Ampetronic DLS User manual

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Domestic Loop System (DLS)
Induction loop system for office and home
Manual and instructions for use
This manual is intended to accompany the Ampetronic DLS
(Domestic Loop System). The manual is a detailed guide to
making the most of the DLS system, how to install it and how
to use it. Installing, setting up and using the DLS induction
loop system is very simple and requires no special skills or
experience, however the manual will guide you through the
whole process in detail.
IMPORTANT SAFETY INSTRUCTIONS ...............................................2
WARRANTY ..........................................................................................2
DECLARATION OF CONFORMITY ......................................................2
1YOUR AMPETRONIC DLS .............................................................3
2INDUCTION LOOP SYSTEMS – THE BASICS .............................. 5
3THE AMPETRONIC DLS AMPLIFIER ............................................6
4DLS COMPONENTS....................................................................... 7
5BEFORE INSTALLING ...................................................................8
6INSTALLING THE AMPLIFIER.......................................................8
7INSTALLING THE LOOP................................................................9
8CONNECTING SOUND SOURCES ..............................................11
9SETTING UP FOR FIRST USE.....................................................13
10 TROUBLESHOOTING ..................................................................14
11 SYSTEM SPECIFICATION ...........................................................15

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IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions for future reference.
3. Heed all warnings.
4. It is important to follow all instructions.
5. Do not use this equipment near to water.
6. Clean only with a dry cloth.
7. Do not place objects filled with water such as a vase near or on the
equipment.
8. Do not install the DLS amplifier near to sources of heat such as radiators,
stoves or other equipment producing heat.
9. Do not place the DLS amplifier in a fully enclosed space; ensure that the
amplifier has ventilation when in use.
10. This equipment is designed only for servicing by qualified personnel.
Servicing is required when the apparatus has been damaged or exposed to
rain or moisture, or has been dropped.
WARRANTY
This product carries a two year parts and labour guarantee which may be
invalidated if instructions are not followed correctly or if the unit is misused or used
for an unintended purpose.
Refer all enquiries relating to the product guarantees to your reseller or distributor.
DECLARATION OF CONFORMITY
Manufacturer: Ampetronic Ltd.
Northern Road, Newark, NG24 2ET. United Kingdom.
Declares that: Ampetronic Domestic Loop Amplifier, type name ‘DLS’
Conforms to the following directives and norms:
Directive 2004/108/EC
EMC:EN61000-6-3:2007 Emission
EN61000-6-1:2007 Immunity
Directive 2006/95/EC
Safety: EN60065: 2002
22
nd
November 2007
Leon Pieters, Technical Director
Ampetronic Ltd.

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1 YOUR AMPETRONIC DLS
Your Ampetronic DLS will deliver excellent sound quality directly to hearing aids or
special receivers, allowing users to hear direct high quality sound from any source, for
example televisions, telephones, computers and doorbells. If you or people you know
have a hearing impairment, the Ampetronic DLS can be very valuable and can
dramatically improve quality of life within your own home or office.
How will the Ampetronic DLS help you?
BE INDEPENDANT
You will be in complete control of the volume that you hear without
affecting others – no more arguments over the TV volume!
BE IN CONTROL
You can combine sounds from many sources, for example television,
computer, telephone and a microphone so they are all at the ideal
volume with no adjustment of hearing aids or sound sources.
HEAR CLEARLY
You can turn off all interfering background noise and hear only the
sounds that you want to hear, improving concentration and reducing
tiredness, and making listening to any sounds much more enjoyable.
BE SAFE
You can make sure that any alert or warning such as a fire alarm or
doorbells can override whatever you are listening to, ensuring you
never miss a phone call, a visitor, or an emergency.
Key features of the Ampetronic DLS
Excellent sound quality World leading
technology used in professional audio
systems around the world - no
compromise in sound quality.
Multiple inputs Up to 4 different sound
sources can be used simultaneously
Automatic volume control Volume
automatically adjusts, however loud or
quiet the TV programme or phone call –
you do not need to adjust anything.
Design and safety standards
Designed to the highest safety
standards for your piece of mind.
Automatic priority switching for
‘alerts’ An alert input sound will stay off
until an alarm rings or similar sound is
heard, then it will override any other
sound to ensure that you hear the
warning sounds.
Discrete Designed to be elegant and
discrete for either home or office
environments
Simple installation Suitable for
installation by anyone – no experience or
knowledge required.

