Sonifex S1 User manual

S1 Radio Broadcast Mixer
10 Channel Analogue-Digital
HANDBOOK
Manufacturers of audio & video
products for radio & TV broadcasters

S1 Handbook
This handbook is for use with the following product:
S1 Radio Broadcast Mixer, 10 Channel Analogue-Digital
AW10777
Stock Code: 30-172
Revision 1.03, December 2018
©Sonifex Ltd, 2018
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
Contents
Product Warranty - 2 Year Extended i
Sonifex Warranty & Liability Terms & Conditions i
Unpacking Your Product ii
Repairs & Returns iii
Conformity iii
Safety & Installation of Mains Operated Equipment iii
Voltage Setting Checks iii
Fuse Rating iii
Power Cable & Connection iii
WEEE Directive iv
Atmosphere/Environment iv
1 Introduction 1
Innovative Design 1
Superb Audio Quality & Unquestionable Reliability 1
Installation Notes 2
2 User Guide 5
User Guide – Section 2-1 5
User Guide – Section 2-2 Input Channels 7
User Guide – Section 2-3 Front Panel Channel Features 8
User Guide – Section 2-4 Metering and Monitors 11
Monitor and Headphone Controls 12
Meter Controls 13
User Guide – Section 2-5 Output Buses 13
Auxiliary Outputs 14
3 Mixer Applications 16
Presenter Controlled Studio 16
Producer Controlled Studio With Seperate Presenter 18
User Guide – Section 2-3 Making the most of
auxiliary outputs 19
User Guide – Section 3-4 External equipment and the S1 20
Telephone hybrid 20
4 Advanced Configurations 22
User Guide – Section 4-1 Using the Remote Control 22
User Guide – Section 4-2 General purpose inputs
and outputs 23
User Guide – Section 4-3 SCi and the S1 24
SCi for S1 24
Channel Configuration 25
GPIO Configuration 27
For the latest Sonifex handbook information please visit the
Sonifex website at www.sonifex.co.uk

Contents & Figures
System configuration 28
Talkback Setup Box 29
Information & Updates 29
RS-232 indicators 30
Options menu 30
5 Connectors and Cabling 31
Connector Pin Outs 32
6 Technical Specification 35
7 Default Settings 37
8 Serial Communication Protocol 39
Serial Data Format 39
Remote Control Commands 39
9 Glossary 46
Figures
Fig 1-1: S1 Top View 1
Fig 1-2: Dimensions & Cut-Out Sizes For S1 Mixer 3
Fig 1-3: S1 Mixer Rear View 3
Fig 1-4: S1 Mixer Top View 4
Fig 2-1: input Stages 5
Fig 2-2: Output & Power Board 6
Fig 2-3: Main Mix Stage 6
Fig 2-4: Monitors 7
Fig 2-5: Channels 1 and 2 Mic / Line Inputs 7
Fig 2-6: Channels 3 and 4 - Mic / Mono Line / Stereo Line Inputs 7
Fig 2-7: Channel 5 - Mic / Telco Input 7
Fig 2-8: Channel 6 – Stereo Line / Stereo Cleanfeed Input 8
Fig 2-9: Channel 7 and 8 – Stereo Line / RCA Inputs 8
Fig 2-10: Channel 9 and 10 - Stereo Line / Digital Inputs 8
Fig 2-11: External Inputs 8
Fig 2-12: Input Selection 8
Fig 2-13: DROP-IN Jack 8
Fig 2-14: AUX Controls 9
Fig 2-15: Equalisation Controls 9
Fig 2-16: TRIM Control 9
Fig 2-17: PAN Control 9
Fig 2-18: Balance Control 9
Fig 2-19: CUE/PFL Selection 9
Fig 2-20: CUE/PFL & T/B Selection 10
Fig 2-21: ON Selection 10
Fig 2-21B: LINE HOLD 10
Fig 2-22: Scribble Pad 10
Fig 2-23: Fader 11
Fig 2-24: Monitor and headphone sockets 11
Fig 2-25: Presenter & Guest Headphones Connector 11
Fig 2-26: Level controls 12
Fig 2-27: Program/ Meters Follow Monitors 13
Fig 2-28: PPM / VU 13
Fig 2-29: PGM Output 13
Fig 2-30: Cleanfeed Outputs 13
Fig 2-31: Digital Outputs 14
Fig 2-32: Lock Indicator 14
Fig 2-33: Stereo Aux Outputs 14
Fig 2-34: Auxiliary master gain and PRE / POST Selection 14
Fig 3-1a: Presenter In Studio - External Equipment Connections 16
Fig 3-1b: Presenter In Studio - Telephone Line Connections 17
Fig 3-1c: Presenter In Studio - Presenter and Guest Connections 17
Fig 3-2a: Presenter And Producer In Control Room - External
Equipment Connections 18
Fig 3-2b: Presenter And Producer In Control Room -
Telephone Line Connections 18
Fig 3-2c: Presenter And Producer In Control Room -
Presenter and Guest Connections 19
Fig 3-3: On-Air Light 21
Fig 4-1: RS-232 Serial Port 24
Fig 4-2: SCi Launcher 24
Fig 4-3: Main Screen 24
Fig 4-4: Channel Configuration Screen 25
Fig 4-5: GPIO Configuration Screen 27
Fig 4-6: System Configuration Screen 28
Fig 4-7: Information & Updates Screen 29
Fig 5-1: XLR 3 Pin Connectors 31
Fig 5-2: RCA Phono Connector 31
Fig 5-3: BNC Connector 31
Fig 5-4: 6.35mm ‘A’ Gauge Stereo Jack Plugs 31
Fig 5-5: D Type Connectors 32

