Sonifex S2-MSB1 Manual

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S2 Digital I/O Analogue

Radio Broadcast Mixer

User Handbook

S2 User Handbook

Revision 2.21 February 2020

©Sonifex Ltd, 2000-2020

Sonifex Ltd, 61, Station Road, Irthlingborough,

Northants, NN9 5QE, England.

Tel : +44 (0)1933 650 700

Fax : +44 (0)1933 650 726

Email : sales@sonifex.co.uk or technical.support@sonifex.co.uk

Web : 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 Sonifex Ltd. Sonifex Ltd shall not be liable for any loss or

damage whatsoever arising form 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, or 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 products.

For the latest Sonifex handbook information please visit the Sonifex website at

www.sonifex.co.uk

S2 User Handbook

CO N T E N T S

CON TEN TS

Warranty & Safety Information i

Warranty and Liability i

Returning the Warranty Card iii

Unpacking the S2 iii

Safety of Mains Operated Equipment iv

Fuse Rating iv

Power Cable and Connection iv

WEEE & RoHS Directives - Sonifex Statement v

Reporting Faults vi

1 Introduction 1

Innovative Design 1

Superb Audio Quality and Unquestionable Reliability 3

Features 3

2 Installation Notes 4

Atmosphere 4

Electromagnetic Radiation 4

Dimensions and Cut-Out Sizes 4

Channel Conguration 5

Connectors and Cabling 5

System Block Diagrams 9

Applications 11

Removing & Replacing Channels 13

Connecting A Split Desk 14

3 Power Supply 16

S2-PSU Power Supply (Old Version) 16

Front Panel 16

Rear Panel 17

Safety of Mains Operated Equipment 17

Ordering the Correct Mains Lead 18

Power Cable and Connection 18

Fuse Rating 18

S2-PSU Power Supply (New Version) 19

Front Panel Indicators 21

Rear Panel 22

4 Input Channels 25

S2-CML Mic/Line Input Channel 25

S2-CMM Mic/Mic Input Channel 25

S2-CS Dual Stereo Line Input Channel 25

S2-CSE Dual Stereo Line Input with EQ Channel 26

S2-CSG Stereo Line with Gram Input Channel 26

S2-CDS Digital Dual Stereo Input Channel 26

S2-CDSE Digital Dual Stereo Input with EQ Channel 26

S2-C6SS 6 Way Stereo Line Source Select Channel 26

S2-CT Telco Input Channel 26

S2-CSMM Stereo Mix-Minus Channel 27

S2-PG S2 Penny & Giles Conductive Plastic Fader 27

5 S2-CML Mic/Line Channel With EQ 28

Panel Controls 28

Rear Panel 29

Channel Options, Jumper Settings and Presets 30

S2 User Handbook

CON TEN TS

CO N T E N T S

6 S2-CMM Mic/Mic Channel With EQ 36

Panel Controls 36

Rear Panel 37

Channel Options, Jumper Settings and Presets 38

7 S2-CSE/S2-CS Dual Stereo Line Channel With & Without EQ 43

Panel Controls 43

Rear Panel 44

Channel Options, Jumper Settings and Presets 45

8 S2-CSGE/S2-CSG Stereo Line And Gram Channel With & Without EQ 52

Panel Controls 52

Rear Panel 53

Channel Options, Jumper Settings and Presets 54

9 S2 -CDSE/S2-CDS Digital Dual Stereo Line Channel With & Without EQ 61

Panel Controls 61

Rear Panel 62

Channel Options, Jumper Settings and Presets 63

10 S2-C6SS 6 Way Stereo Line Source Select Channel With EQ 70

Panel Controls 70

Channel Options, Jumper Settings and Presets 72

11 S2-CT Telco Channel With EQ 76

Panel Controls 76

Rear Panel 77

Channel Options, Jumper Settings and Presets 78

12 S2 CSMM Stereo Mix Minus Channel With EQ 83

Panel Controls 83

Rear Panel 84

Channel Options, Jumper Settings and Presets 85

13 Output Channels 92

S2-ODP Digital PGM Output Channel &S2-ODPF Digital PGM Output Channel

With Master Fader 92

S2-ODA Digital AUD Output Channel & S2-ODAF Digital AUD Output Channel

With Master Fader 92

S2-OMC Control Room Monitor Channel 92

S2-OMS Studio Monitor Channel 93

14 S2-ODPF/S2-ODP Digital Output PGM Channel With & Without

Master Fader (Version 1) 94

Panel Controls 94

Rear Panel 95

Channel Options, Jumper Settings and Presets 96

15 S2-ODPF/S2-ODP Digital Output PGM Channel With & Without

Master Fader (Version 2) 101

Panel Controls 101

Rear Panel 102

Channel Options, Jumper Settings and Presets 103

S2 User Handbook

CON TEN TS

CO N T E N T S

16 S2-ODAF/S2-ODA Digital Output AUD Channel With & Without

Master Fader (Version 1) 108

Panel Controls 108

Rear Panel 109

Channel Options, Jumper Settings and Presets 110

17 S2-ODAF/S2-ODA Digital Output AUD Channel With & Without

Master Fader (Version 2) 115

Panel Controls 115

Rear Panel 115

Channel Options, Jumper Settings and Presets 117

18 S2-OMC Control Room Monitor Channel 122

Panel Controls 122

Rear Panel 123

Channel Options and Jumper Settings 124

19 S2-OMS Studio Monitor Channel 128

Panel Controls 128

Rear Panel 129

Channel Options and Jumper Settings 130

20 Meterbridge Modules 134

Meterbridge Module Types 134

Meterbridge Distribution Board 135

S2-MB1-5 Meterbridge Blanking Plates 136

S2-ML Meterbridge Loudspeaker Monitor Panel 136

S2-MVU Meterbridge VU Meter Panel, S2-MPPM PPM Meter Panel

& S2-ML53 LED Meter Panel 137

S2-MPH Meterbridge Phase Meter Panel 139

S2-MTB6 Meterbridge 6 Way Talkback Panel 140

S2-MTBS Meterbridge Station Master Talkback Panel 141

S2-MSB1 Meterbridge Switch Panel With 1 Button 145

S2-MSB3 Meterbridge Switch Panel With 3 Buttons 145

S2-MT Meterbridge Timer Panel 146

Overview 146

Panel Controls 146

Rear Panel 147

Conguring The Timer 147

21 Technical Specications 152

S2 Mixer Weights and Boxed Dimensions 154

Glossary 155

S2 User Handbook

F I G U R E S

FI GU RES

Figures

Fig 1‑1 : S2‑15 Chassis Complete with

Channels. 1

Fig 1‑2 : S2‑7SS Script Space. 2

Fig 2‑1 : Mixer Prole. 4

Fig 2‑2 : Mixer Cut‑Out Details. 5

Fig 2‑3 : XLR Connectors. 6

Fig 2‑4 : RCA Phono Connector. 6

Fig 2‑5 : BNC Connector. 6

Fig 2‑6 : 1/4” Jack Connectors. 7

Fig 2‑7 : 9 Pin & 15 Pin D‑Type

Connectors. 7

Fig 2‑8 : 25 Pin D‑Type Connectors. 8

Fig 2‑9 : 9 Pin D‑Type Power Connectors. 8

Fig 2‑10 : System Block Diagram

(Sheet 1). 9

Fig 2‑11 : System Block Diagram

(Sheet 2). 10

Fig 2‑12 : Using the Sonifex RB‑LC3 to

control an On‑Air Light. 11

Fig 2‑13 : Mixer Bus Cable Slots. 14

Fig 2‑14 : Mixer Bus Cable Screen

Connection. 14

Fig 2‑15 : Cable & Channel Connection. 15

Fig 2‑16 : Meterbridge Interconnection. 15

Fig 3‑1 : S2‑PSU Front Panel. 16

Fig 3‑2 : S2‑PSU Rear Panel. 16

Fig 3‑3 : New S2‑PSU Front Panel. 19

Fig 3‑4 : New S2‑PSU Rear Panel. 20

Fig 3‑5 : S2‑PSUS Front Panel. 21

Fig 3‑6 : S2‑PSUS Rear Panel. 22

Fig 3‑7: New S2‑PSU Diagram. 24

Fig 5‑1 : S2 Mic/Line Input Board

Layout. 32

Fig 6‑1 : S2 Mic/Mic Input Board

Layout. 40

Fig 7‑1 : S2 Dual Stereo Input With &

Without EQ Board Layout. 46

Fig 8‑1 : S2 Stereo Line & Gram With &

Without EQ Board Layout. 55

Fig 9‑1 : S2 Digital Dual Stereo Input

Board Layout. 64

Fig 10‑1 : S2 6 Way Source Selector

Board Layout. 73

Fig 11‑1 : S2 Telco Input Board Layout. 79

Fig 12‑1 : S2 Stereo Mix‑Minus Board

Layout. 86

Fig 14‑1 : S2 Digital PGM Output Board

Layout. 97

Fig 14‑2 : S2 Digital PGM Output With

Fader Board Layout. 98

Fig 15‑1 : S2 Digital PGM Output Board

Layout. 105

Fig 15‑2 : S2 Digital PGM Output With

Fader Board Layout. 105

Fig 16‑1 : S2 Digital AUD Output Board

Layout. 111

Fig 16‑2 : S2 Digital AUD Output With

Fader Board Layout. 112

Fig 17‑1 : S2 Digital AUD Output Board

Layout. 118

Fig 17‑2 : S2 Digital AUD Output With

Fader Board Layout. 118

Fig 18‑1 : Control Room Monitor Board

Layout. 124

Fig 19‑1 : Studio Monitor Board

Layout. 130

Fig 20‑1 : Meterbridge Distribution Board

Layout. 135

Fig 20‑2 : Blanking Plate. 136

Fig 20‑3 : Loudspeaker Monitor Panel. 136

Fig 20‑4 : PPM & True PPM Meter Panel. 137

Fig 20‑5 : VU Meter Panel. 137

Fig 20‑6 : VU & PPM LED Meter Panel. 138

Fig 20‑7 : Phase Meter Panel. 139

Fig 20‑8 : Meterbridge 6 Way Talkback

Panel. 140

Fig 20‑9 : Meterbridge Station Master

Talkback Panel. 141

Fig 20‑10a : S2‑M6SS Panel. 143

Fig 20‑10b : S2‑M6SS Diagram. 144

Fig 20‑11a : S2‑MSB1 S2 Meterbridge

Switch Panel With 1 Button. 145

Fig 20‑11b : S2‑MSB1 Diagram. 145

Fig 20‑12a : S2‑MSB3 S2 Meterbridge

Switch Panel With 3 Buttons. 145

Fig 20‑12b : S2‑MSB3 Diagram. 145

Fig 20‑13 : Meterbridge Timer Panel. 146

S2 User Handbook i

WAR R A N TY & S A F ETY

I N F O RMAT I O N

WARRANTY & SAFE TY INFORMATION

Warranty & Safety Information

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.

