Sonifex RM-CA2 User manual

Manufacturers of audio & video
products for radio & TV broadcasters
HANDBOOK
Confidence Monitors
RM-CA2 Confidence Monitor, 2 LED Meters & 2 Analogue Stereo Inputs
RM-CAD8 Confidence Monitor, 2 LED Meters, 2 Analogue & 6 Digital Stereo Inputs

Confidence Monitor 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
Stock Code: 30-229
Revision 2.01, February 2020
©Sonifex Ltd, 2020
All Rights Reserved
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel: [phone]
Fax: [phone]
Email: [email protected]o.uk
Website: https://www.sonifex.co.uk
Information in this document is subject to change without notice and does not represent a
commitment on the part of the vendor. Sonifex Ltd shall not be liable for any loss or damage
whatsoever arising from the use of information or any error contained in this manual.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying, recording, information storage and retrieval systems, for any
purpose other than the purchaser’s personal use, without the express written permission of Sonifex
Ltd. Unless otherwise noted, all names of companies, products and persons contained herein are
part of a completely fictitious adaptation and are designed solely to document the use of Sonifex
product.
Made in the UK by
For the latest Sonifex handbook information please visit the
Sonifex website at www.sonifex.co.uk

Contents & Figures
Contents
Product Warranty - 2 Year Extended i
Sonifex Warranty & Liability Terms & Conditions i
Unpacking Your Product ii
Repairs & Returns iii
Conformity iii
Safety & Installation of Mains Operated Equipment iii
Voltage Setting Checks iii
Fuse Rating iii
Power Cable & Connection iii
WEEE Directive iv
Atmosphere/Environment iv
Confidence Monitors Introduction 1
Features Summary 2
1. RM-CA2 Confidence Monitor, 2 LED Meters &
2 Analogue Stereo Inputs 3
System Block Diagram 4
2. RM-CAD8 Confidence Monitor, 2 LED Meters,
2 Analogue & 6 Digital Stereo Inputs 4
Front Panel Indicators & Controls 5
Rear Panel Connections & Operation 7
DIPSwitch Settings 8
Technical Specification RM-CA2 & RM-CAD8 10
Figures
Fig 1-1: RM-CA2 Confidence Monitor Front Panel 3
Fig 1-2: RM-CAD8 Confidence Monitor Front Panel 4
Fig 1-3: Confidence 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 5
Fig 1-9: RM-CA2 Left Level or Balance Control and Power
On Indicator 6
Fig 1-10: RM-CAD8 Right Level or Stereo Level Control 6
Fig 1-11: RM-CA2 & RM-CAD8 Meters & Phase Error LED 6
Fig 1-12: Confidence Monitor RM-CA2 Rear 7
Fig 1-13: Confidence Monitor RM-CAD8 Rear 7
Fig 1-14: DIPSwitch Settings 8