Warranty Registration
Sonifex Limited 61 Station Road Irthlingborough Northamptonshire NN9 5QE United Kingdom
Tel: [phone] Fax: [phone] Email: [e-mail] 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.
Product:
Serial No:
To register your product, please go online to www.sonifex.co.uk/register

i
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;

ii
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

iii
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
GSM stubby antenna 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:

iv
Safety & Installation
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.

1
Introduction 1
1 Introduction
The Sonifex S1 Mixer is a compact, low cost,
fixed format radio on-air mixing console
designed to cater for a wide and far reaching
broadcast market. On the surface, it is simple
and easy to use but it also has hidden layer
of variety and flexibility for those who like to
get into the heart of their products, tweak
the engine so to speak. Using the latest
technology components, S1 offers digital
audio quality with analogue reliability. S1 has
both digital and analogue input channels,
together with simultaneous analogue and
digital outputs.
Innovative Design
• The S1 can be rackmounted or used as a
desktop mixer
• The back panel connections can be rotated
onto the back of the unit or onto the base
of the unit
• Large back-lit buttons allow you to see the
status of the mixer at all times.
Superb Audio Quality &
Unquestionable Reliability
• The S1 uses the latest semiconductor
technology to allow input of SPDIF
& Toslink digital audio signals up to
24bit,192kHz, and the output of AES/EBU
and S/PDIF digital audio signals up to 24
bit, 96kHz sample rate.
Fig 1-1: S1 Top View