ii S2 User Handbook

WA R R A N TY & S A F E TY I N F O R M AT I O N

WA R R A N T Y & S A F E T Y

I N F O R M AT I O N

(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.

(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.

iv S2 User Handbook

WARRANTY & SAFE TY INFORMATION

WAR R A N TY & S A F ETY

I N F O RMAT I O N

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.

The power supply is rated to 95 ‑ 265VAC at 47 – 63Hz with a fuse of 2A.

Warning: There are no user serviceably parts inside the machine. If you should ever

need to look inside the unit, always disconnect the mains supply before removing the

equipment covers.

Fuse Rating

The product is supplied with a single fuse in the live conducting path of the power‑in feed

at the power supply. 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.

Power Cable and Connection

An IEC power connector is supplied with the product, which has a moulded plug attached –

this is a legal requirement. If no moulded plug has been supplied with your product, please

contact your supplier, because an IEC connector is always supplied from the

Sonifex factory.

If for any reason, you need to use the product 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)

S2 User Handbook v

WA R R A N TY & S A F E TY I N F O R M ATI O N

WA R R A N T Y & S A F E T Y

I N F O R M AT I O N

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.

vi S2 User Handbook

Reporting Faults

Although this Sonifex product is manufactured to the highest standards, it is possible that

minor faults may appear in the equipment over its normal lifetime. If you nd any problems

with the product, please contact your Sonifex distributor, or contact Sonifex directly at the

following address, or fax with a copy of this completed sheet :

To : From:

Sonifex Ltd, Name

61, Station Road, Position

Irthlingborough, Company

Northants. Address

NN9 5QE, UK

Tel : +44 (0)1933 650 700 Tel

Fax : +44 (0)1933 650 726 Fax

Email : technical.support@sonifex.co.uk Email

For the Serial No. of your machine, see the

back panel of the unit.

Serial No.

Please describe the error in as much detail as possible (for example what you were doing

when the problem occurred, what actually happened, etc)

Description of Error

Also, if you have any suggestions for additions or upgrades to the unit , we would like to

hear what they are :

Additions that I Would Like to See

R E P OR TI N G A FAU LT

RE POR TIN G A FAU LT

S2 User Handbook 1

I N T R O D U C T I O N

1 Introduction

S2 is a new breed of radio broadcast mixer. Using the latest technology components,

S2 oers digital audio quality with analogue reliability in a modular format. S2 has both

digital and analogue input channels, together with simultaneous analogue and digital

outputs.

Following on from the Sovereign range of audio mixers, S2 combines all the features needed

of a radio broadcast mixer in a stylish, ush‑mounting chassis: a wide range of input and

output channels, PFL/Cue, fader‑start operation of equipment, automatic monitor muting

on mic‑live, light switching remote outputs, optional EQ on input modules, gram amp input

options and 2 main audio buses, allowing you to broadcast on the PGM bus while recording

on the AUD bus, with bus output selection on each module.

Fig 1‑1 : S2‑15 Chassis Complete with Channels.

Innovative Design

• The S2 chassis is available in 5 channel width sections, allowing 5, 10, 15, 20, 25

and 30 channel width mixers. This means S2 can be used for small newsrooms or large

on‑air situations. The following table shows the model number along with the total

channel width.

Model No. Number of Channels Model No. Number of Channels

S‑05 5 S‑20 20

S‑10 10 S‑25 25

S‑15 15 S‑30 30

2S2 User Handbook

I N T R O D U C T I O N

• The Script Space (S2‑7SS) occupies an area of 7 channel widths, and is designed to

hold documents/scripts for the mixer operator when desk space is at a premium. It

is most commonly placed in the centre of the mixer, although it can be positioned

anywhere within the mixer chassis. It has a hole in the rear of the front section to allow

a keyboard/mouse cable to pass through and a 10 channel Script Space (S2‑10SS), is

also available.

Fig 1‑2 : S2‑7SS Script Space.

• Blank channels (S2‑CB) can be used to ll spaces in the chassis not occupied by

active channels.

• Modular “pop‑up” input and output channels means that the mixer can be maintained

simply and quickly. Input channels can be individually removed and repaired whilst

still on‑air.

• The angle of the meterbridge can be varied and set for best viewing position.

• Any channel can be in any position so that customizing the mixer for your own

purposes is easy.

• Large backlit buttons allow you to see the status of the mixer at all times.

• The tted rear panel hides all cable connections but can be simply removed for

maintenance.

• The modular design of the desk gives you the exibility to expand it at a later date.

You can even add another S2 mixer and link them together with a bus connector

cable to allow for split desk congurations.

S2 User Handbook 3

I N T R O D U C T I O N

Superb Audio Quality and Unquestionable Reliability

• The S2 uses the latest Crystal semiconductor technology to allow input and output of

digital audio signals up to 24 bit, 96kHz sample rate.

• 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 S2 minimizes the chance of failure, avoiding

lost air‑time. Each channel is individually checked twice before being assembled into

the nished chassis and the whole unit is tested before shipping.

• ALPS long throw 100mm faders give a smooth, repeatable response and the Neutrik

XLR connectors used are an industry standard.

• The use of VCAs controlled by the faders ensures tight stereo tracking and eliminates

mechanical and electronic noise.

• S2 has a separate 1U power supply providing regulated, ripple‑free power to

the mixer.

• High quality stainless steel is used for the chassis and screws to prevent corrosion in

high humidity environments.

Features

• Fully modular build with six dierent frame sizes available.

• Optional script space.

• Digital and analogue inputs.

• Digital and analogue PGM and AUD outputs as standard.

• Mono analogue output.

• True cleanfeed output on each telco input.

• Stereo cleanfeed channel available.

• VCA faders.

• VU and PPM metering.

• Optional master faders on outputs for production use.

• Dual digital timers with real time clock.

• Separate control room and studio monitor channels.

• Optional RIAA inputs for dual stereo channel.

4S2 User Handbook

2 Installation Notes

Atmosphere

The S2 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 S2 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. The S2 power supply should also

be sited at least 1 metre from the mixer.

In all cases the S2 mixer and power supply should be installed and serviced by qualied

personnel.

Dimensions and Cut-Out Sizes

The S2 mixer consists of a stainless steel chassis with plastic side and top mouldings and

aluminium front trim. The dimensions for the mixer below include the mouldings and trim.

The cut‑out size is for reference only and should be checked with your mixer.

Fig 2‑1 : Mixer Prole.

I N S TA L L AT I O N N OT E S

INSTALLATION NOTES

117mm

505mm 521mm

565mm

180mm

23mm

10mm

Mounting Holes 5mm Diameter

7°

S2 User Handbook 5

Fig 2‑2 : Mixer Cut‑Out Details.

Channel Conguration

Each of the channels can be re‑congured by jumpers, which are displayed in the “Channel

Options and Jumper Settings” section of each chapter. You should ensure that you are

thoroughly familiar with the settings available for each channel before attempting

installation of the mixer. This is because some options may involve moving jumpers on

several channels to change the conguration of the mixer.

Connectors and Cabling

Many of the problems associated with installing and maintaining a mixing console are due

to the use of poor cables or faulty connections. It is recommended that, wherever possible,

pre‑wired cables are purchased from recommended manufacturers. If you need bespoke

cables making, please ensure that a qualied engineer carries out the work.

