Sonifex RM-CA2 Instruction Manual

Confidence Monitors
User Handbook
RM-CA2 Confidence Monitor, 2 LED Meters & 2
Analogue Stereo Inputs
RM-CAD8 Confidence Monitor, 2 LED Meters, 2
Analogue & 6 Digital Stereo Inputs

bCondence Monitors User Handbook
This handbook is for use with the following product:
RM-CA2 Confidence Monitor, 2 LED Meters & 2 Analogue Stereo Inputs
RM-CAD8 Confidence Monitor, 2 LED Meters, 2 Analogue & 6 Digital Stereo Inputs
©Sonifex Ltd, 2009-2010
All Rights Reserved
Revision 1.02, June 2013
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel: [phone]
Fax: [phone]
Email: [email protected].uk
Website: http://www.sonifex.co.uk
Information in this document is subject to change without notice and does not represent a commitment on the part of
the vendor. Sonifex Ltd shall not be liable for any loss or damage whatsoever arising from the use of information or any
error contained in this manual.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical,
including photocopying, recording, information storage and retrieval systems, for any purpose other than the purchaser’s
personal use, without the express written permission of Sonifex Ltd. Unless otherwise noted, all names of companies,
products and persons contained herein are part of a completely fictitious adaptation and are designed solely to
document the use of Sonifex product.
CONFIDENCE MONITORS
USER HANDBOOK
CONFIDENCE MONITORS USER HANDBOOK

Condence Monitors User Handbook c
CONTENTS
CONTENTS
Warranty i
Warranty and Liability i
Unpacking the Condence Monitor iii
Returning the Warranty Card iii
Safety Information iv
Safety of Mains Operated Equipment iv
Voltage Setting Checks iv
Fuse Rating iv
Power Cable and Connection iv
Ordering the Correct Mains Lead v
Installation Information v
Atmosphere v
Electromagnetic Radiation v
WEEE & RoHS Directives - Sonifex Statement vi
Condence Monitors Introduction 1
Detail In The Design 1
Anti-Vibration 1
Accurate Sound System 1
Features Summary 2
DSP Based Design 2
RM-CA2 Condence Monitor, 2 LED Meters & 2 Analogue Stereo Inputs 3
RM-CAD8 Condence Monitor, 2 LED Meters, 2 Analogue & 6 Digital Stereo Inputs 4
System Block Diagram 4
Front Panel Indicators & Controls 5
Power LED 5
Source Selector 5
Sync Lost indicator 6
Main Meters 6
PHASE Error LED 6
Level and Balance Controls 7
Headphone Output 7
Rear Panel Connections & Operation 8
Line Level Audio Outputs 9
Mains Power 9
DIPSwitch Settings 10
Reduce Meter Levels by 10dB - DIPSwitch 1 10
Reduce Output Levels by 10dB - DIPSwitch 5 10
Meter Characteristics Selection - DIPSwitch 7 10
Mute Speaker Output - DIPSwitch 8 10
Technical Specication RM-CA2 & RM-CAD8 11

dCondence Monitors User Handbook
FIGURES
FIGURES
Figures
Fig A: Packing List iii
Fig B: Power Connections iv
Fig C: Mains Lead Table v
Fig 1-1: RM-CA2 Condence Monitor Front Panel 3
Fig 1-2: RM-CAD8 Condence Monitor Front Panel 4
Fig 1-3: Condence Monitor Block Diagram 4
Fig 1-4: RM-CA2 Front Panel Controls 5
Fig 1-5: RM-CAD8 Front Panel Controls 5
Fig 1-6: RM-CA2 Source Selector Button 5
Fig 1-7: RM-CAD8 Source Selector Button 5
Fig 1-8: RM-CA2 & RM-CAD8 Meters & Phase Error LED 6
Fig 1-9: RM-CA2 Left Level or Balance Control and Power On Indicator 7
Fig 1-10: RM-CAD8 Right Level or Stereo Level Control 7
Fig 1-11: RM-CA2 & RM-CAD8 Meters & Phase Error LED 8
Fig 1-12: Condence Monitor RM-CA2 Rear 8
Fig 1-13: Condence Monitor RM-CAD8 Rear 8
Fig 1-14: DIPSwitch Settings 10