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1.1 How and where can you use the DLS?
The Ampetronic DLS is suitable for use in the home or office, wherever you might need
to hear entertainment, communications or alarms. The amplifier can be installed in
any indoor environment and used wherever you want to be.
The Ampetronic DLS transmits sound directly to a hearing aid or receiver as safe and
invisible magnetic waves. The sound can be received when the user is within a loop,
which can be very small – as small as a single chair or sofa – or which can be around
a room or area up to 5 x 6m or 30m
2
(a larger room or area can be used if a lower
signal strength is acceptable which will depend greatly on your hearing aids or
receiver).
The amplifier can take up to 4 different sound sources simultaneously, from a very
wide range of possible sources, allowing you to fit the DLS system to match your
lifestyle…
1.2 Induction loop systems in public places
Your DLS amplifier is only one form of induction loop system – you can benefit from
this technology outside of your home or office too! You may want to know where you
can get this benefit in public. Typically where an induction loop system is installed for
your use you will see a sign like this…
Where you see the sign you should be able to switch your
hearing aids to the ‘T’ setting (unless they switch automatically)
or use an induction loop receiver. Where you don’t see the
sign, don’t forget to ask why there is no induction loop!
The variation in use of induction loop systems is significant
from country to country so you will get the best information on
where and how they are used by contacting the hard-of-hearing organisation in your
country, by asking your hearing specialist or through an Ampetronic sales agent in
your country.

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2 INDUCTION LOOP SYSTEMS – THE BASICS
The Ampetronic DLS is an Induction Loop System. Induction loops are an excellent
way to help anyone with a hearing impairment hear an audio communication or
broadcast, both in public and in the home or office. Induction loop systems are often
used in public environments from ticket counters and intercoms through to theatres
and cinemas. In many countries induction loops are already the standard solution for
helping the hard-of-hearing to gain fair access, and can be found installed in most
public environments in the UK and parts of Scandinavia.
An induction loop system consists of four parts:
1 2 3 4
Amplifier
Sound
sources Wire loop Hearing aids / receiver
1 2 3 4
Amplifier
Sound
sources Wire loop Hearing aids / receiver
1. One or more sound sources – the sounds that you want to listen to directly,
for example your television, hi-fi system, computer, telephone, a microphone,
or alerts such as a doorbell or fire alarm
2. An induction loop amplifier – a special amplifier that is connected to the
various sound sources and amplifies the sound as an electrical signal into a
loop
3. A wire loop – a loop connected to the induction loop amplifier which goes
around the area in which you would like to use the system, for example around
the outside edge of your room, or around a small area such as a chair or sofa.
The loop transmits the sound as a completely safe and invisible magnetic field
in the area above the loop.
4. Receivers, usually hearing aids – a small coil picks up the sounds broadcast
through the loop. Coils – sometimes known as ‘T-coils’ or ‘telecoils’ – are
often found within hearing aids, either with a small switch marked ‘T’ or
automatically switching.
Once an induction loop system has been installed and set-up it should require no
attention, adjustment or maintenance. At any time a user can switch their hearing aids
or use their receivers to hear the sounds being broadcast into the loop system.