I N S TA L L AT I O N N OT E S

INSTALLATION NOTES

196mm S2-5

387mm S2-10

577mm S2-15

768mm S2-20

958mm S2-25

1149mm S2-30

Woodwork

Front Edge

506mm

40mm

276mm

Woodwork

Rear Edge

6S2 User Handbook

The main types of connectors used with the S2 mixers are the following:

XLR 3 Pin Connectors

The following diagram shows the pin details for the 3 pin XLR sockets and plugs:

Fig 2‑3 : XLR Connectors.

RCA Phono Connector

This connector is used on the Stereo Gram Channel and the S/PDIF inputs on the digital

input/output channels.

Fig 2‑4 : RCA Phono Connector.

BNC Connector

This connector is used for the Word clock inputs on the PGM and AUD output channels.

Fig 2‑5 : BNC Connector.

I N S TA L L AT I O N N OT E S

INSTALLATION NOTES

Pin 2. Hot (In Phase) Signal

Pin 1. Ground (Screen) Signal

Pin 3. Cold (Out Of Phase) Signal

3 Pin Socket

(Female)

Line, Mic &

AES/EBU Inputs

C/F, L/R Stereo &

AES/EBU Outputs

3 Pin Socket

(Male)

Pin 2. Hot (In Phase) Signal

Pin 1. Ground (Screen) Signal

Pin 3. Cold (Out Of Phase) Signal

Inner

. Hot (In Phase) Signal Outer. Ground (Screen) Signal

Gram & S/PDIF

Inputs

RCA Phono

(Female)

Inner

. Hot (In Phase) Signal Outer

. Ground (Screen) Signal

Word Clock

Inputs

BNC (Female)

S2 User Handbook 7

6.35mm ‘A’ Gauge Stereo Jack Plugs

‘A’ Gauge Stereo Jack Plugs can be connected as follows:

Fig 2‑6 : 1/4” Jack Connectors.

D Type Connectors

Several dierent D type connectors are used on the S2. A 9 pin plug is used for the remotes

on input channels and external inputs on monitor channels. A 15 pin socket is used for the

analogue outputs and mute relays on the output channels. A 25 pin socket is used for the

audio inputs, and a 25 pin plug for the remotes, on the 6 way stereo select channel. A 9 pin

plug & socket is used for the power connections from the PSU to the mixer.

Fig 2‑7 : 9 Pin & 15 Pin D‑Type Connectors.

I N S TA L L AT I O N N OT E S

INSTALLATION NOT ES

Tip - Left Signal

Ring - Right Signal

Sleeve - Ground (Screen) Signal

Tip - T/B Signal

Ring - Control Signal (T/B In)

Sleeve - Common

¼“ ‘A’ Gauge Stereo Jack Plug used for T/B in and T/B Out

¼“ ‘A’ Gauge Stereo Jack Plug

used for Headphones and Monitors

9 Pin D-Type Plug used

for Remotes and Ext Inputs

Pin 6 Pin 15 Pin 8

Pin 1

Pin 9

Pin 5

15 Pin D-Type Socket used for Analogue

Outputs and Mute Relays

8S2 User Handbook

Fig 2‑8 : 25 Pin D‑Type Connectors.

Fig 2‑9 : 9 Pin D‑Type Power Connectors.

Pin 14

Pin 1

Pin 1Pin 13

Pin 13

Pin 25

25 Pin D-Type Plug

used for Audio Inputs

25 Pin D-Type Socket

used for Remotes

Pin 1

Pin 5

Pin 1

Pin 5

9 Pin D-Type Plug used

for Power Connections

9 Pin D-Type Socket used

for Power Interconnect Cable

I N S TA L L AT I O N N OT E S

INSTALLATION NOTE S

S2 User Handbook 9

System Block Diagrams

Fig 2‑10 : System Block Diagram (Sheet 1).

I N S TA L L AT I O N N OT E S

INSTALLATION NOTES

PGM EQ

MIC

LINE CUE

PFL

AUD

AUD PFL T/B

MIC

GAIN

48V TRIM

LINE

TRIM

PAN48V

MIC

LINE

MIC

INSE

SEND

INSE

RETURN

MIC CUE LIGHT

LINE REMOTES

COUGH/REV T/B T/B ENABLE

LINE

INSERT

HF/LF

CPU

VCA

FADER

ROUTING

PFL

TO LEFT

PGM OUTPUT

TO RIGHT

PGM OUTPUT

BUS

TO TIMER

TO METER

SELECT

PGM

L R L R L R 1 2 1 2

MUTES

C/FEED

INPUT

TRIM

PAN

CLEANFEED

SELECTION

AND ROUTING

INPUT

C/FEED

OUTPUT

HYBRID

LATCH

HF/LF

CPU

PGM EQ CUE

T/B

AUD

VCA

FADER

NULL

ROUTING

PFL

PFLTO

METER SELECT

TO TALKBACK

OUTPUT

LFROM AUD

OUTPUT

MIX BUS

L R L RL R 1 2 1 2

MUTES

PGM AUD PFL T/BC/FEED

2 3

NULL

INPUT

SELECT

INPUT

LINE LEFT

INPUT

1 REMOTES

INPUT

2 REMOTES

INPUT

ES/EBU

INPUT

ES/EBU

INPUT

LINE RIGHT

INPUT

LINE LEFT

INPUT

LINE RIGHT

INPUT 1

INPUT 2

SPDIF

INPUT 2

RIAA

OPTION

LEFT

TRIM

LEFT

TRIM

RIGHT

TRIM

RIGHT

TRIM

D/A

AES/SPDIF

DIGITAL INPUT VERSION

LINE 1/2

NULL

6 x STEREO

BAL INPUTS LEFT INPU AMPT

RIGHT INPUT AMP

6 INPUTWAY

AND REMOTE

OUTPUT SELECTOR

6 x REMOTE

START/STOP

C / FEED

LEFT

C / FEED

RIGHT

STEREO MIX-MINUS VERSION

STEREO SELEC R VERSIONTO

TRIM

BAL

HF/LF

CPU

PGM EQ CUE

PFL

AUD INP 1

INP 2

VCA

FADER

ROUTING

PFL

PGM

TO S2-OMC

S2-OMS CPU

FROM PGM

OUTPUT L

FROM PGM

OUTPUT R

L R L R L R 1 2 1 2

AUD PFL T/B

MUTES

C/FEED

Input Channels Diagram - CMM & CML

Input Channel Diagram - CT Telco

Input Channels Diagram - CSG,CSGE,CS,CSE,CDS,CDSE, and CSMM C6SS

10 S2 User Handbook

Fig 2‑11 : System Block Diagram (Sheet 2).

I N STA L L AT I O N N OT E S

IN STALLATION NOTE S

Output Channels Diagram - ODP,ODPF,ODA, and ODAF

FROM LEFT

PGM BUS

ANALOGUE PGM

(AUD) OUTPUT LEFT

ANALOGUE PGM

(AUD) OUTPUT

RIGHT

ANALOGUE MONO

OUTPUT

AES/EBU PGM

(AUD) OUTPUT

SPDIF PGM

(AUD) OUTPUT

SPDIF SYNC

AES/EBU SYNC

WORDCLOCK

FROM RIGHT

PGM BUS

FROM CPU

FROM

MUTES BUS

FROM L&R

PFL

BUS

FROM

ALKBACK

BUS

AES/SPDIF

OUTPUT

SELECT

METER

SELECT

A/D

CPU

PGM

AUD

MON

S2-ODP ONLY

DIGITAL

AUDIO

INTERFACE

AES/SPDIF

METERBRIDGE

FADER OPTION

L R L RL R 1 2

PGM

O/P

AUD

O/P

PFL

O/P

T/B

O/P

TIMERS

REV T/B

2 33

S2-CT

TELCO

CLEANFEED

SELECTION

L&R

EXTERNAL

INPUTS

C/ROOM/

STUDIO

MONITORS

PRES/STUDIO

HEADPHONES

REV T/B

TALKBACK

OUTPUT

FROM MUTES

BUS

CPU

PGM

AUD

EXT 1

EXT 2

AUTO

CUE

AUTO

CUE

SPLIT

CUE

STUDIO

T/B

TO MONITOR METERS

STUDIO C/ROOM

LEVEL

CUE/PFL MUTE/

DIM LKBACKTA

GLOBAL T/B

L R L RL R 1 2

PGM

O/P

AUD

O/P

PFL

O/P

T/B

O/P

TIMERS

REV T/B

CLEANFEED

LEFT

(S2-CSMM)

CLEANFEED

RIGHT

(S2-CSMM)

PFL METERS PHASE METER

PGM METERS

CUE/PFL

TALKBACK

LOUDSPEAKER

MONITOR METERS

S2-MPPM DUAL PPM METER PANEL

S2-MPPT TRUE DUAL PPM METER PANEL

S2-MVU DUAL VU METER PANEL

S2-ML53 DUAL LED BAR GRAPH METER

S2-MPH PHASE METER PANEL

CUE/PFL REV T/B

REV T/B

S2-ML

S2-MT

DUA TIMER, CLOCK AND DATE DISPLAYL

FROM MONITOR OUTPUT

L R L RL R 1 2

PGM

O/P

AUD

O/P

PFL

O/P

T/B

O/P

TIMERS

REV T/B

MODERESET

START

STOP

MODERESET

START

STOP

Output Channels Diagram - OMS and OMC

Meterbridge Diagram - MPPM/T, PPM, MVU, VU, ML53, MPH, MTBS, MTB6, MT, and ML

S2 User Handbook 11

Applications

This section of the handbook provides examples of how to congure the dierent types of

modules for typical applications:

Controlling an On-Air Light Using the Output Modules

The On‑Air light, also known as Mic Live, is used to indicate to everyone inside or outside of

the Control Room and/or Studio that microphones are live and on‑air.