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

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

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

iv Condence Monitors User Handbook
Safety Information
Safety of Mains Operated Equipment
This equipment has been designed to meet the safety regulations currently
advised in the country of purchase and it conforms to the safety regulations
specied by use of the CE Mark.
Warning : There are no user serviceable parts inside the equipment. If you should ever
need to look inside the unit, always disconnect the mains supply before removing the
equipment covers.
Voltage Setting Checks
Condence Monitors have a universal power supply.
Fuse Rating
The Condence Monitor is supplied with a single fuse in the live conducting path of the
mains power input. For reasons of safety it is important that the correct rating and type of
fuse is used. Incorrectly rated fuses could present a possible re hazard, under equipment
fault conditions. The fuse rating for the Condence Monitor is:
230 or 115 V operation - 2A 5 x 20mm SB
The active fuse is tted on the outside rear panel of the unit.
Power Cable and Connection
An IEC power connector is supplied with the Condence Monitor which has a moulded
plug attached – this is a legal requirement. If no moulded plug has been supplied with
your Condence Monitor, please contact your supplier, because an IEC connector is always
supplied from the Sonifex factory.
If for any reason, you need to use the Condence Monitor with a dierent power cable, you
should use the following wiring guidelines.
Wire Colour Connection
Green, or green and yellow Earth (E)
Blue, or black Neutral (N)
Brown, or red Live (L)
Fig B: Power Connections
Connect the equipment in accordance with the connection details and before applying
power to the unit, check that the machine has the correct operating voltage for your mains
power supply.
Important Note : The terminal marked on the rear panel must be earthed.
SAFETY INFORMATION
SAFETY INFORMATION

Condence Monitors User Handbook v
Ordering the Correct Mains Lead
When ordering a Condence Monitor from Sonifex, it is helpful if you can specify your
required operating voltage and mains lead. After the product code add:
UK, for 230V, UK 3 pin to IEC lead
EC, for 230V, European Schuko 2 pin to IEC lead
US, for 115V, 3 pin to IEC lead
AU for 230V, Australasian 3 pin to IEC lead
Fig C: Mains Lead Table
E.g. order RM-2CA2 UK for a UK IEC lead to be supplied.
Installation Information
Atmosphere
The units should be installed in an area that is not subject to excessive temperature
variation (<0°C, >50°C), moisture, dust or vibration.
Electromagnetic Radiation
The cover is connected to earth by means of the xing screws. It is essential to maintain
this earth ground connection to ensure a safe operating environment and provide
electromagnetic shielding.
SAFETY INFORMATION
SAFETY INFORMATION

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

Condence Monitors User Handbook
CONFIDENCE MONITORS
INTRODUCTION
1
CONFIDENCE MONITORS INTRODUCTION
Condence Monitors Introduction
The Confidence Monitor Range is a series of rack-mount audio monitors,
combining the latest DSP technology with outstanding audio enclosure design
to produce monitors of the highest standards with exceptional sound quality,
a comprehensive feature set and good looks in the rack.
Detail In The Design
In the design of the product, every care has been taken to ensure the best and most
accurate reproduction of the audio sources.
In a 1U rack, the propogation of high power sound waves in such a small enclosure could
have a tendency to produce rattles or move components, but the Condence Monitors
have been designed to ensure that their audio performance is not compromised.
Anti-Vibration
A welded, sealed and painted steel case with milled aluminium fascia provides exceptional
rigidity and has been used to ensure that there are no extraneous metallic rattles. The lid
is sealed with extensive thin foam cut-outs to provide damping to the lid and multi-point
screw xings are used to ensure lid rigidity.
Accurate Sound System
The speaker system comprises a three-way arrangement with two mid/high frequency
speakers providing excellent stereo imaging and a separately driven, forward facing, dual
magnet, mono bass driver.
Custom-moulded, proled, HF enclosures are used to minimise standing waves and
eliminate response peaks, and acoustic damping in the HF enclosures is used to reduce
colouration, eectively creating a separate, sealed, innite-bae enclosure for each driver.
Each of the drivers is magnetically shielded so that the monitors are perfectly safe to
use near CRTs and TFT displays and each speaker uses a separate, highly ecient class-D
switching amplier.
Even cable lengths to and from the speaker enclosures have been kept short to reduce any
potential microphonic induction.
1