2
1 Introduction
• The analogue signal paths use low noise circuitry to provide superb audio
performance well capable of satisfying radio listeners worldwide.
• The high reliability and build quality of the S1 minimises the chance of
failure, avoiding lost air-time.
• ALPS long-throw 100mm faders give a smooth, repeatable response and
the XLR Neutrik connectors used are an industry standard.
• The use of VCA’s controlled by the faders ensures tight stereo tracking
and eliminates mechanical and electronic noise.
• The S1 has an internal power supply providing regulated, ripple-free
power, to the mixer.
• High quality anodised aluminium is used for the chassis to…
Progress
Following on from the Sonifex Sovereign range of audio mixers, the S1
combines all the features needed of a radio broadcast mixer in a stylish,
flush-mounting chassis: a wide range of input and output channels, CUE/
PFL, fader-start operation of equipment, automatic monitor muting on
mic-live, light switching remote outputs, EQ on input modules, two auxiliary
busses,two external inputs and a main program audio bus.
Flexible
The S1 is a highly configurable unit and has been designed to be jumper
free, allowing the user to alter the configuration quickly whilst still on air
rather than having to take apart the unit armed with a pair of tweezers and
a magnifying glass. The majority of the desk can be setup and controlled
using the Sonifex SCI Software. This opens up a world of options:
• Producer Controlled Environment – SCi allows the producer or engineer
to control all settings and parameters reducing the required skill set of
the Presenter and leaving them to focus on their broadcast.
• Remote Control – Control external equipment using the dedicated
remote control ports. These are great for starting or stopping CD players
and other external equipment and are fully configurable to suit most
manufacturers and remove limitations.
• Global Talkback – Allow all your guests to hear each other through their
headphones, alleviating the risk of Mic/ Headphone feedback. (for more
details refer to page 19.
• Automation Tally – Give a visual indication of an impending event to a
presenter using the versatile GPIO system.
• Many more examples covered in the user setup section.
Installation Notes
Atmosphere
The S1 mixer should be installed in an area which is not subject to excessive
heat or cold. Also, you should avoid installing it in atmospheric conditions
which are dusty, smoky, or dirty, or where there is moisture or vibration.
Do not use any liquids to clean the fascia of the mixer: a soft dry brush is
ideal. Use a clean cloth moistened with water or ethyl alcohol to clean the
trim and scribble pads. Other solvents may cause damage to paint or plastic
parts.
Electromagnetic Radiation
Avoid using the S1 mixer close to strong sources of electromagnetic
radiation such as, video monitors or high power electric cabling. This
may cause degradation of the audio quality due to induced voltages in
connecting leads and chassis. In all cases the S1 mixer should be installed
and serviced by qualified personnel.
Dimensions and Cut-Out Sizes
The cut-out size is for reference only and should be checked with your
mixer.

3
Introduction 1
S1 cut out
viewed
from above
Table top front edge
440mm+2
-0
381mm+2
-0
Fig 1-2: Dimensions & Cut-Out Sizes For S1 Mixer
Fig 1-3: S1 Mixer Rear View

4
1 Introduction
Fig 1-4: S1 Mixer Top View

5
User Guide 2
2 User Guide
Getting to know your mixer
The following section will display and explain the features of S1 Mixer from
input through to output. Please read this section thoroughly to acquaint
yourself thoroughly with the myriad of options available. However, if
you are more interested in setting it up skip to the next chapter - Mixer
Applications.
The following section is divided into these parts:
1. System block diagrams – If you are electronically inclined, dive into the
inner workings of the S1.
2. Input channel types – Discover the type of Inputs available to you.
Page 7.
3. Front panel channel features – All channel knobs and buttons explained.
Page 8.
4. Metering, monitors and headphones – Explore the Metering options and
find out where to plug in your monitors and stick your headphone jack.
Page 12.
5. Output buses – Understand all the output options you have. Page 13.
Stereo
Input
Digital
Mic
Input
Input
Line
Input
XLR
Input
Stereo
Phono
Mono
Stereo XLR
Aes Receiver
And
Digital Source Select DAC
S/PDIF
Optical
Trim
Stereo XLR
Phono
Mono Line
Stereo Line
Remotes
Remotes
Remote Drivers
Transistor Pull Down
Signal Inverters
+10dB
+10dB
+48V
+10dB
L
R
L
R
User Guide – Section 2-1
System Block Diagrams
Fig 2-1: input Stages