Two sets of latching relay contacts, activated by a control room mute, are available on the

15 way D type socket on the rear panel of the PGM and AUD modules for the Control Room

On‑Air light and Studio On‑Air light respectively. See the Remote Connector pin‑outs of the

relevant modules for details.

Shown below is an example of connecting one of the latching relay contacts on the PGM or

AUD modules to a Sonifex RB‑LC3. The remote connection on the RB‑LC3 is active low.

Fig 2‑12 : Using the Sonifex RB‑LC3 to control an On‑Air Light.

Controlling a Mic Cue Light using the Input Modules

The mic cue light is used to indicate to a guest, etc, situated in a talks studio, that they

should speak. The cue light is usually green, and there is usually one per microphone. This

should not be confused with a mic live light, which is red and there is one per studio or

control room, also known as “On Air light” (see above).

Opto‑isolated outputs for a mic cue light are provided on the remote connectors of the Mic/

Mic and Mic/Line modules. See the Remote Connector pin‑outs of the relevant modules for

details.

NOTE: It is vital that mains voltages are connected to any of the connectors NOT

on the mixer. If your On-Air light is to be mains operated then you should use a suitable

opto-isolated solid-state mains relay. The Sonifex Redbox RB-LC3 Light/Power controller

is a suitable unit that will control up to three On-Air lights and/or Mic cue lights.

Pin 7

Pin 14

Pin 2

Mains

Output 1

Lamp

Remote External

Control Inputs

PGM or AUD Output Module

D-Type Outputs

& Remote Connectors RB-LC3

Pin 14

I N STA L L AT I O N N OT E S

IN STALLATI ON N OTES

12 S2 User Handbook

Enabling Talkback On Mic Modules

Talkback is used for o‑air communication between studios, or between the Presenter,

the Studio guests and callers on the telephone line. The presenter’s microphone module

can be congured to be the talkback source to the studio guests and telephone callers

by connecting pin 9 to pin 7 on the presenters Mic/Mic or Mic/Line modules remote

connector. This talkback audio also appears on the talkback output connector on the control

room monitor module as a continuous feed. It can be used for routing talkback to other

destinations.

Cough Switch and Talkback On Mic Modules

A cough switch is used to momentarily mute the output of a live microphone channel

when you wish to clear your throat. Closing pin 8 to pin 7 on a Mic/Mic or Mic/Line modules

remote connector performs the cough function when the module is live, i.e. when the

mic input is selected, the channel is routed, the channel is ON and the fader is up. This

function can be used for the presenters mic but is more usually only provided for the studio

microphones.

The cough switch performs the function of talkback to the presenter when the module is

not live. In this case, when a studio guest presses his cough switch the microphone module

is put in to PFL, which routes the pre fade mic signal to the control room monitoring where

it can be heard by the presenter via his headphones or monitor loudspeakers. The presenter

can talk back to the studio by using the Studio T/B button situated on the studio monitor

module. For the presenter to hear the talkback from the studio automatically, either or both

the control room monitor loudspeakers and the headphones should be set to Auto Cue/

PFL. While the Cough switch is enabled, if PGM and/or AUD are enabled then they will ash

quickly to indicate that Cough is enabled.

Using Voice Processors On Mic Channels

The Insert point on Mic input channels is useful for hooking up an outboard eects unit

to be used with the microphone, for example, a voice processor. The insert send signal

is always available as a line level balanced output. The insert return signal is enabled by

placing jumper J10 on the channel, over pins 1 & 2. The insert return function is disabled in

Line mode except when jumper J5, Mic on Line Input, is set.

Remote Start and Stop

When an input module is being used in line mode (e.g a Mic/Line on input 2 or a Dual Stereo

module) it is usually necessary to control external equipment by means of the remote start

and stop functions. See the relevant modules for pin out details.

If your equipment has a remote facility for “Fader Start” then this normally requires a

latching contact to start, opening the contact will cause the equipment to stop. In this case

it is only necessary to use the start remote, but you will need to make the contact latching

by setting a jumper (See the relevant module for jumper settings).

I N STA L L AT I O N N OT E S

IN STALLATION NOTE S

S2 User Handbook 13

If your equipment has remote facilities for “Play”, “Stop”, “Re‑Cue”, it will be necessary to

use both start and stop remotes. In this case you will need a momentary start. It should be

noted that pins 2 & 5 on the input modules remote connector is common to start and stop

and should be connected to the common pins on your equipments remote connector. Pins

1 & 4 on the remote should be connected to the “Play” pins on your equipment, and pins 3 &

6 should be connected to the “Stop” pins. Sometimes it may be useful to connect the mixer

stop remote to the “Re‑Cue” pin.

Adding Telco Channels

When adding a Telco channel to the mixer there are certain requirements that need to be

met for the correct operation of the cleanfeed buses. Depending on whether you have 1,

2 or no telco channels tted, you may have to alter the cleanfeed bus termination on the

digital PGM and AUD Output channels. If the console is supplied without Telco channels

then both cleanfeed mix buses will need to be terminated. With one Telco channel, only the

unused cleanfeed bus will require termination. With two Telco channels no termination is

required. Please refer to that section of the handbook for further info.

The jumpers J11 and J12 on the Telco channel determine which of the two true cleanfeed

buses the channel uses. There can only be a maximum of two telco channels in each mixer

and they must not share a cleanfeed bus. If you have only one telco channel, the jumpers

are tted over pins 1 & 2 of J11, using cleanfeed bus 1. If a second telco channel is present in

the mixer, then this second channel will have the jumpers tted over pins 2 & 3 of J12, using

cleanfeed bus 2 only.

Removing & Replacing Channels

When installing the mixer it may be necessary to change certain characteristics of a channel

to suit your specic needs, e.g. jumper settings, internal gain pots, etc. To do this the channel

must be removed from the chassis to gain access to the jumpers and pots. Particular care

must be taken when performing this procedure.

To remove a channel, rst disconnect any attached cables from the rear of the channel, and

remove the two screws from the front panel of the channel. The channel should now be

lifted slightly from the chassis with the aid of springs situated at the two xing points, with

enough room to grab both ends of the channel, so that you can carefully lift it from the

chassis. Be careful not to lay the channel across the mixer, as the underside of the channel

PCB may cause scratching.

Once the necessary changes have been made, ensure that the main bus cable is still rmly

attached and carefully position the channel directly above the space where it was removed

from, holding it at a tilt, so that the fader end of the mixer will make contact with the

chassis rst. Slowly lower it down into the mixer, making sure that the main bus cable is

formed correctly and the slack does not get trapped beneath the channel. Once the fader

end has made contact, continue lowering the rear end of the channel down until that also

makes contact, ensuring that it is ush with the channels beside it. Replace the screws, and

reattach the cables to the rear of the channel.

IN STALL ATI ON N OTES

I N STA LL ATI O N N OT E S

14 S2 User Handbook

Connecting A Split Desk

There are three cables used when connecting an S2 mixer split desk conguration. A 16

way IDC cable which connects the two meterbridge distribution boards, A 60 way jacketed

IDC cable which connects the two main mixer bus cables and an earth braid cable which

connects the two chassis’. When shipped, these three cables will already be attached to

one of the mixers and will require attaching to the other mixer. The procedure to do this is

described below.

Connecting The Mixer Bus Interconnect Cable

On the under side of the mixer chassis are two slots at each end. These are where the

mixer bus interconnect cable feeds through (Fig 2‑13). The rst thing to do is to remove

the channel from the end of the mixer where the cable is going to be connected. If the

interconnect cable is to be connected to the left handside mixer then this will be the right

most channel of the mixer. If the interconnect cable is to be connected to the right handside

mixer then this will be the left most channel.

Fig 2‑13 : Mixer Bus Cable Slots.

Once the channel has been removed,

pull the cable through the slot making

sure that the cable has not twisted

coming from the rst mixer. Pull it

through so that about 2 inches (5 cm) of

the cable jacketing is inside the chassis.

Connect the screening wire to one of

the clamping plate screws and screw in

the plate to the underside of the chassis

to secure the cable, and stop it from

moving (Fig 2‑14).

Fig 2‑14 : Mixer Bus Cable Screen Connection.

I N STA L L AT I O N N OT E S

IN STALLATION NOTES

S2 User Handbook 15

Then loop the cable back over itself and connect the 60 way IDC plug to the main mixer

bus (Fig 2‑15). Now reconnect the channel that was removed, to the free 60 way IDC socket,

using the procedure described on page 13 for removing and replacing channels.