Condence Monitors User Handbook
2
Features Summary
DSP Based Design
The use of a modern electronic architecture allows a much better audio performance to be
realised. The DSP-based, 3rd-order active crossover provides perfect separation between
mid-range and bass sounds.
A DSP-based electronic equalisation is used to atten the frequency response and the fast-
attack DSP loudspeaker limiter protects the drivers from overload damage.
CONFIDENCE MONITORS
INTRODUCTION
CONFIDENCE MONITORS INTRODUCTION
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rigidity.
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provide excellent stereo imaging.
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dual magnet, mono bass driver.
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enclosures minimise standing waves.
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enclosures reduces colouration.
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enclosure for each driver.
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the monitors are perfectly safe to use
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switching amplier for each speaker.
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the speaker enclosures to reduce any
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performance to be realised.
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separation between mid-range and
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global voltage operation without
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1

Condence Monitors User Handbook
CONFIDENCE MONITORS
INTRODUCTION
3
CONFIDENCE MONITORS INTRODUCTION
1
RM-CA2 Confidence Monitor, 2 LED Meters &
2 Analogue Stereo Inputs
Fig 1-1: RM-CA2 Condence Monitor Front Panel
The RM-CA2 is a 1U rack-mount unit oering quality loudspeaker monitoring and 2 channel
metering of two stereo analogue audio sources. Input 1 has stereo balanced Neutrik™
XLRs and Input 2 has both stereo balanced Neutrik™ XLRs and stereo unbalanced RCA
phono connectors, these inputs are mixed together in the analogue domain. The balanced
analogue inputs can be wired unbalanced if required.
Sources are selected via a front panel push-button button, with clear LED indication of the
current source.
A rear panel DIP switch setting allows the unit to monitor either:
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balance control, to alter the stereo imaging of the left and right channels, or
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volume controls.
There is a front panel headphone socket which responds to the volume controls and the
headphone socket automatically mutes the internal loudspeakers when a plug is inserted.
A pair of line-level analogue audio outputs follow the selected source at the selected level,
or optionally at 10dB lower (if using the unbalanced input), set via rear-panel DIP switch 5.
The level of the chosen source is shown on an 8 segment LED bar-graph display with PPM
and VU scales indicated. The bar-graph can optionally be lowered by 10dB (if using input 2),
set via rear-panel DIP switch 1.
A single phase error LED indicates phase error conditions.
The three-way loudspeaker system is fed via a DSP-based active crossover and a trio of
highly ecient Class-D ampliers. Careful attention to driver selection, materials and
case design, plus active DSP equalisation, has ensured a at response and outstanding
reproduction from such a shallow unit. A protective limiter prevents damage to the
loudspeakers under overload conditions
The RM-CA2 operates from global mains voltages (85-264V AC, 47-63Hz) without
adjustment.

4Condence Monitors User Handbook
1CONFIDENCE MONITORS
INTRODUCTION
CONFIDENCE MONITORS INTRODUCTION
RM-CAD8 Confidence Monitor, 2 LED Meters, 2 Analogue &
6 Digital Stereo Inputs
Fig 1-2: RM-CAD8 Condence Monitor Front Panel
The RM-CAD8 has all the features of the RM-CA2 together with the ability to select from an
additional 6 stereo digital inputs. As well as the 2 stereo analogue inputs there are also:
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The source select button illuminates to indicate loss of synchronisation lock to the incoming
digital source.
A sample rate converter on the digital input allow sources of dierent sample rates to be
connected and monitored, between 32kHz and 96kHz. All other features of the unit are
identical to the RM-CA2.
System Block Diagram
Fig 1-3: Confidence Monitor Block Diagram
= Input Selector
A
= Metering
B
= Volume/Balance Control
C
= Overow Limiter
D
= Crossover & EQ
E
= Speaker Protection Limiter
F
Left
Speaker
Right
Speaker
Sub
Speaker
Inputs - RM-CA2 & RM-CAD8
Front Panel
Analogue
Inputs A/D
Converters
D Class Amp
DSP
Digital
Audio
Receiver
Condence Monitors Block Diagram
2
3
4
5
6
7
8
2
1
Balanced
Optical
Unbalanced
E F
CB D
I/O Driver
Level
Controls
Headphone
Socket
Push
Button
Select
Indicator
Bargraphs Error
Indicator
Sync Lost
Indicator
RM-CAD8 only
Line Level
Outputs
D/A
Converters

