Opus Technologies LD Series User manual

EN
Installation and user
manual
LD 1.0 / 2.0 / 3.0
Class D loop amplifier LD Séries
PERIMETER LOOP AMPLIFIER

User Manual 2
User Guide EN 1
1. Intro 4
1.1 Purpose 4
1.2 Targeted audience 4
1.3 Warnings 4
1.4 Icons 4
2. Presentation of the amplifier 5
2.1 Description 5
2.2 The range 5
2.2 Packing list 5
2.3 OP-R (option) 5
2.4 Advices and safety 6
3. Technology presentation 7
3.1 What is an induction loop system? 7
3.2 Working principles 7
4. Controls, Connections and Settings 8
4.1 Controls 8
4.2 Multi-loop output 8
4.3 Front panel and settings 9
4.4 Back side and settings 10
4.5 Racking 11
4.6 Adjustments and connections 12
4.7 Connections of two amplifiers 12
TABLE OF CONTENTS| EN
LD Series | Installation and user manual |

User Manual 3
5. Setting up 17
5.1 Setting a single loop 17
5.2 Setting up a master amplifier and a slave amplifier 17
5.3 Locking settings 17
5.4 Metal loss compensation adjustment 18
5.5 Operation of the fault contact 18
5.6 Audio Input 18
6. Understanding and planning of a loop system 19
6.1 Preamble 19
6.2 Basic principles 19
6.3 The different types of implantation 20
7. The magnetic induction loop 22
7.1 Placing the loop 22
7.2 Thickness of the wire 22
7.3 The magnetic field 22
7.4 Connections 22
7.5 Loop layouts simulation 23
8. Installation constraints 26
8.1 External overspill 26
8.2 Distortion due to metal 26
Certificate of conformity to IEC 60118-4 standard 27
TABLE OF CONTENTS| EN

User Manual 4
ENGLISH
1. Intro
Thank you for have purchasing an Opus
Technologies Induction Loop Amplifier.
Please take a few moments to read this manual. It
will ensure you the best use of the product and
many years of service.
1.1 Purpose
The user manual provides the necessary information
for installing, configuring and using an LD series
amplifier.
1.2 Targeted audience
The installation and user's manual is intended for
installers and users of LD Opus Technologies series
amplifiers.
1.3 Warnings
This user guide relates to three types of alerts.
The type of alert is closely related to the effect that
may occur if this one is not observed. These alerts,
ranked in ascending order of severity, are as follows:
Note
Additional information. Generally, the non-
observance of a Note type alert does not lead to any
material or bodily injury.
•Attention
Failure to observe a caution alert may result in
property damage.
•Warning
Failure to observe a warning alert can result in
severe personal injury and property damage.
1.4 Icons
1.4.1 Icons and notes
Icons used with notes provide additional information
about the note.
See the following examples:
1.4.2 Icons of attention, warning and danger
The icons used in combination with Attention,
Warning and Danger indicate the type of risk
present.
See the following examples:
Note:
General icon of the notes
Note:
Symbol referring to the
indicated information source.
Attention, warning, danger :
Electrocution risk icon.
Attention, warning, danger :
General icon of precautionary statements,
warnings and dangers.
Attention, warning, danger :
Risk icon of electrostatic discharge.
LD Series | Installation and user manual |

User Manual 5
2. Presentation of the amplifier
2.1 Description
The LD Series range includes induction loop
amplifiers made to equip voiced rooms for
people with hearing loss.
The LD Series has been developed with strict and
rigorous specifications that allow us to offer a 5
year warranty. The products have been designed
with options to facilitate their use and their
installation.
Product photo Figure 1
Perimeter amplifiers composed of LD1.0, LD2.0
and LD3.0 cover different surfaces described
below.
2.2 The range
The LD1.0, LD2.0 and LD3.0 Opus Technologies
are new generation of induction loop amplifiers
and French manufacture.
The amplifiers, are the most compact on the
market while offering the necessary features
(AGL, MLC, compressor, etc.) to ensure
installation for rooms ranging from 100m² to
1000m² :
· LD 1.0 covers 250 m² - max width: 10m
· LD 2.0 covers 450 m²- max width : 15m
· LD 3.0 covers 1000 m² - max width : 20m
These coverage data are indicative, they meet
the international standard IEC-60118-4.
However, depending on the configuration of the
room (step, height installation, etc.) these room
widths do not meet the requirements of IEC-
60118-4,so it is important to call a specialist.
You can also use our simulation software or get
closer to your local dealer for more information
2.3 Packing list
Upon receipt of the amplifier inspect the unit
and look for any damage that may have
occurred during transport. If it is damaged
notify your distributor and the shipping
company immediately, stating the delivery date,
the nature of the damage and if no damage was
visible on package before unpacking. If possible
give the delivery number and a tracking number.
Inside your box:
•LD1.0, LD 2.0 or 3.0 amplifier
•Power cord
•2x 3-point connectors
•1x 2-point connectors
•1x 2-point connectors
•A set of 2 stickers "space adapted for the
hearing impaired
•A guide to installation and use
•OP-R (option)
2.4 OP-R (option)
Content of the OP-R
2x rack mounting brackets
•2x brackets
•8x fixing screws
Product photo - Figure 1
LD Series | Installation and user manual |

User Manual 6
2.4 Advices and safety
The majority of problems with the induction loops
happens when the installation has not been properly
reflected so let's take a little time before starting the
installation and gain in result and time.
Ideally, the loop amplifier should be placed near the
area to be covered. This may involve placing the
amplifier on a panel, under a desk, or under a
counter.
See figure 9 page 17
To position the loop in the space to be equipped, it is
important to take into account the future users of
the system.
For example, if you only need to have the speaker
and the client, a reduced coverage with a centered
loop may be a better solution than a loop around the
perimeter of the room. It will limit radiation and
increase confidentiality.
LD Series | Installation and user manual |