Fig 2‑15 : Cable & Channel Connection.

Connecting The Meterbridge Interconnect Cable

To connect this cable some of the panels on the meterbridge will require removing to locate

the meterbridge distribution board. Once located, nd the IDC header labelled on the

distribution PCB as “From Output Module”. At the back of the mixer chassis there is a slot just

above where the output modules sit. Feed the Meterbridge Interconnect cable through the

slot and plug it into the header. Once this has been done, replace the meterbridge panels

that were removed earlier to locate the distribution board.

Fig 2‑16 : Meterbridge Interconnection.

Connecting The Earth Braid

As with the other cables, this will already be connected to one of the split desks. Simply

connect the other end of the cable to the other desk, by unscrewing the outer M4 nut and

removing the shakeproof washer. Then place the solder tag of the earth braid cable on the

bolt and then replacing the shakeproof and M4 nut.

I N STA L L AT I O N N OT E S

IN STALLATION NOTES

16 S2 User Handbook

3 Power Supply

S2-PSU Power Supply (Old Version)

Each S2 is shipped with a separate power supply 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.

Fig 3‑1 : S2‑PSU Front Panel.

Front Panel

The S2‑PSU is a 2U high rack‑mount unit, which can supply power to the entire range of S2

mixers. A lead with a special 9 pin D‑Type socket (see Fig 2‑9) on each end is used to connect

the power supply to the mixer.

The power supply should be installed where there is adequate ventilation for heat to

circulate from the rear of the unit. The mixer has a heat sink attached to the rear panel,

which radiates some heat.

Four LED’s on the front of the unit indicate whether the power to the four voltage rails is

being supplied correctly. If one of the LED’s fails, then there is a problem with the power

supply unit.

Fig 3‑2 : S2‑PSU Rear Panel.

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S2 User Handbook 17

Rear Panel

It is important to connect the mains supply in accordance with the information given.

Ensure that the rear panel mains voltage statement on the separate power supply indicates

that your equipment is suitable for your mains supply voltage and that the mains supply

fuse is correctly rated. The fuse as supplied is correct for the voltage setting.

The power cable supplied carries an EARTH conductor, which is connected internally to the

equipment chassis ground. This connection through a properly wired power Connector

is essential for safe operation. Disconnection of this earth connection may render the

Equipment unsafe, with a consequential possible electrical shock hazard from exposed

metallic parts.

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.

This equipment will operate in a horizontal position.

WARNING: The power must be switched o at the supply or the power lead must be

disconnected before attempting to remove the panels or cover. Removal of the panels

and cover can expose dangerous voltages. The cover is connected to the chassis ground

of the equipment by means of xing screws. It is essential to maintain this earth-ground

connection to maintain a safe operating environment.

In addition, to provide an Electromagnetic Shield, contact between the cover and the

chassis must be maintained when in use.

The power supply is switchable between 230V & 115V.

Warning: There are no user serviceably parts inside the machine. If you should ever

need to look inside the unit, always disconnect the mains supply before removing the

equipment covers.

The rear panel of the equipment carries the Serial Number of the machine. The operating

voltage of the S2 power supply is selectable at the fuse carrier on the power inlet port of the

S2‑PSU unit. Ensure that the machine operating voltage is correct for your mains

power supply.

P O W E R S U PP LY

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18 S2 User Handbook

Ordering the Correct Mains Lead

When ordering an S2 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

Power Cable and Connection

An IEC power connector is supplied with the S2, which has a moulded plug, attached – this

is a legal requirement. If no moulded plug has been supplied with your S2, please contact

your supplier, because an IEC connector is always supplied from the Sonifex factory.

The safety specication of your S2 power supply complies with local requirements and must

be earthed through the mains connector.

If for any reason, you need to use the S2 with a dierent power cable, you should use the

following wiring guidelines.

NOTE: The colours of the wires in the mains lead may not correspond with the coloured

markings identifying the terminals of your plug.

Wire Colour Connection

Green and Yellow wire: must be connected to the terminal marked with

E the colour green or green – yellow.

Blue wire: must be connected to the terminal marked N or

coloured black.

Brown wire: must be connected to the terminal marked L or

coloured red.

Fuse Rating

The S2 is supplied with a single fuse in the live conducting path of the power infeed at the

power supply. 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.

P O W E R S U P P LY

POWER SU PP LY

S2 User Handbook 19

Voltage Setting Fuse Rating

115V 3.15A (Anti‑surge – 20 x 5mm)

230V 3.15A (Anti‑surge – 20 x 5mm)

Power Connector

This 9 pin D type plug (see Fig 2‑9) is used to supply power to the Mixer, and has the

following connections;

Pin A1: +16V.

Pin A2: ‑16V.

Pin A3: 0V.

Pin A4: +VD.

Pin 1: +16V Sense.

Pin 2: ‑16V Sense.

Pin 3: 0V Sense.

Pin 4: +VD Sense.

Pin 5: +48V.

+VD: Digital power rail.

V Sense: Voltage level sensing signals.

Dimensions (S2-PSU)

(Raw): 48cm (W) x 24.3cm (D) x 8.8cm (H)

19” (W) x 10” (D) x 3.5” (H)

(Boxed): 51cm (W) x 41.5cm (D) x 17cm (H)

20” (W) x 16.3” (D) x 6.7” (H)

Weight (S2-PSU)

Nett: 6kg (13.2lbs) Gross: 7.8kg (17lbs)

S2-PSU Power Supply (New Version)

Fig 3‑3 : New S2‑PSU Front Panel.

The new 1U sized S2‑PSU is pin compatible with the original 2U sized S2‑PSU power

supply,so can be used as a straight like‑for‑like swap, using the same connection cables. The

new units have a serial number greater than 16852 and have a great deal of improvements

on the original design:

P O W E R S U PP LY

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20 S2 User Handbook

POWER SU PP LY

P O W E R S U P P LY

Increased power eciency, so that less power is drawn and therefore less heat generated.

An improved over‑current and over‑voltage protection system to give increased reliability

and stability.

A dynamically controlled quiet cooling fan which is only switched on when required by the

load conditions and temperature (greater than 50° C).

A new 1U chassis so it takes up less space in a 19” rack.

A fan failure indicator LED on the front panel so that in the unlikely event that the cooling

system should fail, a visible warning is given with the LED ashing red.

Fig 3‑4 : New S2‑PSU Rear Panel.

Important Notes:

Please note that connections to the mixer should be made before powering up the ALL

S2‑PSU, otherwise this could trigger the over‑current protection. If the over‑current

protection kicks in, then the unit needs to be powered down for approximately a minute to

reset the over‑current protection.

This 1U sized S2‑PSU is incompatible with S2‑PSUS power supply switchers with a serial

number of 16948 or earlier. The S2‑PSUS has been redesigned (from April 2011) to work

with both 1U and 2U S2‑PSU power supplies, but this is only for S2‑PSUS switchers with a

serial number higher than 16948. Contact Sonifex if you need to replace a 2U S2‑PSU and

are using an S2‑PSUS power supply switcher ‑ either a new version of the S2‑PSUS will be

required or a 2U S2‑PSU power supply will need to be specically requested.

The fan is started and run briey every few minutes to check that it is in operation and to

ensure that it doesn’t freeze through lack of use over time.

Dimensions (S2-PSU) 

(Raw): 48.3cm (W) x 23cm (D) x 4.4cm (H)

19” (W) x 9” (D) x 1.7” (H)

(Boxed): 51cm (W) x 41.5cm (D) x 17cm (H)

20” (W) x 16.3” (D) x 6.7” (H)

Weight (S2‑PSU) Nett: 2.9kg Gross: 4.3kg

Nett: 6.4lbs Gross: 9.5lbs

S2 User Handbook 21

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P O W E R S U PP LY

S2-PSUS Dual Power Supply Switcher

The S2‑PSUS is a passive power switcher which takes the power feeds from 2 x S2‑PSU

units and switches between them in the event of failure. Two trailing leads 0.5 m in length

connect to 2 x S2‑ PSU units. With LED failure indicators and GPI alarms the S2‑PSUS is the

perfect dual redundant power supply module.

Functionality

As an intelligent unit, the S2‑PSUS detects changes in the DC levels supplied to the S2.

A failure in any one of the +VD, +VE, ‑VE or +48V power rails, dened by calibrated limits,

results in switching to the secondary power unit. If the glitch was temporary and the

primary power unit recovers, the S2‑PSUS will switch back. Once it has switched back, the

unit has to remain stable for one minute for the power supply to be deemed stable again.

A failure count is incremented every time the unit returns and fails within the minute period.

Once three failures have occurred the rail is no longer used and the unit will only use the

secondary power supply. If the secondary power supply fails, the unit will enter ‘Joint Mode’

and attempt to complete the power rail set from the primary power supply. Again, if the

secondary power supply recovers, it is given a minute to stabilize. Three or more failures

on the same rail will result in a permanent failure to that rail. If the same rail fails in both

supplies, the unit will cut all power to the mixer except in the case of the phantom power

+48V rail.

Front Panel Indicators

Fig 3‑5 : S2‑PSUS Front Panel.