Condence Monitors User Handbook 5
2
FRONT PANEL INDICATORS
& CONTROLS
FRONT PANEL INDICATORS & CONTROLS
Front Panel Indicators & Controls
Fig 1-4: RM-CA2 Front Panel Controls
Fig 1-5: RM-CAD8 Front Panel Controls
Power LED
The POWER LED illuminates whilst internal power is present within the unit. If this indicator
is not on, the most likely reason is simply the absence of mains power, but under fault
conditions it may also indicate a ruptured mains fuse or a problem with the internal power
supply module.
Source Selector
Fig 1-6: RM-CA2 Source Selector Button Fig 1-7: RM-CAD8 Source Selector Button
The Source Selector determines which of the two (RM-CA2) or eight (RM-CAD8) stereo
audio inputs is routed to the loudspeakers and metering.
Pressing the Source selector button steps sequentially through all input sources. Once the
last available source is selected, a further press returns the selection to the first source.
When mains power is removed, the currently selected Source is stored in non-volatile
memory and recalled instantly once power is restored.

6Condence Monitors User Handbook
2FRONT PANEL INDICATORS
& CONTROLS
FRONT PANEL INDICATORS & CONTROLS
Sync Lost indicator
On the RM-CAD8 the Sync Lost indicator flashes when one of the following conditions is
met. A digital audio input is selected and the digital audio signal is:
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Main Meters
Fig 1-8: RM-CA2 & RM-CAD8 Meters & Phase Error LED
The main meters are twin 8-LED cluster, multicoloured bargraphs, displaying the currently
selected stereo audio source. The upper meter displays the left channel and the lower
meter the right channel.
Two different characteristics are available for the meters to suit different applications and
regional preferences. The active meter characteristic is selected by the setting of DIPSwitch
7 on the rear of the unit.
PHASE Error LED
The Phase Error LED is triggered if the phase difference between the two channels of the
currently selected input source remains consistently above 135 degrees.

Condence Monitors User Handbook 7
2
FRONT PANEL INDICATORS
& CONTROLS
FRONT PANEL INDICATORS & CONTROLS
Level and Balance Controls
Fig 1-9: RM-CA2 Left Level or Fig 1-10: RM-CAD8 Right Level
Balance Control and Power On Indicator or Stereo Level Control
There are two modes of operation for the level and balance controls determined by
DIPSwitch 3. When the DIPSwitch is o, the level for each channel is independently
controlled.
When the DIPSwitch is on, the level for both channels is set by the right hand
potentiometer and the left hand potentiometer acts as a balance control to alter the stereo
imaging by ±6dB.
The level potentiometers have a range of -52dB to +18dB gain. Also, moving the
potentiometer fully anti-clockwise will mute the output. Position 6 on the level scale
(1 o’clock) is a nominal unity gain position.
Headphone Output
The front panel headphone output is a ¼”(6.35mm) stereo jack socket capable of
delivering over 80mW into 32Ω - 600Ω professional headphones at full volume. Higher
impedance headphones may be used at reduced levels. Lower impedance headphones
should not be used.
Inserting a plug into the headphone socket and/or setting DIPSwitch 8 to‘on’ automatically
mutes the internal loudspeakers.