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

i
Warranty
Product Warranty - 2 Year Extended
As standard, Sonifex products are supplied with a 1 year back to base
warranty. In order to register the date of purchase and so that we can keep
you informed of any product design improvements or modifications, it is
important to complete the warranty registration online. Additionally, if you
register the product on the Sonifex website, you can increase your product
warranty to 2 years. Go to the Sonifex website at: http://www.sonifex.
co.uk/technical/register/index.asp to apply for your 2 year warranty.
Note: For your own records the product serial number is recorded on the
CE certification page of this handbook.
Sonifex Warranty & Liability Terms & Conditions
1. Definitions
‘the Company’ means Sonifex Ltd and where relevant includes companies
within the same group of companies as Sonifex Limited.
‘the Goods’ means the goods or any part thereof supplied by the Company
and where relevant includes: work carried out by the Company on items
supplied by the Purchaser; services supplied by the Company; and software
supplied by the Company.
‘the Purchaser’ means the person or organisation who buys or has agreed
to buy the Goods.
‘the Price’ means the Price of the Goods and any other charges incurred by
the Company in the supply of the Goods.
‘the Warranty Term’ is the length of the product warranty which is usually
12 months from the date of despatch; except when the product has been
registered at the Sonifex website when the Warranty Term is 24 months
from the date of despatch.
‘the Contract’ means the quotation, these Conditions of Sale and any
other document incorporated in a contract between the Company and the
Purchaser.
This is the entire Contract between the parties relating to the subject
matter hereof and may not be changed or terminated except in writing in
accordance with the provisions of this Contract. A reference to the consent,
acknowledgement, authority or agreement of the Company means in
writing and only by a director of the Company.
2. Warranty
a. The Company agrees to repair or (at its discretion) replace Goods
which are found to be defective (fair wear and tear excepted) and
which are returned to the Company within the Warranty Term
provided that each of the following are satisfied:
i. notification of any defect is given to the Company immediately
upon its becoming apparent to the Purchaser;
ii. the Goods have only been operated under normal operating
conditions and have only been subject to normal use (and
in particular the Goods must have been correctly connected
and must not have been subject to high voltage or to ionising
radiation and must not have been used contrary to the
Company’s technical recommendations);
iii. the Goods are returned to the Company’s premises at the
Purchaser’s expense;
iv. any Goods or parts of Goods replaced shall become the
property of the Company;
v. no work whatsoever (other than normal and proper
maintenance) has been carried out to the Goods or any part of
the Goods without the Company’s prior written consent;

ii
Warranty
vi. the defect has not arisen from a design made, furnished or
specified by the Purchaser;
vii. the Goods have been assembled or incorporated into other
goods only in accordance with any instructions issued by the
Company;
viii. the defect has not arisen from a design modified by the
Purchaser;
ix. the defect has not arisen from an item manufactured by
a person other than the Company. In respect of any item
manufactured by a person other than the Company, the
Purchaser shall only be entitled to the benefit of any warranty or
guarantee provided by such manufacturer to the Company.
b. In respect of computer software supplied by the Company the
Company does not warrant that the use of the software will be
uninterrupted or error free.
c. The Company accepts liability:
(i) for death or personal injury to the extent that it results from the
negligence of the Company, its employees (whilst in the course of
their employment) or its agents (in the course of the agency);
(ii) for any breach by the Company of any statutory undertaking as to
title, quiet possession and freedom from encumbrance.
d. Subject to conditions (a) and (c) from the time of despatch of
the Goods from the Company’s premises the Purchaser shall be
responsible for any defect in the Goods or loss, damage, nuisance
or interference whatsoever consequential economic or otherwise or
wastage of material resulting from or caused by or to the Goods. In
particular the Company shall not be liable for any loss of profits or
other economic losses. The Company accordingly excludes all liability
for the same.
e. At the request and expense of the Purchaser the Company will test
the Goods to ascertain performance levels and provide a report of
the results of that test. The report will be accurate at the time of the
test, to the best of the belief and knowledge of the Company, and the
Company accepts no liability in respect of its accuracy beyond that
set out in Condition (a).
f. Subject to Condition (e) no representation, condition, warranty or
other term, express or implied (by statute or otherwise) is given by
the Company that the Goods are of any particular quality or standard
or will enable the Purchaser to attain any particular performance
or result, or will be suitable for any particular purpose or use
under specific conditions or will provide any particular capacity,
notwithstanding that the requirement for such performance, result or
capacity or that such particular purpose or conditions may have been
known (or ought to have been known) to the Company, its employees
or agents.
g. (i) To the extent that the Company is held legally liable to the
Purchaser for any single breach of contract, tort, representation
or other act or default, the Company’s liability for the same
shall not exceed the price of the Goods.
(ii) The restriction of liability in Condition (g)(i) shall not apply to
any liability accepted by the Seller in Condition (c).
h. Where the Goods are sold under a consumer transaction (as defined
by the Consumer Transactions (Restrictions on Statements) Order
1976) the statutory rights of the Purchaser are not affected by these
Conditions of Sale.
Unpacking Your Product
Each product is shipped in protective packaging and should be inspected
for damage before use. If there is any transit damage take pictures of the
product packaging and notify the carrier immediately with all the relevant