Two indicator LEDs on the front of the unit are used to display which power supply is

currently supplying the mixer. There are also eight LEDs that display the status for each of

the rails.

The LED will stay illuminated when the rail is stable. If the LED ashes quickly (1/4 second),

then the level is too high on that rail or if the LED ashes slowly (1/2 second), then the level

is too low on that particular rail. If the unit is in ‘Joint Mode’, then both active LEDS will be

on. In this case, if the same rails are good on both, the primary S2‑PSU will be supplying the

power for those rails.

22 S2 User Handbook

Resetting the S2-PSU States

The S2‑PSUS detects when a power supply has been removed or unplugged. If this occurs,

the S2‑PSUS assumes the power supply has been serviced and all failure statistics are

refreshed. If a rail has failed permanently, removing or unplugging the supply will allow the

rail to be fully tested again, once reinstated. Removing both power supplies will reset the

S2‑PSUS, indicated by the alternating front led sequence.

Usage Advice

The unit has been designed to give the user as little down time as possible. If an S2‑PSU

rail reaches an unrecoverable state, please remove and service it. If an extreme fault occurs

(total loss of power) on the +VD rail, the switch over can cause a reset of digital modules

which will result in a small audio glitch.

Rear Panel

Fig 3‑6: S2‑PSUS Rear Panel.

There are alarm outputs on the rear of the unit, created using opto‑isolator switches.

These alarm outputs mimic those on the front panel and there is also an alarm relay which

operates as a warning for total unit failure. This will come on if the both power supplies

have failed.

Power Input Connectors

Two trailing leads 0.5m in length are used to connect 2 x S2‑PSU units to the power switcher.

Power Output Connector

This 9 pin D type connector (see Fig 2‑9) is used to route power to the Mixer from either the

master or slave power supply. It has the same connections as the output from the PSU (see

above).

Alarm & Status Connector

This 25 pin D type socket provides alarm and status output for the power switcher and has

the following connections;

Pin 1: 0V.

Pin 2: Opto isolated +VE master alarm NPN collector.

Pin 3: Opto isolated +VE master alarm NPN emitter.

Pin 4: Opto isolated +VE slave alarm NPN collector.

P O W E R S U P P LY

POWER SUPPLY

S2 User Handbook 23

Pin 5: Opto isolated +VE slave alarm NPN emitter.

Pin 6: Opto isolated ‑VE master alarm NPN collector.

Pin 7: Opto isolated ‑VE master alarm NPN emitter.

Pin 8: Opto isolated ‑VE slave alarm NPN collector.

Pin 9: Opto isolated ‑VE slave alarm NPN emitter.

Pin 10: Opto isolated +VD master alarm NPN collector.

Pin 11: Opto isolated +VD master alarm NPN emitter.

Pin 12: Opto isolated +VD slave alarm NPN collector.

Pin 13: Opto isolated +VD slave alarm NPN emitter.

Pin 14: Opto isolated +48 master alarm NPN collector.

Pin 15: Opto isolated +48 master alarm NPN emitter.

Pin 16: Opto isolated +48 slave alarm NPN collector.

Pin 17: Opto isolated +48 slave alarm NPN emitter.

Pin 18: Opto isolated master active NPN collector.

Pin 19: Opto isolated master active NPN emitter.

Pin 20: Opto isolated slave active NPN collector.

Pin 21: Opto isolated slave active NPN emitter.

Pin 22: Master alarm relay contact 1 (makes to pin 23).

Pin 23: Master alarm relay contact 2 (makes to pin 22).

Pin 24: 0V.

Pin 25: 0V.

Dimensions (S2-PSUS)

(Raw): 48cm (W) x 23cm (D) x 4.4cm (H)

19” (W) x 9” (D) x 1.7” (H)

(Boxed): 55cm (W) x 39.3cm (D) x 8.5cm (H)

21.6” (W) x 15.5” (D) x 3.4” (H)

Weight (S2-PSUS)

Nett: 1.58kg (3.5lbs) Gross: 2kg (4.4lbs)

Important Notes:

Note 1: S2‑PSU units manufactured before June 2006 will need to be modied for use with

the S2‑PSUS. Contact Sonifex with the serial number of your unit if you wish to add‑on the

S2‑PSUS power supply switcher.

Note 2: The S2‑PSUS has been redesigned (from April 2011) to work with both the new 1U

S2‑PSU and older 2U S2‑PSU power supplies. S2‑PSUS units with a serial number greater

than 16948 are able to work with either S2 power supply, but serial numbers lower than this,

only operate with the 2U S2‑PSU.

Please Note:

There are two jumpers inside the unit to congure it to work with the two types of S2 Power

Supply that have been manufactured: the original 2U 19” rack power supply and the new

universal input voltage 1U 19” rack style power supply.

P O W E R S U P P LY

POWER SUPPLY

24 S2 User Handbook

POWER SUPPLY

P O W E R S U P P LY

The factory default is set to the new 1U S2‑PSU. Should you be conguring the S2‑PSUS

to work with a 2U S2‑PSU, you have to modify the appropriate jumper/jumpers as shown

overleaf.

Fig 3‑7: New S2‑PSU Diagram.

S2 User Handbook 25

INPUT CHANNELS

I N P U T C H A N NE L S

4 Input Channels

There are eleven dierent input channels available for installation in the mixer as well as a

blank channel and script space.

The modules carry some common features, such as the ability to select the output as

PRG and/or AUD and each button on a module can be programmed in dierent modes,

depending on your requirements. The channels are each covered in the following chapters,

but a summary follows:

S2-CML Mic/Line Input Channel

The Mic/Line Input channel is a mono input with a button switch to select either Mic or

Mono Line. If the Mic input is used for the presenter’s mic it can also become the talkback

mic. The talkback function will be retained when the channel input is switched to Line.

Equalisation is tted as standard on this channel and is enabled by the EQ button, providing

7dB cut and boost at HF (6.5kHz) and LF (100Hz). The Mic input has a jumper selectable high

pass lter to remove low frequency intrusions. A Pan control is available to facilitate stereo

imaging. A balanced line level insert send and return is available for the Mic input but is

disabled in Line mode.

Channel coarse gain is set by internal presets for mic and line – ne gain is trimmed by the

front panel Trim control providing ± 12dB of gain. The channel has a Pre Fade Listen (CUE/

PFL) facility that can be automatically disabled when the fader is opened. There are logic

remote input controls for Mic Cough muting and Reverse Talkback, and output controls for

Mic cue lights and Line remote start/stop by fader or ON button. The remote outputs on

the 9 way D type plug are fed from NPN opto‑isolators. The Mic input provides a jumper

selectable output to facilitate either Control Room or Studio Muting and Timer functions. In

addition the Line input can be congured with all the features of the Mic input when used

as a Mic input with an external mic amp.

S2-CMM Mic/Mic Input Channel

The Mic/Mic Input channel has all the features of the Mic/Line Input channel except that the

Line input is replaced by a second Mic input.

S2-CS Dual Stereo Line Input Channel

The Dual Stereo Input channel has two balanced stereo inputs with a button switch to select

between them. Each input is on XLR connectors with internal coarse gain adjustment. Fine

gain is trimmed by the front panel Trim control providing ± 12dB of gain. A Balance control

is available for small adjustments of the stereo image. The channel has a Pre Fade Listen

(CUE/PFL) facility that can be automatically disabled when the fader is opened.

There are logic remote output controls for each of the two inputs providing start/

stop functions by fader or ON button. The start function can be congured to be either

momentary (500mS) or latched for each input. The remote outputs on the 9 way D type plug

are fed from NPN opto‑isolators.

26 S2 User Handbook

S2-CSE Dual Stereo Line Input with EQ Channel

This channel is the Dual Stereo Input channel as above but tted with equalisation,

providing 7dB cut and boost at HF (6.5kHz) and LF (100Hz).

S2-CSG Stereo Line with Gram Input Channel

This channel is the Dual Stereo Input channel tted with a RIAA input amplier on the

second input. Input connections for this are unbalanced on phono sockets. This channel is

also available with equalisation, type number S2‑CSGE.

S2-CDS Digital Dual Stereo Input Channel

The Digital Dual Stereo Input channel has two 24‑bit 96kHz digital inputs with a button

switch to select between them. Either input can be congured to be balanced AES/EBU on

standard XLR, or S/PDIF on phono sockets, selected by internal jumpers. The digital signals

are converted to analogue and from this point the channel functions are the same as the

Dual Stereo Line Input channel.

S2-CDSE Digital Dual Stereo Input with EQ Channel

This channel is the Digital Dual Stereo Input channel as above but tted with equalisation,

providing 7dB cut and boost at HF (6.5kHz) and LF (100Hz).

S2-C6SS 6 Way Stereo Line Source Select Channel

The 6 Way Stereo Line Source Select channel has 6 balanced stereo inputs on a 25 way

D type connector selectable by a 6 way mechanical interlocking switch bank. The switch

bank also controls 6 sets of remote outputs allowing each source to have a set of start/stop

remotes. The channel is tted with EQ as standard and other functions similar to the dual

stereo input channel.

S2-CT Telco Input Channel

The Telco Input channel controls the connection to the telephone balance unit (hybrid).