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LIMIT indicators
Limit active LED’s
Fig 1-11: RM-CA2 & RM-CAD8 Meters & Phase Error LED
The LIMIT indicators are an additional function of the left hand LED (-34 VU) of the meter
scales. When the level potentiometer gain is applied to the incoming signals the resulting
signal can exceed the maximum input levels into the D-class amplier. To avoid clipping
or overow conditions a limiter function is applied. The limiter is applied independently to
each channel and has an instantaneous attack with a slow release.
While the limiter is active the left hand LED will ash. If the LED is continually ashing then
the level potentiometer setting should be reduced so that the LED is always on or only
ashes infrequently.
Note that for the limiter to be required the incoming signal level will need to exceed 0dB
(VU -4). If the left hand LED is ashing but the meter levels are low then the incoming
signal is lower than VU 34 and this does not indicate a limiter function.
Rear Panel Connections & Operation
Fig 1-12: Confidence Monitor RM-CA2 Rear
Fig 1-13: Confidence Monitor RM-CAD8 Rear
Audio Inputs
Three-pin female XLR connectors are provided for the connection of two analogue stereo
audio sources and for the RM-CAD8 four digital stereo audio sources. The pin assignations

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REAR PANEL CONNECTIONS & OPERATIONS
are as follows:
Pin 1: Ground
Pin 2: In-phase signal (“hot”)
Pin 3: Out-of-phase signal (“cold”)
Unbalanced signals may also be used by linking pins 1 and 3 and applying the unbalanced
signal to pin 2.
Source two has a pair of RCA Phono connectors that are used to input an unbalanced
analogue stereo signal input 2 sources are both connected to the input selector as a
hard-wired mix. If you connect sources to the balanced and unbalanced inputs then both
sources mixed together will be sent to the speakers, headphone and output when input 2
is selected.
For the RM-CAD8 there is also an S/PDIF unbalanced digital stereo audio input on a RCA
phono connector and a TOSLink optical digital stereo audio input.
A full-scale digital input signal (0dBFS) corresponds to the maximum analogue input signal
level of +18dBu (with no extra input gain applied).
All digital inputs are terminated 110Ω for XLR and 75Ω for phono.
Line Level Audio Outputs
A pair of three-pin male XLR connectors provides a stereo line-level analogue audio output
carrying the selected audio Source signal. The XLR pin assignations are as follows:
Pin 1: Ground
Pin 2: In-phase signal (“hot”)
Pin 3: Out-of-phase signal (“cold”)
The signals may be unbalanced without loss of level by linking pins 1 and 3 and taking the
unbalanced signal from pin 2.
Mains Power
Power is applied via a standard three-pin IEC male socket. Mains voltages between 85V
and 264V AC and frequencies between 47 and 63Hz are accepted without adjustment.
A 2A, 5 x 20mm SB fuse is used. The Earth pin MUST be connected to ensure safety.
Digital Input Termination
All electrical digital audio inputs are terminated. 110Ω for the balanced XLR inputs and 75Ω
for the unbalanced S/PDIF inputs.

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DIPSwitch Settings
Fig 1-14: DIPSwitch Settings
Reduce Meter Levels by 10dB - DIPSwitch 1
This DIPSwitch is only valid when analogue input 2 is selected and when the switch is on it
will reduce the meter levels by 10dB. This switch will mainly be used when the unbalanced
inputs are used. In this case a 10dB gain is applied to the signal levels P650 that the
inputs from domestic equipment will be increased to levels typically used for professional
(unbalanced) equipment. If you wish to monitor the actual level of the unbalanced
incoming signals then this switch needs to be on. On the other hand if the balanced
input 2 is being used then the switch should be o.
Level/Balance Control Selection - DIPSwitch 3
This DIPSwitch switches the level and balance controls between independent left and right
level (switch o) and stereo level and balance control (switch on).
Reduce Output Levels by 10dB - DIPSwitch 5
If the audio output is connected to unbalanced consumer equipment then this switch
should be used to reduce the output levels by 10dB.
Meter Characteristic Selection - DIPSwitch 7
This DIPSwitch changes the metering characteristics between VU (o) and PPM (on).
Mute Speaker Output - DIPSwitch 8
This DIPSwitch will mute the speaker output when switched on. This will allow the unit to
use the audio output to drive external speakers only.
DIPSwitches 2,4,6 are reserved for future use and should be left in the o position.