6
2 User Guide
Digital Audio
Transmitter
Transceiver
CPU
A/D
RS232
S/PDIF
AES/EBU
Output
Limiter
Limiter
Mic Live
Remote Relay 3 Output Contacts
VCA
VCA
PGM L
PGM R
Meterbridge
Control
Digital Audio
Transceiver
Wordclock
S/PDIF
AES/EBU
SYNC
Meterbridge
Interface
Talkback
Interface
TBOUT
REV T/B
Meter L
Meter R
PFL L
PFL R
PGM L
PGM R
External
Inputs
+10dB
+10dB
+10dB
+10dB
EXT 1
EXT 1
EXT 2
EXT 2
L
-
-
+
+
+
L
R
R
To Monitor Selections
From Monitor Selections
From Mix Busses
Additional Connector
Monitor
Presenter
Guest
Headphones
L
L
R
R
PGM Output
STCF Output
Stereo AUX
Outputs
AUX 1
AUX 2
To F. Panel
L
R
L
R
L
R
Cleanfeed
-
+
-
Fig 2-2: Output & Power Board
HF EQ LF EQ
Fader Fader Up
Pan
Pan VCA
VCA
Trim
AUX 1
Send
AUX 2
Send
Talkback
Open
Logic Channels
1-5
Channel 1
Only
From Mono Inputs
Input 1
Input 2
Cue/PFL
On
Channels
PFL
On
AUX
Pre
Post Pre Post
PGM L
PGM R
PFL R
PFL L
TBOUT
STCF R
STCF L
Cleanfeed
AUX 1L
AUX 1R
AUX 2L
AUX 2R
To Output Drivers + Monitor Selection
Analogue Audio Multiplexers Onto Mix Busses
HF EQ LF EQ Trim Bal
Fader Fader Up
AUX 1
Send
AUX 2
Send
VCA
VCA
Open
Logic
Insert On
Channel 7 Only
6-10
Channels
From Stereo Inputs
TRIM
Fig 2-3: Main Mix Stage

7
User Guide 2
User Guide – Section 2-2 Input Channels
S1 Input Channels
The S1 has 10 fixed format channels with two selectable inputs on each
channel:
• 2 x Mono XLR Mic / Mono XLR Line Inputs
• 2 x 1 Stereo Jack Line Input
• 1 x Mono XLR Mic / Mono XLR Telco Input
• 1 x Stereo XLR Line / Stereo XLR Cleanfeed Input
• 2 x Stereo XLR Line / Stereo RCA Inputs
• 2 x Stereo XLR Line / Stereo SPDIF & Toslink Digital Inputs
Each balanced line channel has the option of a coarse 10dB boost and each
microphone channel has the option of 48V phantom power. Both of these
options are activated by pressing a small push button close to the inputs on
the rear connectors. These buttons are recessed so that they can not be set
Fig 2-3: Main Mix Stage
T/B
AUTO
CUE/PFL
Meter
Follow
AUTO
CUE/PFL
SPLIT
CUE/PFL
Monitor
AUTO
CUE/PFL
Pfl L
Pfl R
Meter L
Meter R
To Meterbridge
Guest Headphone
Push Button
Control
Presenters Headphones
Push Button
Control Analogue
Multiplexers
Left
Led Ppm/vu Meter
PPM
VU
Right
PPM
VU
Signal
Rectifier
Pgm L
Pgm R
Loudspeaker
Monitor Loudspeaker
Monitor
Monitor Level
EXT 1L
EXT 1R
EXT 2L
EXT 2R
Analogue
Multiplexers Analogue
Multiplexers
Headphone
Monitor
CUE/PFL
Selection
Headphone
Monitor
Presenter
Headphone
To Headphone/crm
Output Drivers
Analogue
Multiplexers
Analogue
Multiplexers
Analogue
Multiplexers
Volume
Control
PGM L
PGM R
PFL R
PFL L
TBOUT
AUX 1L
AUX 1R
AUX 2L
AUX 2R
Analogue
Multiplexers
Guest
Headphones
Guest Headphone
Volume Control
Rev T/b
Fig 2-4: Monitors
accidentally. You will need a small screwdriver or something similar to push
these in or out.
Channels 1 and 2 Mic / Line
Inputs
The Mic/Line Input channel is a mono
input with a button switch to select
either Mic or Mono Line. Channel 1
is used for the presenter’s mic and is
the source for talkback. The Talkback
source can be set to come from either
the Mic or the Line source irrespective
of the channel input selection.
Channels 3 and 4 - Mic / Mono
Line / Stereo Line Inputs
The Mic/Mono Line/Stereo line Input
channel is a stereo input channel with
a button switch to select either Mic,
Mono Line or Stereo Line. The stereo
line is fed through a jack connector
which is found in the centre of the XLR
line connectors.
Channel 5 - Mic / Telco Input
The telco channel is used to
interface the S1 with a telephone
hybrid unit. The hybrid unit is
connected through an XLR with a
Microphone channel provided as
an alternative. The telco channel
connector group also contains a
cleanfeed output via XLR to return
to the Hybrid.
Fig 2-5: Channels 1 and 2 Mic /
Line Inputs
Fig 2-6: Channels 3 and 4 - Mic /
Mono Line / Stereo Line Inputs
Fig 2-7: Channel 5 - Mic / Telco Input

