
Revision 3.01, December 2017
©Sonifex Ltd, 2017
All Rights Reserved
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel: [phone]
Fax: [phone]
Email: [email protected]o.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 fictitious adaptation and are designed solely to document the use of Sonifex
product.
Made in the UK by
For the latest Sonifex handbook information please visit the
Sonifex website at www.sonifex.co.uk

Contents
Contents
Product Warranty - 2 Year Extended ii
Sonifex Warranty & Liability Terms & Conditions ii
1. Definitions ii
2. Warranty ii
Unpacking Your Product iii
Repairs & Returns iv
Conformity iv
Safety & Installation of Mains Operated Equipment iv
Voltage Setting Checks iv
Fuse Rating iv
Power Cable & Connection iv
WEEE Directive v
Atmosphere/Environment v
Fitting Redboxes v
1 RB-DA6 6 Way Stereo Distribution Amplifier 1
Introduction 1
System Block Diagram 1
Connections and Operation 2
Technical Specifications RB-DA6 3
2 RB-DA6G 6 Way Stereo Distribution Amplifier With
Output Gain Control 4
Introduction 4
System Block Diagram 4
Connections and Operation 5
Technical Specifications RB-DA6G 6
3 RB-DA6P 6 Way Stereo Distribution Amplifier 7
Introduction 7
System Block Diagram 7
Connections and Operation 8
Technical Specifications RB-DA6P 9
4 RB-DA6R 6 Way Stereo Distribution Amplifier
With RJ45 Outputs 10
Introduction 10
Connections and Operation 11
System Block Diagram 11
Technical Specification RB-DA6R 13
5 RB-DA6RG 6 Way Stereo Distribution Amplifier
With RJ45 Outputs 14
Introduction 14
Connections and Operation 15
System Block Diagram 15
Technical Specification RB-DA6RG 17
6 RB-DA4x5 4 Input, 4 x 5 Output Distribution
Amplifier/Mixer 18
Introduction 18
System Block Diagram 19
Rear Panel Connections and Operation 19
Technical Specifications RB-DA4x5 21
7 RB-DA24MD 24 Way Mono Audio Distribution Amplifier 22
Introduction 22
Connections And Operation 23
Technical Specifications RB-DA24MD 25
8 RB-DDA6A 6 Way Stereo AES/EBU Digital Distribution
Amplifier 26
Introduction 26
Rear Panel Connections and Operations 26
System Block Diagram 27
Technical Specifications RB-DDA6A 28
9 RB-DDA6A-2P 6 Way Stereo AES/EBU Digital
Distribution Amplifier With Dual Power Supplies 29
Introduction 29
System Block Diagram 30
Rear Panel Connections and Operations 31
10 RB-DDA6A3 6 Way Stereo AES-3id Digital Audio
Distribution Amplifier 33
Introduction 33
Rear Panel Connections and Operations 33
System Block Diagram 34
Technical Specifications RB-DDA6A3 35
11 RB-DDA6S 6 Way Stereo S/PDIF Digital Distribution
Amplifier 36
Introduction 36
Rear Panel Connections and Operations 36
System Block Diagram 37
Technical Specifications RB-DDA6S 38
12 RB-DDA6W 6 Way Word Clock Distribution Amplifier 39
Introduction 39
Rear Panel Connections and Operations 39
System Block Diagram 40

Contents
Technical Specifications RB-DDA6W 41
13 RB-DDA6W-2P 6 Way Word Clock Distribution
Amplifier With Dual Power Supplies 42
Introduction 42
System Block Diagram 43
Rear Panel Connections and Operations 44
Technical Specification For RB-DDA6W-2P 45
14 RB-DDA22 Digital Audio Distribution Amplifier
With Multiple Outputs 46
Introduction 46
System Block Diagram 47
Rear Panel Connections and Operations 48
Digital Audio Inputs 48
Digital Audio Outputs 48
Technical Specifications RB-DDA22 49
15 RB-AES4B3 Quad 3 Way Passive AES-3id Splitters
With BNC Connectors 50
Introduction 50
Block Diagram 50
Controls & Connectors 51
Technical Specification RB-AES4B3 52
16 RB-AES4X3 Quad 3 Way AES3 Splitter XLR Connectors 53
Introduction 53
Block Diagram 53
Controls & Connectors 54
Technical Specifications RB-AES4X3 55
17 RB-MS4X3 Quad 3 Way Microphone Splitter 56
Introduction 56
Block Diagram 56
Controls & Connectors 57
Front Panel 57
Rear Panel 58
Technical Specifications RB-MS4X3 59
18 RB-MSP6 6 Way +48V Phantom Power Supply 60
Introduction 60
System Block Diagram 60
Connections and Operation
Front Panel Controls and Indicators 61
Rear Panel Connections 61
Technical Specifications RB-MSP6 62