It has only one mono input with EQ tted as standard. Equalisation is enabled by the EQ

button, providing 7dB cut and boost at HF (6.5kHz) and LF (100Hz). A Pan control is available

to facilitate stereo imaging. A balanced line level output is provided for the cleanfeed back

to the hybrid.

Channel coarse gain is set by an internal preset and ne gain is trimmed by the front panel

Trim control providing ± 12dB of gain. The channel has a Pre Fade Listen (CUE/PFL) facility

that automatically routes talkback to the caller when selected. PFL can be automatically

disabled when the fader is opened. There is a logic remote output to place the hybrid “on

hold” by using the LINE HOLD button. The remote output on the 9 way D type plug is fed

from an NPN opto‑isolator.

The bus system allows for two true cleanfeed systems when routed to the PGM outputs. O

line phone conversations can be recorded via the AUD bus where a cleanfeed is generated

by the mix‑minus method.

I N P U T C H A N NE L S

INPUT CHANNELS

S2 User Handbook 27

S2-CSMM Stereo Mix-Minus Channel

The Stereo Mix‑Minus channel has one balanced stereo input and a balanced stereo mix‑

minus output, 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 the mix‑minus method from either the PGM or AUD outputs,

depending on the routing selection.

The outputs on this channel can also be congured by jumpers as a mono sum of mix‑minus

on the left channel and continuous talkback on the right channel (for use with some ISDN

codec applications and telephone balance units).

Equalisation is tted as standard on this channel and is enabled by the EQ button, providing

7dB cut and boost at HF (6.5kHz) and LF (100Hz). Coarse input gain is adjusted internally.

Fine gain is trimmed by the front panel Trim control providing ± 12dB of gain. A Balance

control is available for small adjustments of the stereo image. The channel has a Pre Fade

Listen (CUE/PFL) facility that can be automatically disabled when the fader is opened.

There is a logic remote output function controlled by fader or ON button. The remote

function can be congured to be either momentary (500mS) or latched. The remote outputs

on the 9 way D type plug are fed from NPN opto‑isolators.

S2-PG S2 Penny & Giles Conductive

Plastic Fader

The input and output channels of an S2

mixer can optionally be tted with high

quality Penny & Giles faders.

I N P U T C H A N NE L S

INPUT CHANNELS

28 S2 User Handbook

5 S2-CML Mic/Line Channel With EQ

Panel Controls

PGM and AUD Selection

Selecting the PGM, AUD buttons routes the channel audio output to the PGM

and/or AUD mix buses. The buttons are illuminated in green to indicate the

routing status. Changing the status of the PGM button is inhibited when the

channel is “live”.

MIC/LINE Selection

Selecting the MIC/LINE button changes the channel input connection

between Mic and Line. The button is illuminated in red to indicate when Line

is selected. The operation of the button is inhibited when the channel is “live”.

Equalisation Controls

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 EQ button places the equalisation

in and out of the signal path. The button is illuminated in yellow when the EQ

is active.

TRIM Control

The Trim control provides an additional ±12dB of gain to ne tune the input

signal level.

BAL/PAN Control

The Bal control is used to pan the mono input signal in the stereo image.

Full 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).

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 BAL/PAN control. The button is illuminated in

green when CUE/PFL is active. There is a jumper option to cancel the CUE/PFL

selection when the fader is raised. This button works with both a momentary

and latched operation. If held down,

the selection is cancelled when released, otherwise the button is

alternate action.

Fader

The 100mm VCA fader provides unity gain when fully open. The channel input

signal is routed to the outputs whenever the fader is open, the ON button is

selected and either or both of the routing buttons are selected.

S 2  C M L M I C/ L IN E C H A N N E L W I T H E Q

S2 ‑CML

S2 User Handbook 29

ON Selection

The ON button works in conjunction with the fader and is used to control channel remotes,

routing, timers, etc. The button shows various states. When unlit the channel is o. Flashing

red indicates that the channel has been selected to ON but remains unrouted i.e. neither

PGM or AUD is selected. Steady red indicates that the channel is ON and “armed”, ready

for the fader to be raised. Raising the fader changes the illumination to green indicating

that the channel is live. Alternatively, 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, channel OFF and green, channel ON. Remotes, etc, are triggered when the

fader is up and the channel ON button shows green.

Scribble Pad

A scribble pad is provided at the bottom for user labelling of the channel function

e.g. “Pres. Mic”

Rear Panel

Mic Input Connector

This XLR 3 pin socket is used for the microphone input and has the

following connections;

Pin 1: Screen.

Pin 2: Phase.

Pin 3: Non‑phase.

Line Input Connector

This XLR 3 pin socket is used for the electronically balanced line input

and has the following connections;

Pin 1: Screen.

Pin 2: Phase.

Pin 3: Non‑phase.

Remotes Connector

This 9 pin D type plug provides inputs and outputs for the following

channel functions;

• Mic cue light

• Line remote start

• Line remote stop

• Cough/reverse talkback switch

• Talkback mic enable

S 2 - C M L M I C /L I N E C H A N N E L W IT H E Q

30 S2 User Handbook

The connector pin‑out is as follows;

Pin 1: Opto isolated mic cue light NPN collector.

Pin 2: Common NPN emitter for above.

Pin 3: No connection.

Pin 4: Opto isolated Line start NPN collector.

Pin 5: Common NPN emitter for Line start and stop.

Pin 6: Opto isolated Line stop NPN collector.

Pin 7: 0V logic.

Pin 8: Cough/reverse talkback switch (make to 0V to activate).

Pin 9: Talkback mic enable (make to 0V to enable the mic input as the T/B mic).

Insert Send Connector

This XLR 3 pin plug is a balanced line level pre‑EQ output intended to be fed to an eects

processor for the microphone input, and has the following connections;

Pin 1: Screen.

Pin 2: Phase.

Pin 3: Non‑phase.

Insert Return Connector

This XLR 3 pin socket is intended for the input signal from the equipment fed by the Insert

Send. The connections are the same as the Insert Send connector. The Insert function is

disabled in Line mode except when the “Mic on Input 2” jumper is set. See Channel Options.

Channel Options, Jumper Settings and Presets

The Mic/Line channel with EQ can be congured in a number of dierent ways depending

on the jumper options set on the board. The on‑board processor’s software is congured by

jumpers J1 to J5 and channel identifying links. The Mic/Line channel is identied by having

links LK14 and LK15 tted. Other, customer specic, options can be programmed into the

software by special order. Special logic options will be identied by having links LK23 and

LK24 tted.

The standard options available are;

• Using a phantom powered microphone.

• Enable full LF response on microphone input.

• Enable the Insert Point.

• Select momentary or latched start.

• Select monitor mute for studio or control room.

• Select timer option.

• Enable or disable Cue/PFL cancel from fader.

• Enable continuous momentary start from ON button.

• Enable mic on Input 2.

S 2 - C M L M I C /LI N E CH A N N E L W I T H E Q

S2 User Handbook 31

Summary of Jumper Settings for the Mic/Line Channel With EQ

Jumper Set over Pins Eect

J1 1 & 2

None

Latching contact for Mic cue light.

Momentary contact for Mic cue light.

J2 1 & 2

None

Latching contact for Line remote start.

Momentary contact for Line remote start.

1 & 2

None

Continuous momentary start from ON button,

see following description.

Normal start function.

J4 1 & 2

None

Fader up signal cancels previously selected Cue/PFL.

Normal Cue/PFL function.

J5 1 & 2

None

Microphone on Line input.

Normal Line input.

J6 1 & 2

2 & 3

Phantom power to Microphone.

Normal operation.

J7 1 & 2

None

Full LF response on Microphone input.

LF roll o.

J8 Not Fitted

J9 Not Fitted

J10 1 & 2

None

Insert point enabled (Insert in).

Insert out only.

J11 Not Fitted

J12 Not Fitted

J13

1 & 2

2 & 3

None

Control room monitor mute from Microphone input.

Studio monitor mute from Microphone input.

No mute function.

J14

1 & 2

2 & 3

None

Auto start Timer 1.

Auto start Timer 2.

No timer function.

J15

1 & 2

2 & 3

None

Control room monitor mute from Line input.

Studio monitor mute from Line input.

No mute function.

J16

1&2

2&3

None

MIC1 is selected as Talkback input

Reserved

No Talkback input

Note: Options in are set as default when shipped.bold

S 2 - C M L M I C /L I N E C H A N N E L W I TH E Q

32 S2 User Handbook

Fig 5‑1 : S2 Mic/Line Input Board Layout.

Remote for Mic Cue Light

The remote output for the Microphone input (Input 1) can be used to operate a Mic Cue

light when the channel is ON and the fader is up. This should not be confused with a Mic

Live light. The Mic Cue light is used for indicating to presenter or guest that they should

talk into the microphone. Jumper J1 is placed over pins 1 & 2. This is the default setting and

produces a latched remote output.

Remote for Line

The remote output for the Line input (Input 2) can be used for starting a machine such as

a CD or MD player. The default setting produces a momentary remote output. If a latched

output is required then a jumper should be placed over pins 1 & 2 of J2. The remote stop

output for the Line input is always momentary.