8
2 User Guide
Channel 6 – Stereo Line / Stereo
Cleanfeed Input
The Stereo Cleanfeed channel has one
balanced stereo input and a balanced
stereo cleanfeed input, on XLR connectors.
The channel is intended for use where a
remote stereo source, such as another
studio connected via ISDN, requires a
stereo cleanfeed return. The cleanfeed is
generated by a separate stereo cleanfeed
bus which follows the PGM output routing
matrix.
Channel 7 and 8 – Stereo Line / RCA
Inputs
Channels 7 & 8 have one balanced stereo
input and an unbalanced RCA stereo input.
Channel 7 also has DROP IN connector
which allows for an input from a a 3.5mm
jack connector.
Channel 9 and 10 - Stereo Line /
Digital Inputs
The Digital Stereo Input channel has
one standard stereo XLR Analogue Input
channel & one 24-bit 192kHz digital inputs
with a button switch to select between
them. The digital input is auto sensing
& can be connected via either SPDIF or
Toslink. The digital signals are converted
to analogue and from this point the
channel functions are the same as the Dual
Stereo Line Input channel.
External Inputs
Two external inputs are available to the S1
through a 9 pin D-Type connector located on the
rear panel. The external inputs are used for audio
which should be heard in the control room but
not on air. The pin out for this connector can be
found in Appendix B.
User Guide – Section 2-3 Front
Panel Channel Features
Input Selection
Selecting the button changes the channel input
connection between Input 1 (Mic) and Input 2
(Line). The button is illuminated in red to indicate
when input 2 is selected. When the channel is
routed, so that the ON button glows green, the
input selection cannot be changed.
Channels 3 and 4 have three selectable inputs;
Mic, XLR Mono Line, ¼” unbalanced stereo line.
The input selection button will glow red when
Mono Line is selected and Orange to indicate
the stereo input is selected. The button can
be configured using SCi so that the button is
forced to a particular input or alternatively the
selection of either the Line input or the Stereo
Line input can be inhibited so that the button has
only two options as two line sources cannot be
simultaneously connected.
DROP-IN Jack
On Channel 7 only, there is a 3.5mm insert jack
allowing the direct connection of mp3 players
Fig 2-8: Channel 6 – Stereo Line /
Stereo Cleanfeed Input
Fig 2-9: Channel 7 and 8 – Stereo
Line / RCA Inputs
Fig 2-10: Channel 9 and 10 -
Stereo Line / Digital Inputs
Fig 2-11: External Inputs
Fig 2-12: Input
Selection
Fig 2-13: DROP-IN
Jack