Figures
Figures
Fig A: RB-RK1 Small Redbox Front Rack-mount Kit . v
Fig B: RB-RK2 Small Redbox Rear Rack-mount Kit. vi
Fig C: RB-RK3 Large Redbox Rear Rack-mount Kit. vi
Fig 1-1: RB-DA6 Front Panel. 1
Fig 1-2: RB-DA6 System Block Diagram 1
Fig 1-3: RB-DA6 Rear Panel 2
Fig 2-1: RB-DA6G Front Panel 4
Fig 2-2: RB-DA6G System Block Diagram 4
Fig 2-3: RB-DA6G Rear Panel 5
Fig 3-1: RB-DA6P Front Panel 7
Fig 3-2: RB-DA6P System Block Diagram 7
Fig 3-3: RB-DA6P Rear Panel 8
Fig 3-4: RB-DA6P Phoenix Connectors 8
Fig 4-1: RB-DA6R Front Panel 10
Fig 4-2: RB-DA6R System Block Diagram 11
Fig 4-3: RB-DA6R Rear Panel 11
Fig 4-4: RB-DA6R Input Selector Switch 11
Fig 4-5: RB-DA6R Front Panel Input Gain Controls and
Stereo/Mono Switch 12
Fig 5-1: RB-DA6RG Front Panel 14
Fig 5-2: RB-DA6RG System Block Diagram 15
Fig 5-3: RB-DA6RG Rear Panel 15
Fig 5-4: RB-DA6RG Input Selector Switch 16
Fig 5-5: RB-DA6RG Front Panel Output Gain Controls
and Stereo/Mono Switch 16
Fig 6-1: RB-DA4x5 Front Panel 18
Fig 6-2: RB-DA4x5 System Block Diagram 19
Fig 6-3: RB-DA4x5 Rear Panel 19
Fig 6-4: RB-DA4x5 Audio Output Group15-Way D-Type Plug 20
Fig 6-5: RB-DA4x5 Pinout for Audio Output Group Connector 20
Fig 6-6: RB-DA4x5 Routing Selection Switch 20
Fig 6-7: RB-DA4x5 Routing Selection Switch Functions 20
Fig 7-1: RB-DA24MD Front Panel 22
Fig 7-2: RB-DA24MD System Block Diagram 22
Fig 7-3: RB-DA24MD Rear Panel 23
Fig 7-4: Analogue Input 23
Fig 7-5: 25 Way D-Type Outputs 23
Fig 7-6: 25 Roll Off and Dual Mono/Mixed Operation Switches 24
Fig 8-1: RB-DDA6A Front Panel 26
Fig 8-2: RB-DDA6A Rear panel 26
Fig 8-3: RB-DDA6A System Block Diagram 27
Fig 9-1: RB-DDA6A-2P Front Panel 29
Fig 9-2: RB-DDA6A-2P System Block Diagram 30
Fig 9-3: RB-DDA6A-2P Rear panel 31
Fig 9-4: RB-DDA6A-2P Alarm Connector Diagram 31
Fig 10-1: RB-DDA6A3 Front Panel 33
Fig 10-2: RB-DDA6A3 Rear panel 33
Fig 10-3: RB-DDA6A3 System Block Diagram 34
Fig 11-1: RB-DDA6S Front Panel 36
Fig 11-2: RB-DDA6S Rear panel 36
Fig 11-3: RB-DDA6S System Block Diagram 37
Fig 12-1: RB-DDA6W Front Panel 39
Fig 12-2: RB-DDA6W Rear Panel 39
Fig 12-3: RB-DDA6W System Block Diagram 40
Fig 13-1: RB-DDA6W-2P Front Panel 42
Fig 13-2: RB-DDA6W-2P System Block Diagram 43
Fig 13-3: RB-DDA6W-2P Rear Panel 44
Fig 13-4: RB-DDA6W-2P Alarm Connector Diagram 44
Fig 14-1: RB-DDA22 Front Panel 46
Fig 14-2: RB-DDA22 Front Panel Controls 46
Fig 14-3: RB-DDA22 System Block Diagram 47
Fig 14-4: RB-DDA22 Rear Panel 48
Fig 15-1: RB-AES4B3 Front Panel 50
Fig 15-2: RB-AES4B3 System Block Diagram 50
Fig 15-3: RB-AES4B3 Front Rear Panel 51
Fig 15-4: RB-AES4B3 Examples Of Cumulative Cabling 52
Fig 16 -1: RB-AES4X3 Front Panel 53
Fig 16-2: RB-AES4X3 System Block Diagram 53
Fig 16-3: RB-AES4X3 Rear Panel 54
Fig 16-4: RB-AES4X3 Examples Of Cumulative Cabling 55