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3 THE AMPETRONIC DLS AMPLIFIER
FEATURE DESCRIPTION
1. TONE CONTROL Tone control, normal response with knob at centre and marker
pointing up. Adjust to give your preferred sound.
2. VOLUME CONTROL To adjust volume transmitted by the loop.
3. SIGNAL INDICATOR When lit, the input level is high enough to ensure that the loop
will be loud enough. Normally on when sound is present.
4. HEADPHONE SOCKET Monitors the signal that is actually broadcast into the loop.
Useful for setting up the loop and fault finding.
5. POWER SWITCH To turn power on and off. The Ampetronic DLS can be left on at
all times, or turned off when not used as preferred.
6. POWER INDICATOR Green light, on when the unit has power and is turned on.
7. RUBBER FEET To isolate the unit from vibration and heat and provide a secure
and stable base in any installation.
8. LOOP CONNECTOR Speaker style connector for the two cable ends of the loop.
9. POWER CONNECTOR Power connector for the 12V DC power supply provided.
10. INPUT 1 Audio input with twin RCA connectors (see section 8)
11. INPUT 2 Audio input with twin RCA connectors (see section 8)
12. INPUT 3 (ALERT)
SWITCH
Selects line level (right) or microphone (left) for input 3
13. INPUT 3 (ALERT)
LEVEL ADJUSTER
Adjusts sensitivity of input 3, setting the level at which a noise
will trigger the alert (priority) input
13. INPUT 3 (ALERT) Alert input – sounds at this input will override other inputs, and
be turned off when not in use
14. INPUT 4 LEVEL
ADJUSTER
Adjusts sensitivity of microphone input 4 as required
15. INPUT 4
(MICROPHONE)
Microphone input for electret style microphone (provided) with
minijack input
1 2 3 4 5 61 2 3 4 5 6
7 8 9 10 11 12 13 14 14 157 8 9 10 11 12 13 14 14 15

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4 DLS COMPONENTS
The DLS kit contents:
•DLS amplifier and instructions (1)
•30m loop cable and cable clips (2)
•1 x Clip microphone and cable (3)
•1 x Mini-jack cable (4)
•1 x RCA cables (5)
•1 x power supply (6)
Additional accessories
Available through your local dealer.
•Chair pad (7)
A 40cm square pad to place
under or in a cushion on a chair
or sofa, to create a local field for
one person, often instead of
using the room loop cable.
•Telephone adaptor (8)
To connect a phone line or
phone network to the DLS unit
•SCART adaptor (9)
To connect a television to the
amplifier using a ‘through-
SCART’ connection that does
not affect your existing SCART
connections.
•Additional cables and
microphones
(1)
(2)
(3) (4)
(5) (6)
(7)
(8) (9)
Phone adaptor
provided separately

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5 BEFORE INSTALLING
Before the DLS system is installed
please check that your environment is
suitable and that you have appropriate
receivers or hearing aids as follows.
What receivers or hearing aids will
you use?
To hear the output from the
Ampetronic DLS you must use a
receiver. For most people this will be
hearing aids, which typically contain a
telecoil or ‘T’ function. Hearing aids
must be switched to the ‘T’ setting –
some hearing aids automatically
switch to the ‘T’ setting, others have a
manual switch. Check with your
hearing advisors or hearing aid
suppliers if you are unsure of how to
use your hearing aids with an
induction loop system.
Without hearing aids the user needs to
use a receiver and headphones to
hear the output from the Ampetronic
DLS. The supplier of your Ampetronic
DLS can help you to find a suitable
receiver.
Other loop systems
The DLS loop system will create a
strong signal that you can hear within
the area of the loop. There is also a
much weaker signal that carries up to
10m away from a room loop. This can
occasionally cause a problem if:
- there is another ‘room loop’
induction loop system in use within
10m of your room – you may pick
up interference from this loop
system which you can hear in your
room, or you might create
interference in someone else’s
loop.
- you use the system for confidential
or private conversations with
microphones or the telephone that
you do not want others to be able to
hear.
Both of these problems can be avoided
by using a chair pad accessory instead
of a room loop.
Background noise
Occasionally poor quality electrical
systems can create interference that
you will hear if you try to use an
induction loop system. Before installing
the DLS, turn on your receiver or turn
your hearing aids to the ‘T’ setting – if
you hear a lot of background noise or
hum then your room may not be
appropriate for an induction loop
system. Ask you supplier for advice if
this happens.
6 INSTALLING THE
AMPLIFIER
Where will you put the DLS
amplifier?
The DLS amplifier should be placed
somewhere where:
•cables for each sound source can
reach the amplifier
•cable for the loop (chair or room loop)
can reach the amplifier
•volume and tone controls can be
adjusted by the user
The DLS amplifier can stand
horizontally or be mounted on a panel
(for example underneath a desk) or on
a wall as shown on the next page.
Installing the amplifier
Find a suitable location for the amplifier
at which there is access to power, to
cables from the sound sources and for
the loop cable.