iii
CE Conformity
details of the shipment. Packing materials should be kept for inspection and
also for if the product needs to be returned.
The product is shipped with the following equipment so please check to
ensure that you have all of the items below. If anything is missing, please
contact the supplier of your equipment immediately.
Item Quantity
Product unit 1
IEC mains lead fitted with moulded mains plug 1
Handbook and warranty card 1
GSM stubby antenna 1
If you require a different power lead, please let us know when ordering the
product.
Repairs & Returns
Please contact Sonifex or your supplier if you have any problems with your
Sonifex product. Email [e-mail] for the repair/
upgrade/returns procedure, or for support & questions regarding the
product operation.
Conformity
The products in this manual comply with the essential requirements of the
relevant European health, safety and environmental protection legislation.
The technical justification file for this product is available at Sonifex Ltd.
The declaration of conformity can be found at:
https://www.sonifex.co.uk/declarations
Safety & Installation of Mains
Operated Equipment
There are no user serviceable parts inside the equipment. If you should
ever need to look inside the unit, always disconnect the mains supply
before removing the equipment covers. The cover is connected to earth
by means of the fixing screws. It is essential to maintain this earth/
ground connection to ensure a safe operating environment and provide
electromagnetic shielding.
Voltage Setting Checks
Ensure that the machine operating voltage is correct for your mains power
supply by checking the box in which your product was supplied. The voltage
is shown on the box label. The available voltage settings are 115V, or 230V.
Please note that all products are either switchable between 115V and 230V,
or have a universal power supply.
Fuse Rating
The product is supplied with a single fuse in the live conducting path of the
mains power input. For reasons of safety it is important that the correct
rating and type of fuse is used. Incorrectly rated fuses could present a
possible fire hazard, under equipment fault conditions. The active fuse is
fitted on the outside rear panel of the unit.
Power Cable & Connection
An IEC power connector is supplied with the product which has a moulded
plug attached.
The mains plug or IEC power connector is used as the disconnect device.
The mains plug and IEC power connector shall remain readily operable to
disconnect the apparatus in case of a fault or emergency.
The mains lead is automatically configured for the country that the product
is being sent to, from one of:

iv
Safety & Installation
Territory Voltage IEC Lead Type Image
UK & Middle East 230V UK 3 pin to IEC lead
Europe 230V European Schuko round 2 pin to
IEC lead
USA, Canada and
South America 115V 3 flat pin to IEC lead
Australia & New
Zealand 230V Australasian 3 flat pin to IEC lead
Connect the equipment in accordance with the connection details and
before applying power to the unit, check that the machine has the correct
operating voltage for your mains power supply.
This apparatus is of a class I construction. It must be connected to a mains
socket outlet with a protective earthing connection.
Important note: If there is an earth/ground terminal on the rear panel of
the product then it must be connected to Earth.
WEEE Directive
The Waste Electrical and Electronic Equipment (WEEE)
Directive was agreed on 13 February 2003, along with the
related Directive 2002/95/EC on Restrictions of the use of
certain Hazardous Substances in electrical and electronic
equipment (RoHS). The Waste Electrical and Electronic Equipment Directive
(WEEE) aims to minimise the impacts of electrical and electronic equipment
on the environment during their life times and when they become waste.
All products manufactured by Sonifex Ltd have the WEEE directive label
placed on the case. Sonifex Ltd will be happy to give you information about
local organisations that can reprocess the product when it reaches its “end
of use”, or alternatively all products that have reached “end of use” can be
returned to Sonifex and will be reprocessed correctly free of charge.
Atmosphere/Environment
This apparatus should be installed in an area that is not subject to excessive
temperature variation (<0°C, >50°C), moisture, dust or vibration.
This apparatus shall not be exposed to dripping or splashing, and no objects
filled with water, such as vases shall be placed on the apparatus.