Figures
Fig 17-1: RB-MS4X3 Front Panel 56
Fig 17-2: RB-MS4X3 System Block Diagram 56
Fig 17-3: RB-MS4X3 Front Panel Connections 57
Fig 17-4: RB-MS4X3 Rear Panel Connections 58
Fig 17-5: RB-MS4X3 Examples Of Usage 59
Fig 18-1: RB-MSP6 Front Panel 60
Fig 18-2: RB-MSP6 System Block Diagram 60
Fig 18-3: RB-MSP6 Front Panel LED Indicators 61
Fig 18-4: RB-MSP6 Rear Panel Connections 61
Fig 18-5: RB-MSP6 Fault Scenario Diagram 62

Warranty Registration
Sonifex Limited y 61 Station Road y Irthlingborough y Northamptonshire y NN9 5QE y United Kingdom
Tel: [phone] y Fax: [phone] y Email: t[email protected] y Internet: www.sonifex.co.uk
Register Online for an
Extended 2 Year Warranty
As standard, Sonifex products are
supplied with a 1 year back to base
warranty.
If you register the product online, you
can increase your product warranty
to 2 years and we can also keep
you informed of any product design
improvements or modifications.
To register your product, please go online to www.sonifex.co.uk/register
Product:
Serial No:

ii
Warranty
Product Warranty - 2 Year Extended
As standard, Sonifex products are supplied with a 1 year back to base
warranty. In order to register the date of purchase and so that we can keep
you informed of any product design improvements or modifications, it is
important to complete the warranty registration online. Additionally, if you
register the product on the Sonifex website, you can increase your product
warranty to 2 years. Go to the Sonifex website at: http://www.sonifex.
co.uk/technical/register/index.asp to apply for your 2 year warranty.
Note: For your own records the product serial number is recorded on the
CE certification page of this handbook.
Sonifex Warranty & Liability Terms & Conditions
1. Definitions
‘the Company’ means Sonifex Ltd and where relevant includes companies
within the same group of companies as Sonifex Limited.
‘the Goods’ means the goods or any part thereof supplied by the Company
and where relevant includes: work carried out by the Company on items
supplied by the Purchaser; services supplied by the Company; and software
supplied by the Company.
‘the Purchaser’ means the person or organisation who buys or has agreed
to buy the Goods.
‘the Price’ means the Price of the Goods and any other charges incurred by
the Company in the supply of the Goods.
‘the Warranty Term’ is the length of the product warranty which is usually
12 months from the date of despatch; except when the product has been
registered at the Sonifex website when the Warranty Term is 24 months
from the date of despatch.
‘the Contract’ means the quotation, these Conditions of Sale and any
other document incorporated in a contract between the Company and the
Purchaser.
This is the entire Contract between the parties relating to the subject
matter hereof and may not be changed or terminated except in writing in
accordance with the provisions of this Contract. A reference to the consent,
acknowledgement, authority or agreement of the Company means in
writing and only by a director of the Company.
2. Warranty
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 the Warranty Term
provided that each of the following are satisfied:
i. notification 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;

iii
Warranty
vi. the defect has not arisen from a design made, furnished or
specified 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 modified 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 benefit 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.
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 profits 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 specific 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 defined
by the Consumer Transactions (Restrictions on Statements) Order
1976) the statutory rights of the Purchaser are not affected by these
Conditions of Sale.
Unpacking Your Product
Each product is shipped in protective packaging and should be inspected
for damage before use. If there is any transit damage take pictures of the
product packaging and notify the carrier immediately with all the relevant