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The amplifier can either be
freestanding or wall / panel mounted –
see below for wall / panel mounting
instructions.
The location for the DLS amplifier
must be indoors and dry. The DLS
amplifier must not be covered by
material of any kind, and must have
some air movement around the case
to prevent heat build up.
Place the amplifier in its required
location but do not connect the power
lead until installation is complete.
Wall / panel mounting
Included in the DLS amplifier box is a
template for marking out the two screw
holes.
Decide on the location for the DLS
amplifier and use the template to mark
out two screw holes. Put two screws
in place (screw heads should be 6-
8mm diameter). Leave the screw
heads protruding by 8-10mm from the
wall. Hang the DLS amplifier on the
screw heads using the holes on the
bottom of the case.
7 INSTALLING THE LOOP
Room loop installation
For moving, standing up or in different
locations within a room.
A room loop is a loop of wire usually
placed around the wall or skirting board
around the edge of the room.
A wire can also be used around a
smaller area underneath carpet or a
rug. The loop must cover the whole
area in which the user needs to hear
the sound from the DLS induction loop.
A room loop is simple to install but does
require you to be able to run a cable
around your room and fix it safely using
the cable clips provided, or another
fixing method.
•Decide what the area is that needs
to be covered by the cable.
•Start with one end of the cable at
the DLS amplifier.
•Run the cable from the cable reel
provided around the edge of the
area that is required to be used.
Typically this will be the edge of a
room.
•Use cable clips (provided) to
secure the loop cable, or place the
loop cable underneath a rug or
carpet.

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•The cable should ideally be fitted
at floor or ceiling level, never at
head height. The diagram shows
both options as a green and a red
loop.
•Cable can run over doorways to
prevent trip hazards, see the red
loop in the diagram.
•Run the free end of the cable
back to the DLS amplifier.
•Connect the cable ends to the
amplifier – see the end of this
section.
•The room loop is now installed.
Dealing with excess cable
If there is a large amount of excess
cable (more than half of the reel) then
it needs to be wound carefully or
removed. Please note that the
minimum cable length for the system
is 8m.
The excess wire can be cut
away with scissors or wire
cutters. The end of the cable
needs to have the plastic
sheath removed to expose the metal
ends as shown:
If you can not or do not want to
remove the excess wire, coil the
remaining wire as follows:
•Both ends should be connected to
the amplifier as instructed above.
•Identify the point of the free cable
that is the end of the useful loop –
fix or hold this temporarily to the
amplifier.
•Pull out the remaining cable into a
loop and pull it away from the
amplifier so it forms two parallel
cables with a sharp bend in the
end.
•Coil the two parallel cables
together, tie, tape or otherwise fix
the coil in place.
Chair loop installation
The Chair
Loop pad is
an optional
accessory.
The pad
comes with
5m of cable
attached to
allow you to
sit anywhere
within the
room, and a
connector for
easy removal
or connection.
Make sure
that the pad
can be placed
under or
behind the chair that needs to be used
and the cable can be run safely from
the chair to the DLS amplifier.
•Place the pad in one of three
places: under the seat cushion;
behind the seat back; or inside a
seat cushion (seat or backrest)
•Run the connecting cables to the
DLS amplifier.
•Cover the cable with a rug or other
protection to prevent tripping or
catching the cable.
•Connect both ends of the loop
cable to the DLS amplifier, see the
end of this section
•The chair loop is now installed.