User Manual
3. Technology presentation
3.1 What is an induction loop system?
An hearing loop (also know as Audio Frequency
Induction Loop System)), is a help system for people
with hearing loss. With this system, the sound from
a speaker's microphone, PA equipment, TV set, etc.
is transmitted wirelessly to the hearing aid of the
person who can hear it without being hampered by
any ambient noise. This system is mainly used in
public places (conference rooms, cinemas, courts,
churches, counters, etc.) but can also be installed at
home. A large part of hearing aids incorporate the
"T" loop function.
3.2 Working principles
An induction loop system is installed mainly in a
room. The installation consists of an electrical wire
that travels around the perimeter of the room
forming a loop. Both wire tips are connected to an
audio amplifier. The hearing aid has a coil often
called "T Position" or "T-coil". This coil, placed inside
the prosthesis, is also made of a wire that makes a
large number of turns. The magnetic field generated
by the large loop around the room will cross the
small loops in the prosthesis and, by the induction
principle, the electrical signal present in the large
loop will be found in the small one. This transmits
the signal of the audio amplifier to the prosthesis,
which will then return it to the ear of the hearing-
impaired person.
Diagram of operation of a hearing aid with “T” position - Figure 3
The sound source can be anything. In a cinema, for
example, the sound of the film will be transmitted .
In a conference room, is the sound of the speaker's
microphone. In a metro station, the voice of the
agent, etc.
The loop can be installed at the floor or ceiling level,
more precisely between 1.10m and 2.20m from the
listening height (ears). The loop is integrated in the
building, as is the electrical installation.
The presence of a hearing loop is often indicated by
a blue logo representing a barred ear and a letter
"T".
7
Pictogram used to signal the presence of a
induction loop system -Figure 2
LD Series | Installation and user manual |
Micro
Coil
Selector Corrector Amplifier Micro-speaker

4. Controls, Connections and Settings
4.1 Controls
The amplifiers integrate a fault system which makes
it possible to control the main functions of the
equipment: like the power amplifier, the integrity of
the loop cable connected to the amp and the inputs.
If one of the functions is faulty, an LED on the front
panel of the amplifier will not work.
4.2 Multi-loop output
The LD2.0 and LD3.0 amplifiers have two 0 ° and 90 °
outputs and one input on the rear panel (See Figure
4on page 41), these options do not exist on the
LD1.0. This feature offers the possibility to couple
multiple amplifiers together.
Depending on the implementation of the loops, the
aim is to control the external radiation of the field
and/or the homogeneity of coverage in the coverage
area.
See Implantation section page–51
This type of functionality is important in order to
explore all the possibilities of using a loop system.
For more information on using the input and slave
outputs, and to find out the best loop layout
according to your project please use SmartLoop
software or contact us at contact@opus-
technologies.com.
User Manual 8
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User Manual 9
4.3 Front panel and settings
1. LED «Protect», fault display. This LED is displayed when the power amplifier, loop or priority input is in fault.
2. LED "Loop", presence of loop. This LED is displayed when the loop is cut or its impedance is not suitable
3. Current output setting. Used to control the output electric current diffused in the loop
4. Input 3 setting (100V).Used to control the signal of input n°3.
5. Input 2 setting (Line or microphone). Used to control the signal of the input n°2.
6. Input 1 setting (Line or microphone). Used to control the signal of the input n°1.
7. ON /OFF power button
8. LED 'Clip', display saturation amplifier. This LED is displayed when the amplifier goes into safety mode.
9. Power LED, ON /OFF display. Power indicator light on the device
10. Meter input signal. Indicates the level of the input signal after setting from -26dB to 0dB.
11. Meter signal output. Indicates the electric current in the induction loop.
12. MLC (Metal Loss Compensation) adjustment reduces interference problems with metal structures.
LD Series | Installation and user manual |
ENGLISH
Front Panel- Figure 4

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LD Series | Installation and user manual |
4.4 Back side and settings
14. Audio Input n°1 Combo: Mic or Line. This input is used to connect external audio inputs from a line-level source
(mixer, preamp, etc.) or a microphone. The Combo connector accepts an XLR or a 6.35 jack.
15. Push button for line or microphone communication of the input 1. allows to switch the input according to the
source (microphone or line).
16. Push button for line or microphone communication of the input 2. Allows to switch the input according to the
source (microphone or line).
17. Phoenix type 2 terminal block input: microphone or line. This terminal block input is used to connect external
audio inputs from a line-level source (mixer, preamp, and) or microphone.
18. 3 terminal block type Phoenix input: 100V priority. This terminal block input allows you to connect an external
audio input from a 100V sound system, the audio is directly recovered from the loudspeakers line
19. IN slave input. This input is used to connect a 0 ° or 90 ° output (Master / Slave) of another LD loop amplifier.
20. 0 ° or 90 ° output to slave amplifier. These outputs are used to connected the Master amplifier to a Slave loop
amplifier of the LD range.
21. Location of the serial number label.
22. AC power cord connection. Connect the loop amplifier to the Master.
23. Phantom power selection switch. Send or not the supply voltage of a microphone.
24. NO /NC fault synthesis relay. Allows system status information to be forwarded via a relay.
25. Loop output on terminal block type Phoenix. Connect the wired loop to the amplifier.
Back Side - Figure 5