9
User Guide 2
or other portable consumer equipment. When
the INSERT jack is in use, it overrides the Input
Selection Button.
AUX Controls
Each channel is sent to both auxiliary buses at
all times. The AUX controls allow adjustment
of the level of each channel on the bus to
achieve a perfect mix. The control changes the
level between fully attenuated and unity so to
remove a mix from a particular auxiliary bus, fully
attenuate that particular channel.
Equalisation Controls
In some situations you made need to change
the equalisation of your audio. The HF and LF
controls are used to adjust the equalisation of
the signal. The HF control boosts and cuts the
signal by ±7dB at 6.5kHz. The LF control boosts
and cuts the signal by ±7dB at 100Hz. The
fundamental frequency of human voice generally
sits between 100 and 150 Hz. Try lowering the LF
control on microphone channels to get rid of any
unnecessary low frequency audio while slightly
boosting the HF to add clarity.
TRIM Control
The Trim control is used to tweak the level of
the channel on the PGM output. It provides
an additional ±12dB of gain to fine tune the
input signal level. It is a good idea to set up all
your audio channels so that they are all at the
same reference level when the fader is fully up,
meaning the mix levels are determined solely by
the position of the faders. This is where to use
the trim pots, for level adjustment which remains
constant through the mix.
PAN Control
The Pan control is used to pan the mono input
signal on channels 1,2 and 5 in the stereo image.
Fully anti-clockwise pans the signal to the left and
increases the signal by 3dB (right channel reduces
by 70dB); full clockwise pans the signal to the
right and increases the signal by 3dB (left channel
reduces by 70dB).
Balance Control
The balance control is used to alter the stereo
image of a stereo input source on channels 3, 4,
6, 7, 8, 9 and 10. Turning the potentiometer fully
anti-clockwise shifts the signal to the left and
increases the signal by 6dB (right channel reduces
by 6dB); fully clockwise shifts the signal to the
right and increases the signal by 6dB (left channel
reduces
by 6dB).
CUE/PFL Selection
Selecting the CUE/PFL button routes the pre-
fader input signal to the monitoring system where
the signal can be heard via headphones and/or
loudspeakers. The level may be checked on meters
and adjusted via the TRIM control and panned via the
PAN control. The button is illuminated in green when
CUE/PFL is active. There is a configuration option
to cancel the CUE/PFL selection when the fader is
raised. This button works with both a momentary
Fig 2-14: AUX
Controls
Fig 2-15:
Equalisation Controls
Fig 2-16: TRIM
Control
Fig 2-17: PAN
Control
Fig 2-18: Balance
Control
Fig 2-19: CUE/PFL
Selection

10
2 User Guide
and latched operation. If held down, the selection
is cancelled when released, otherwise the button is
alternate action.
CUE/PFL & T/B Selection
On channels 5 and 6 the CUE/PFL and T/B button
operates similarly
to a standard CUE/PFL button except the talkback
source is also routed to the respective cleanfeed
output when the channel input is set to Input 2 (5.
Telco or 6. Stereo Cleanfeed).
An additional option that is configurable using SCi
allows the presenter to CUE/PFL the Telco or STCF
inputs whilst preventing the talkback source from
being routed to the cleanfeed outputs.
If Talkback routing on this channel is ‘disabled’,
the CUE/PFL & T/B button shall flash green when
selected to indicate that talkback is not routed to the
cleanfeed bus. Talkback can be routed to the stereo
cleanfeed bus by holding the CUE/PFL & T/B button
and the button will glow solid. When the button is
released, talkback will return to the unrouted state &
the button will return to flashing green. CUE/PFL can
be deactivated by a momentary press of the button.
This option only applies to Input B of this channel.
ON Selection
The ON (called LINE HOLD on channel 5) button
works in conjunction with the fader. It is used to
control channel remote output logic, channel routing,
and timers. The button LEDs show the various
operational states of the channel.
Unlit
When unlit the channel is off.
On solid - red
Steady red indicates that the channel is ON and
“armed”, ready for the fader to be raised.
On solid - green
Raising the fader changes the illumination to green
indicating that the channel is live. With the button
unlit the fader may be raised and the channel can be
operated simply by selecting ON. The illumination
in this case toggles between unlit and green. The
channel remotes and timers are triggered when the
fader is up and the channel ON button shows green.
Flashing red
On channels 9 and 10 when Input 2 (Digital Input)
is selected, the channel ON button will flash red to
indicate that the input is not locked to a valid source.
The channel cannot be opened if the Digital input is
not synchronised to a valid source.
The button can also flash green and flash orange.
Please refer to the tally back portion of section 4
(page 23) for more information.
Scribble Pad
A scribble pad is provided at the bottom for user
labelling of the channel function . This is useful to
remind a producer or presenter which channels
contain which segments of audio. It is advisable
to use a non-permanent pen or pencil in case of
changes.
Fig 2-20: CUE/PFL &
T/B Selection
Fig 2-21: ON
Selection
Fig 2-21B: LINE
HOLD
Fig 2-22: Scribble
Pad