Continuous Momentary Start

The continuous momentary start function is rarely used on the Mic/Line channel and

therefore J3 should be left in the default setting.

CUE/PFL Cancel

The CUE/PFL function is normally an alternate action. Press the button to select and press

again to de‑select. However it may be desirable to have the fader up signal cancel a Cue/

PFL selection. Placing a jumper over J4 pins 1 & 2 will enable a previously selected Cue/PFL

function to be cancelled when the fader is up and the channel is ON. The default setting is

none (not tted).

Mic Signalling on Line Input

In certain circumstances it may be desirable that a line input is treated as mic input by the

mixers internal logic whilst still being a line level input. For instance, when a mic is used with

an external pre‑amp or eects unit. A mic pre‑amp can therefore be placed on the line input

and act in the same way as the standard mic input.

( Please note for external signalling or muting the control room or studio muting functions

must still be enabled.)

S 2 - C M L M I C / L I N E C H A N N E L W I T H E Q

Mic 1 im Tr Left Sym.

Right Sym.

LK24

LK23

LK15

LK14

Jumper Options

J1 = Latch Start I/P 1

J2 = Latch Start I/P 2

J3 = Cont. Mom. Start from On

J4 = Fader Cancel Cue/PFL

J5 = Mic Signalling on Line Input

J13 = Mic Input Speaker Muting

J15 = Line Input Speaker Muting

Line Input im Tr

Phantom

Power

Response

Jumper On

For Mic Insert

J16

J10

J14 J13 J15

JMute 1

Timer Mute 2

Special

Set VC 0dB A

Mic/Line

S2 User Handbook 33

Placing jumper J5 over pins 1 & 2 will enable the muting functions on the line input. The

default setting is none (not tted).

Phantom Power

If you will be using a phantom powered microphone, jumper J6 must be placed over pins 1

& 2. If a normal microphone is used the jumper should be left over pins 2 & 3. With phantom

power selected a voltage of +48V is applied to pins 2 & 3 of the XLR connector. The voltage

is applied through 6k8 resistors limiting the current to 14mA. The default setting is with the

jumper over pins 2 & 3.

Microphone LF Response

The default setting of J7 is with the jumper over pins 1 & 2 which gives a full LF response to

the microphone. However, if your studio is acoustically poor and suers from a lot of low

frequency rumbles the LF response of the microphone can be rolled o at 125Hz, 6dB per

octave, to reduce these acoustic problems. This is achieved by removing jumper J7. Jumpers

J8 and J9 are not tted to the Mic/Line channel.

Enabling the Insert Point

The Insert point is useful for hooking up an outboard eects unit to be used with the

microphone, for example, a voice processor. The insert send signal is always available as a

line level balanced output. The insert return signal is enabled by placing jumper J10 over

pins 1 & 2. The insert return function is disabled in Line mode except when jumper J5, Mic

on Line Input, is set. The default setting of J10 is none (not tted).

Jumpers J11 and J12 are not tted to the Mic/line channel.

Mic Live Muting

The microphone input can be set to mute the control room or studio monitors. The default

setting of J13 over pins 1 & 2 will enable a live microphone to mute the control room

monitors. If it is required to mute the studio monitors the jumper should be shifted to pins

2 & 3. If no muting is required, the jumper should be removed. When a line level mic is used

on input 2, J15 sets the muting function. A jumper over pins 1 & 2 will mute the control

room monitors and over pins 2 & 3 will mute the studio monitors. Line input (input 2)

muting is only enabled when jumper J5, Mic on Line Input, is set. The default setting of J15

is none (not tted).

Timer Auto Start

The dual timer in the meterbridge can be set to start automatically from a fader open/

channel On signal. Jumper J14 determines which timer is set to auto‑start. A jumper over

pins 1 & 2 will start Timer 1, shifting the jumper to pins 2 & 3 will start Timer 2. The default

setting of J14 is none (not tted). Please note that the Timer Auto Start is only available on

the Line Input.

Mic On Talkback Bus

To enable the microphone input to be added to the talkback bus, connect pins 7 (0V logic)

and 9 (Talkback mic enable) on the remote connector. This is useful if, for example, you

want to use the mic channel to talk to a caller connected to the cleanfeed output of the

telco channel.

S 2 - C M L MIC / L I N E C HA N NE L W I T H E Q

34 S2 User Handbook

Presets

Two presets are available for adjustment of the input gain for the mic and line levels.

The mic preset, P1, provides 59dB of gain adjustment, allowing an input range of –7dB to

–66dB. The preset should be adjusted to give 0dB output for the chosen microphone in use.

The level is preset for –50dB input when shipped.

The line preset, P3, provides 16dB of gain adjustment, allowing an input range of +6dB to

–10dB referenced to 0dB output. The preset should be adjusted to give 0dB output for the

chosen source, and will cater for professional equipment with nominal output levels up to

+4dB and non‑professional equipment with nominal output levels down to –10dBV. The

level is preset for 0dB input when shipped.

Presets P5 & P6 are for altering the audio waveform symmetry (i.e. distortion). They are

factory set on nal test and should not be adjusted further.

A third preset, P9, sets the VCA fader gain to 0dB when the fader is fully open. This is preset

on nal test and should not require further adjustment, unless it has been found necessary

to replace the fader or other VCA components.

Button Mode Settings

To make the S2 modules as exible as possible, every button on each channel can be set

to a number of dierent modes. These will aid in the use of the mixer and allow for extra

functionality. To make use of these modes, you must enter a setup mode which is exactly

the same for every module. It is only necessary to perform this procedure once.

To enter the setup mode, hold down the PGM and AUD buttons together for 5 seconds.

After which all the buttons will start a recurring ashing sequence, at this point it is ok to

release the PGM and AUD buttons. This sequence indicates the mode which each button is

currently set to. One ash equals mode one, two ashes equals mode two etc. To change the

mode for a particular button simply press it once and watch the number of ashes increase.

Once the maximum mode number has been reached it will simply wrap around to mode

one and continue as before. To exit this setup procedure press and hold both the PGM and

AUD buttons as before for 2 seconds and the module will start operating as normal.

Each button and their corresponding modes are listed below.

PGM

Mode 1 : Normal. The program bus can be selected as normal.

Mode 2 : Always on. The program bus is permanently selected.

Mode 3 : Always o. The program bus is permanently deselected.

AUD

Mode 1 : Normal. The audition bus can be selected as normal.

Mode 2 : Always on. The audition bus is permanently selected.

Mode 3 : Always o. The audition bus is permanently deselected.

S 2 - C M L M I C /L I N E C H A N N E L W I T H E Q

S2 User Handbook 35

MIC/LINE

Mode 1 : Normal. Can be selected as normal.

Mode 2 : Always Line. Line is permanently selected.

Mode 3 : Always MIC. MIC is permanently selected.

Mode 1 : Normal. Equalization can be enabled or disabled as normal.

Mode 2 : Always enabled. Equalization controls are permanently enabled.

Mode 3 : Always disabled. Equalization controls are permanently disabled.

Cue/PFL

Mode 1 : Normal. Cue/PFL is selected as normal, with both a momentary or

latched operation.

Mode 2 : Latched. Cue/PFL is selected as normal, but will only work with a

latched operation.

Mode 3 : Momentary. Cue/PFL is selected as normal, but will only work with a

momentary operation.

Mode 1 : Normal.

Mode 2 : Always on. The channel cannot be turned o.

Mode 3 : Always on and no LED indication. The channel cannot be turned o and the

On button LEDs are never active.

S 2 - C M L M I C /LIN E CHA N N E L W I T H E Q

36 S2 User Handbook

S 2  C M M M I C / M I C C H A N N E L W I T H E Q

6 S2-CMM Mic/Mic Channel With EQ

Panel Controls

PGM and AUD Selection

Selecting the PGM, AUD buttons routes the channel audio output to the

PGM and/or AUD mix buses. The buttons are illuminated in green to indicate

the routing status. Changing the status of the PGM button is inhibited when

the channel is “live”.

MIC 1/MIC 2 Selection

Selecting the MIC 1/MIC 2 button changes the channel input connection

between MIC 1 and MIC 2. The button is illuminated in red to indicate when

MIC 2 is selected. The operation of the button is inhibited when the channel

is “live”.

Equalisation Controls

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 EQ button places the

equalisation in and out of the signal path. The button is illuminated in yellow

when the EQ is active.

TRIM Control

The TRIM control provides an additional ±12dB of gain to ne tune the input

signal level.

BAL/PAN Control

The BAL/PAN control is used to pan the mono input signal in the stereo

image. Full 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).

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 Bal control. The button is illuminated in green

when CUE/PFL is active. There is a jumper option to cancel the CUE/PFL

selection when the fader is raised. This button works with both a momentary

and latched operation. If held down, the selection is cancelled when

released, otherwise the button is alternate action.

Fader

The 100mm VCA fader provides unity gain when fully open. The channel

input signal is routed to the outputs whenever the fader is open, the ON

button is selected and either or both of the routing buttons are selected.

S2 ‑CMM

S2 User Handbook 37

S 2 - C M M M I C / M I C C H A N N E L W I T H E Q