iv
CE Conformity
details of the shipment. Packing materials should be kept for inspection and
also for if the product needs to be returned.
The product is shipped with the following equipment so please check to
ensure that you have all of the items below. If anything is missing, please
contact the supplier of your equipment immediately.
Item Quantity
Product unit 1
IEC mains lead fitted with moulded mains plug 1
Handbook and warranty card 1
If you require a different power lead, please let us know when ordering the
product.
Repairs & Returns
Please contact Sonifex or your supplier if you have any problems with your
Sonifex product. Email [e-mail] for the repair/
upgrade/returns procedure, or for support & questions regarding the
product operation.
Conformity
The products in this manual comply with the essential requirements of the
relevant European health, safety and environmental protection legislation.
The technical justification file for this product is available at Sonifex Ltd.
The declaration of conformity can be found at:
http://www.sonifex.co.uk/declarations
Safety & Installation of Mains
Operated Equipment
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. The cover is connected to earth
by means of the fixing screws. It is essential to maintain this earth/
ground connection to ensure a safe operating environment and provide
electromagnetic shielding.
Voltage Setting Checks
Ensure that the machine operating voltage is correct for your mains power
supply by checking the box in which your product was supplied. The voltage
is shown on the box label. The available voltage settings are 115V, or 230V.
Please note that all products are either switchable between 115V and 230V,
or have a universal power supply.
Fuse Rating
The product 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 fire hazard, under equipment fault conditions. The active fuse is
fitted on the outside rear panel of the unit.
Power Cable & Connection
An IEC power connector is supplied with the product which has a moulded
plug attached.
The mains plug or IEC power connector is used as the disconnect device.
The mains plug and IEC power connector shall remain readily operable to
disconnect the apparatus in case of a fault or emergency.
The mains lead is automatically configured for the country that the product
is being sent to, from one of:

v
Safety & Installation
Fig A: RB-RK1 Small Redbox Front Rack-mount Kit .
Territory Voltage IEC Lead Type Image
UK & Middle East 230V UK 3 pin to IEC lead
Europe 230V European Schuko round 2 pin to
IEC lead
USA, Canada and
South America 115V 3 flat pin to IEC lead
Australia & New
Zealand 230V Australasian 3 flat pin to IEC lead
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.
This apparatus is of a class I construction. It must be connected to a mains
socket outlet with a protective earthing connection.
Important note: If there is an earth/ground terminal on the rear panel of
the product then it must be connected to Earth.
WEEE Directive
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.
All products manufactured by Sonifex Ltd have the WEEE directive label
placed on the case. Sonifex Ltd will be happy to give you information about
local organisations that can reprocess the product when it reaches its “end
of use”, or alternatively all products that have reached “end of use” can be
returned to Sonifex and will be reprocessed correctly free of charge.
Atmosphere/Environment
This apparatus should be installed in an area that is not subject to excessive
temperature variation (<0°C, >50°C), moisture, dust or vibration.
This apparatus shall not be exposed to dripping or splashing, and no objects
filled with water, such as vases shall be placed on the apparatus.
Fitting Redboxes
Redboxes can be fixed to the underside of a desk, or other surfaces
using 4.2mm holes in the sides and fixed with 2 x M4 screws or 2 x No. 6
countersink wood screws.

vi
Safety & Installation
They can also be rack-mounted, with either the front, or rear of the Redbox positioned at the front of the rack (Note: this product is front rack-mounted as
standard):
Front Mounting Redboxes: For rack mounting smaller (28cm) units the optional RB-RK1 (Red) or RB-RK1B (Black) kit can be used (which include
4 off M6 panel fixing screws).
Rear Mounting a Redbox: For rear panel mounting you can use either the RB-RK2 (in this case), or RB-RK3, depending on the size of your Redbox.
Fig B: RB-RK2 Small Redbox Rear Rack-mount Kit.
Fig C: RB-RK3 Large Redbox Rear Rack-mount Kit.

1
Audio Distribution Amplifier - RB-DA6 1
1 RB-DA6 6 Way Stereo Distribution Amplifier
Introduction
Fig 1-1: RB-DA6 Front Panel.
The RB-DA6 is a high performance 6 way stereo analogue distribution
amplifier for splitting a source to a number of different outputs. The
RB-DA6 has 1 stereo input and 6 stereo outputs with gain control on both
inputs. It can also be configured so that 1 mono input can be distributed to
12 outputs.
The XLR-3 inputs and outputs are electronically balanced and can be wired
unbalanced. Each output is individually buffered so that a short circuit on
one won’t affect the others.
The RB-DA6 has master left and right gain controls which are pre- set
potentiometers accessible through the front panel.
Left Outputs
Balanced
Left Input
Balanced
Stereo/Mono
Right
Input
Balanced
Right Outputs
Balanced (Mono 7-12)
Gain
Gain
1 2 3 4 5 6 1 2 3 4 5 6
System Block Diagram
Fig 1-2: RB-DA6 System Block Diagram