1
Confidence Monitors Introduction 1
Confidence 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 propagation of high power sound waves in such a small
enclosure could have a tendency to produce rattles or move components,
but the Confidence 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 fixings 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, profiled, HF enclosures are used to minimise standing
waves and eliminate response peaks, and acoustic damping in the HF
enclosures is used to reduce colouration, effectively creating a separate,
sealed, infinite-baffle 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 efficient class-D switching amplifier.
Even cable lengths to and from the speaker enclosures have been kept short
to reduce any potential microphonic induction.
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 flatten the frequency
response and the fast-attack DSP loudspeaker limiter protects the drivers
from overload damage.

2
1 Confidence Monitors Introduction
Features Summary
• Anti-vibration steel case.
• Sealed lid with foam cut-outs to dampen lid.
• Multi-point screw fixings ensure lid rigidity.
• Rear connector ports sealed with foam.
• Glue used on components which could move, or vibrate.
• Accurate 3-way speaker system.
• Two mid/high frequency speakers provide excellent stereo imaging.
• Separately driven, forward facing, dual magnet, mono bass driver.
• Custom-moulded, profiled, HF enclosures minimise standing waves.
• Acoustic damping in the HF enclosures reduces colouration.
• Separate, sealed, infinite-baffle enclosure for each driver.
• Magnetically shielded drivers so that the monitors are perfectly safe to
use near CRTs and TFT displays.
• Separate, highly efficient class-D switching amplifier for each speaker.
• Short, even cable lengths to and from the speaker enclosures to reduce
any potential microphonic induction.
• DSP based design allows better audio performance to be realised.
• Active crossover provides perfect separation between mid-range and
bass sounds.
• A universal power supply ensures global voltage operation without
adjustment.

3
Confidence Monitors Introduction 1
1. RM-CA2 Confidence Monitor, 2 LED Meters & 2 Analogue Stereo Inputs
Fig 1-1: RM-CA2 Confidence Monitor Front Panel
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 efficient Class-D amplifiers. Careful attention to driver
selection, materials and case design, plus active DSP equalisation, has
ensured a flat 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.
The RM-CA2 is a 1U rack-mount unit offering 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:
• Stereo signals, with the two front panel control knobs acting as stereo
volume and balance control, to alter the stereo imaging of the left and
right channels, or
• Dual mono signals, with the two front panel control knobs acting as left
and right 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.

4
1 Confidence Monitors Introduction
2. RM-CAD8 Confidence Monitor, 2 LED Meters, 2 Analogue & 6 Digital
Stereo Inputs
Fig 1-2: RM-CAD8 Confidence 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:
• 1 x stereo S/PDIF unbalanced input on RCA phono female.
• 1 x stereo TOSlink unbalanced input on an optical
connector.
• 4 x stereo AES/EBU balanced inputs on XLR 3 pin female.
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 different sample rates to be connected and monitored,
between 32kHz and 96kHz. All other features of the unit are
identical to the RM-CA2.
= 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
System Block Diagram
Fig 1-3: Confidence Monitor Block Diagram

5
Front Panel Indicators & Controls 2
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 Fig 1-7: RM-CAD8 Source Selector Button
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.
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:
• missing,
• has a sample rate outside the acceptable range of the unit,
• contains invalid/non-audio data,
• or is too weak for the receiver to lock on to.
Main Meters
Fig 1-8: RM-CA2 & RM-CAD8 Meters & Phase Error LED

6
2 Front Panel Indicators & Controls
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.
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 off, 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.
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 amplifier. To avoid clipping or overflow conditions a limiter
function is applied. The limiter is applied independently to each channel and
has an instantaneous attack with a slow release.

7
Rear Panel Connections & Operations 3
While the limiter is active the left hand LED will flash. If the LED is
continually flashing then the level potentiometer setting should be reduced
so that the LED is always on or only flashes 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 flashing 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 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.

8
3 Rear Panel Connections & Operations
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.
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 off.
Level/Balance Control Selection - DIPSwitch 3
This DIPSwitch switches the level and balance controls between
independent left and right level (switch off) 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.

9
Rear Panel Connections & Operations 3
Meter Characteristic Selection - DIPSwitch 7
This DIPSwitch changes the metering characteristics between VU (off) 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 off
position.