11
User Guide 2
Fader
The 100mm VCA fader provides a method of dynamic
in-show level control and operates between fully
attenuated in its lowest position and unity gain when
fully open. The channel input signal is routed to the
PGM output whenever the fader is open, and the ON
button is selected. If using the auxiliary bus post fade,
the fader position also affects the level of the channel
on the auxiliary buses. The faders can be forced up for
remote control applications using one of the General
Purpose Inputs.
User Guide – Section 2-4
Metering and Monitors
Monitor and headphone sockets
The S1 provides a monitoring system
to monitor all output channels or
the external inputs. The is useful for
setting up the mixer outputs or to
simply listen to the mix in a control
room. There are four jack outputs in
total; two paralleled presenter outputs,
one guest output and one monitor
output. The source which is heard on
the monitoring system is selectable
via push button. The buttons are set
to interlocking mode by default, which
means the button pressed becomes
the source, cancelling all others. An
alternative mode of operation is mixing
mode, which mixes the output sources
onto the monitor bus instead. All the
buttons can be locked out in either the
off or on positions to stop accidental
selection. To find out how to set up
these functions further please view
section 4 - SCi (page 24). The PGM,
AUX1 and AUX2 buttons all illuminate
in green. EXT1 and EXT2 both
illuminate in red.
Fig 2-23: Fader
Fig 2-24: Monitor and headphone
sockets
Fig 2-25: Presenter & Guest
Headphones Connector

12
2 User Guide
Presenter & Guest Headphones Connector
This standard 6.35mm jack socket is used for the control room headphones
and the guest headphones. The presenter jack is wired in parallel with the
headphone connector on the front panel. Each connector is capable of
driving 35 ohm impedance headphones. Please see section 3 – Applications
(page 16) if you would like to use more than one set of headphones on a
particular output.
Control Room Monitors Connector
This standard 6.35mm jack socket is the output for the control room
monitor loudspeakers. A suitable amplifier should be used to send this
signal to the loudspeakers, or connect active loudspeakers directly to this
output.
Monitor and Headphone Controls
Level controls
Each monitor
output has it’s own
level control which
operates ona range
of zero to ten.
Zero represents
fully attenuated
and ten represents
+6dB in the guest
and presenter
headphones
or unity in the
monitor.
Auto CUE/PFL
When the green illuminated AUTO CUE/PFL button is selected, any input
channels selected to CUE/PFL are automatically routed to the appropriate
out. The selection of this button can be locked if required.
Split CUE / PFL
The presenter headphones have the additional facility of SPLIT CUE/PFL.
When this button is selected, the monitor source will be heard in mono
in the left headphone, and CUE/PFL will be heard in mono in the right
headphone. The button is illuminated yellow when selected. The selection
of this button can be locked if required.
Talkback
When pressed, the Talkback button will route talkback from the talkback
microphone to the guest headphones. The talkback signal can be
configured to either cut or mix into the headphones.
While the talkback button is pressed, the switch is illuminated RED and
the talkback is active. The buttons work with both a momentary and
latched operation. If held down, the selection is cancelled when released,
otherwise the button is alternate action.
If necessary it is also possible to permanently route the talkback audio to
the talkback connector on the back panel irrespective of whether TALKBACK
or CUE/PFL & T/B have been pressed. This may be required if an additional
talkback routing panel is used to route talkback to multiple locations.
Mute
The red mute LED will illuminate whenever a mic channel, which has been
designated to Control Room mute, goes live. This will mute the control
room monitors to prevent feedback. Two pairs of contacts on the remote
connector of the PGM output channel will close whenever the mute
function is active. These can be used to remotely illuminate “Mic Live”
lights.
Fig 2-26: Level controls