2
1 Audio Distribution Amplifier - RB-DA6
Connections and Operation
Fig 1-3: RB-DA6 Rear Panel
Inputs (Left and Right)
The XLR-3 input connectors can take balanced professional levels, or
unbalanced by using the front panel gain controls, and by connecting the
non-phase to the signal ground. The input can be configured as either a
stereo input with six stereo outputs or a mono input with twelve outputs.
The XLR 3 pin input has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
Stereo Outputs 1-6 (Mono Outputs 1-12)
The XLR 3 pin outputs are electronically balanced, and can be wired
unbalanced. Each output is individually buffered so that a short circuit on
one output will not affect the others. They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
OutputsInputs
Input Gain Control
The input gain on the RB-DA6 can be varied –8dB to 18db by adjusting the
pre-set potentiometers. These are accessible through the holes in the front
panel. The RB-DA6 has separate left and right master gain controls.
Stereo/Mono Operation
The mode of operation may be switched between a stereo distributed
channel to 6 stereo channels, and a mono channel to 12 mono channels, by
the push button on the front panel, which is recessed to prevent accidental
switching.

3
Audio Distribution Amplifier - RB-DA6 1
Technical Specifications RB-DA6
Audio Specifications
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Maximum Input Level: +28dBu
Maximum Output Level: +28dBu
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Common Mode Rejection:>66dB typically
Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Noise: -100dB unity gain ref +8dB
Connections
Inputs: 2 x 3 pin female (Balanced, can be unbalanced)
Outputs: 12 x XLR 3 pin male (Balanced, can be
unbalanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V, fused,
6W maximum
Fuse Rating: Anti-surge fuse 100mA 20 x 5mm (230VAC)
Anti-surge fuse 250mA 20 x 5mm (115VAC)
Equipment Type
RB-DA6: 6 way stereo distribution amplifier
Physical Specifications
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
19” (W) x 4.3” (D) x 1.7” (H) (1U)
Dimensions (Boxed): 58.5cm (W) x 22.5cm (D) x 7cm (H)
21” (W) x 8” (D) x 2.4” (H)
Weight: Nett: 1.3kg Gross: 1.9kg
Nett: 2.9lbs Gross: 4.2lbs

4
2 Audio Distribution Amplifier - RB-DA6G
2 RB-DA6G 6 Way Stereo Distribution Amplifier With Output Gain Control
Introduction
Fig 2-1: RB-DA6G Front Panel
The RB-DA6G is a high performance 6 way stereo analogue distribution
amplifier for splitting a source to a number of different outputs.
The RB-DA6P has 1 stereo input and 6 stereo outputs with gain control
on both inputs. It can also be configured so that 1 mono input can be
distributed to 12 outputs. As a variant of the RB-DA6, the RB-DA6G, has an
individual gain control on every output.
On the RB-DA6G the XLR-3 inputs and outputs are electronically balanced
and can be wired unbalanced. Each output is individually buffered so that a
short circuit on one won’t affect the others.
The RB-DA6G has master left and right gain controls which are pre- set
potentiometers accessible through the front panel. Each channel has
an individual output gain control (normalising) which are all pre-set
potentiometers, also accessible through the front panel. The 1-12 mono,
1-6 stereo switch is recessed on the front panel to prevent accidental
knocking. An LED power indicator on the front panel displays the power
supply connection.
System Block Diagram
Left Outputs
Balanced
Left Input
Balanced
Stereo/Mono
Right Input
Balanced
Right Outputs
Balanced (Mono 7-12)
1 2 3 4 5 6 1 2 3 4 5 6
Fig 2-2: RB-DA6G System Block Diagram

5
Audio Distribution Amplifier - RB-DA6G 2
Connections and Operation
Fig 2-3: RB-DA6G Rear Panel
Inputs (Left and Right)
The XLR-3 input connectors can take balanced professional levels, or
unbalanced by using the front panel gain controls, and by connecting the
non-phase to the signal ground. The input can be configured as either a
stereo input with six stereo outputs or a mono input with twelve outputs.
The XLR 3 pin input has the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
Stereo Outputs 1-6 (Mono Outputs 1-12)
The XLR 3 pin outputs are electronically balanced, and can be wired
unbalanced. Each output is individually buffered so that a short circuit on
one output will not affect the others. They have the following connections:
Pin 1: Screen
Pin 2: Phase
Pin 3: Non-phase
OutputsInputs
Output Gain Control
The output gain on the RB-DA6G can be varied –8dB to 18dB by adjusting
the pre-set potentiometers. These are accessible through the holes in the
front panel. The RB-DA6G has output gain controls on every output.
Stereo/Mono Operation
The mode of operation may be switched between a stereo distributed
channel to 6 stereo channels, and a mono channel to 12 mono channels, by
the push button on the front panel, which is recessed to prevent accidental
switching.