10
4 Technical Specification RM-CA2 & RM-CAD8
Inputs
Audio Inputs (RM-CA2): 2 x stereo analogue (1 x XLR balanced,
1 x XLR balanced or RCA phono unbal)
Audio Inputs (RM-CAD8): 2 x stereo analogue (1 x XLR balanced,
1 x XLR balanced or RCA phono unbal)
4 x stereo XLR balanced AES/EBU digital
1 x stereo RCA phono S/PDIF digital
1 x stereo optical TOSLink digital
Max Level (0dB Input Gain): +18dBu (analogue)/0dBFS (digital)
CMRR: >60dB typical
Analogue Input Impedances: XLR: >20kΩ balanced bridging
RCA: >10kΩ unbalanced
Digital Input Impedances 110Ω ±20% AES/EBU balanced I/O
(RM-CAD8 only): 75Ω ±5% S/PDIF unbalanced I/O
AES/EBU Sample Rate: 32 to 96kHz, converted internally to 48kHz
(RM-CAD8 only):
Input Gain: +10dB on unbalanced analogue input
Selection: Front panel push button with indicator LEDs
Line Level Outputs
Audio Outputs: 1 x stereo analogue
Gain re Selected Input: Unity or -10dB (switchable) & level control
from front panel
Maximum Output Level: +18dB
Output Impedance: <50 ohms
Distortion: <0.02% (1kHz, +8dBu output)
Noise: -95dB RMS, unity gain ref
+8dBu output
Frequency Response: 20Hz-20kHz +0/-0.5dB
Crosstalk Analogue I/O, ref 0dBu
1kHz input: <-90dB
10kHz input: <-85dB
Amplifier/Loudspeakers
Configuration: Three-way with stereo mid/
high-frequency drivers & mono
low-frequency driver
Power Output: 2 x 7W (HF) + 15W (LF) with protective limiter
Crossover: 250Hz (24dB/octave, Linkwitz-Riley)
Distortion (HF Outputs): < 0.1% (1kHz, 3W output)
Distortion (LF Output): < 0.1% (100Hz, 6W output)
Noise: More than 102dB below full output
Volume: Mute to full volume via front panel rotary
control (mute, -52 to +18dB)
Balance Trim: ±6dB via front panel rotary control.
Peak Acoustic Level: 96dB SPL @ 2ft
Level & Phase Metering
Number: 2 x 8-segment LED bargraphs
Line-Up Level: 0dB on scale can be set to 0dB or -10dB
for analogue input 2 via rear panel DIP switch
Phase Meter: Single LED indication showing error
Connectors
Audio Inputs 4 x XLR 3-pin female balanced
(RM-CA2): 2 x RCA female phono unbalanced
Technical Specification RM-CA2 & RM-CAD8

11
Technical Specification RM-CA2 & RM-CAD8 4
Audio Inputs 4 x XLR 3-pin female analogue
(RM-CAD8): 2 x RCA phono analogue
4 x XLR 3-pin female AES/EBU digital
1 x RCA phono female S/PDIF digital
1 x optical TOSLink digital
Audio Outputs: 2 x XLR 3-pin male (balanced, may be
unbalanced)
Headphones: 1/4” (6.35mm) A-gauge 3-pole stereo
jack socket
Mains Input: Filtered 3-pin IEC male, continuously
rated 85 - 264VAC, 47 - 63Hz, fused,
60W peak, 30W average
Fuse Rating: Anti-surge fuse 2A 20 x 5mm
Equipment Type
RM-CA2: Confidence Monitor, 2 LED meters,
2 analogue stereo inputs
RM-CAD8: Confidence Monitor, 2 LED meters,
2 analogue & 6 digital stereo inputs
Physical Specification
Dimensions 48cm (W) x 27cm (D) x 4.4cm (H) (1U)
(Raw): 19” (W) x 12” (D) x 1.73” (H) (1U)
Dimensions 57cm (W) x 52cm (D) x15cm (H)
(Boxed): 22.4” (W) x 20.5” (D) x 5.9” (H)
Weight: Nett: 4.5kg Gross: 6kg
Nett: 10lb Gross: 13.2lb

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