6
2 Audio Distribution Amplifier - RB-DA6G
Technical Specifications RB-DA6G
Audio Specifications
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Maximum Input Level: +28dBu
Maximum Output Level: +28dBu
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Gain Range: Adjustable 8dB loss to 18dB gain
Common Mode Rejection:>66dB typically
Distortion: 0.01% THD @ 1kHz, ref +8dBu output
Noise: -88dB unity gain ref +8dB
Connections
Inputs: 2 x 3 pin female (Balanced, can be unbalanced)
Outputs: 12 x XLR 3 pin male (Balanced, can be
unbalanced)
Mains Input: Filtered IEC, 110V-120V, or 220-240V, fused,
6W maximum
Fuse Rating: Anti-surge fuse 100mA 20 x 5mm (230VAC)
Anti-surge fuse 250mA 20 x 5mm (115VAC)
Equipment Type
RB-DA6G: 6 way stereo distribution amplifier with
output gain
Physical Specifications
Dimensions (Raw): 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
19” (W) x 4.3” (D) x 1.7” (H) (1U)
Dimensions (Boxed): 58.5cm (W) x 22.5cm (D) x 7cm (H)
21” (W) x 8” (D) x 2.4” (H)
Weight: Nett: 1.3kg Gross: 1.9kg
Nett: 2.9lbs Gross: 4.2lbs

7
Audio Distribution Amplifier - RB-DA6P 3
3 RB-DA6P 6 Way Stereo Distribution Amplifier
Introduction
Fig 3-1: RB-DA6P Front Panel
The RB-DA6P is a high performance 6 way stereo analogue distribution
amplifier for splitting a source to a number of different outputs. The RB-
DA6P has 1 stereo input and 6 stereo outputs with gain control on both
inputs. It can also be configured so that 1 mono input can be distributed to
12 outputs.
The RB-DA6P is a version of the RB-DA6 audio distribution amplifier which
uses Neutrik Phoenix stlye connectors instead of XLR inputs and outputs.
Each unit is shipped with the mating connectors so that wires can be simply
terminated using a small flat-blade screwdriver. The inputs and outputs
are electronically balanced and can be wired unbalanced. Each output is
individually buffered so that a short circuit on one won’t affect the others.
It has master left and right gain controls which are pre- set potentiometers
accessible through the front panel.
Left Outputs
Balanced
Left Input
Balanced
Stereo/Mono
Right
Input
Balanced
Right Outputs
Balanced (Mono 7-12)
Gain
Gain
1 2 3 4 5 6 1 2 3 4 5 6
System Block Diagram
Fig 3-2: RB-DA6P System Block Diagram

8
3 Audio Distribution Amplifier - RB-DA6P
Connections and Operation
Inputs (Left and Right)
The Phoenix style input connectors can take balanced professional levels,
or unbalanced by using the front panel gain controls, and by connecting
the non-phase to the signal ground. The input can be configured as either
a stereo input with six stereo outputs or a mono input with twelve outputs.
The connections are shown in Fig 1-8.
Stereo Outputs 1-6
(Mono Outputs 1-12)
The Phoenix style 3 pin outputs are
electronically balanced, and can be
wired unbalanced. Each output is
individually buffered so that a short
circuit on one output will not affect the
others. The connections are shown in
Fig 3-4.
Input Gain Control
The input gain on the RB-DA6 can be varied –8dB to 18db by adjusting the
pre-set potentiometers. These are accessible through the holes in the front
panel. The RB-DA6 has separate left and right master gain controls.
Stereo/Mono Operation
The mode of operation may be switched between a stereo distributed
channel to 6 stereo channels, and a mono channel to 12 mono channels, by
the push button on the front panel, which is recessed to prevent accidental
switching.
Fig 3-3: RB-DA6P Rear Panel
OutputsInputs
Phase Screen
Non-Phase
INPUT OUTPUT
Screen Phase
Non-Phase
Fig 3-4: RB-DA6P Phoenix Connectors