Signet DL50/K Instructions de montage

Approved Document No. DAU0000050 Rev 2• Page 1

DL50/K

AUDIO-FREQUENCY

INDUCTION LOOP KIT

INSTALLATION &

SET-UP MANUAL

Please read these instructions carefully before

installing your DL50 induction loop system

About this kit .............................................................................................. 2

What is an induction loop system? .......................................................... 2

Familiarisation with your DL50 induction loop amplifier ...................... 3

Planning the system .................................................................................. 4

Safety precautions ...................................................................................... 6

Connecting the unit ................................................................................... 6

System set-up and testing ......................................................................... 8

Troubleshooting ......................................................................................... 10

Technical specification .............................................................................. 11

improvement & reserves the right to alter product specifications at its discretion & without prior notice.

Approved Document No. DAU0000050 Rev 2•Page 12

Induction loop systems allow hearing impaired people to hear more clearly.

Most hearing aids have a ‘T’ or ‘MT’ switch which allows them to pick up the

electromagnetic field generated by a telephone earpiece. This signal is converted by the

hearing aid into a sound suited to its user’s specific hearing requirements.

An induction loop system uses this same principle but generates a much larger magnetic

field than that created by a telephone earpiece and radiates it around a room via a ‘loop’ of

cable. Any hearing impaired person positioned within the loop can hear the loop signal by

switching their hearing aid to the correct position.

An induction loop system therefore comprises four main elements:-

The audio source – typically a microphone, a television or a radio (or any combination of these).

The induction loop amplifier

The loop – a single turn of wire usually run around the perimeter of the room.

The receiver(s) – any behind-the-ear type hearing aid with a ‘T’ or ‘MT’ switch.

The Disability Discrimination Act has led to an increasing number of induction loop systems

being fitted in cinemas, theatres, churches, post offices, etc, allowing people with hearing

difficulties to participate fully in general conversation, public performances and other

social/work related activities. This kit, specially designed by one of the UK’s leading

manufacturers of induction loop equipment, helps you to bring these same benefits into

the comfort of your own home.

About this kit

What is an induction loop system?

This kit includes everything you need to create a high quality stand-alone loop system for a

living room, bedroom, TV lounge, study or any other room up to 7m x 7m (23ft x 23ft) in size.

Please ensure that the following accessories are included in your kit:-

1 x DL50 audio frequency induction loop amplifier

1 x Plug-top power supply

1 x 33m (108ft) reel of induction loop cable

1 x SCART to phono audio connection lead

1 x Microphone c/w 1.5m (5ft) lead and mounting attachments

1 x Installation manual (i.e. this manual)

1 x Accessory pack containing four stick-on cabinet feet and a small flat-headed screwdriver

Should any of the above items be missing, please contact your vendor.

Approved Document No. DAU0000050 Rev 2•Page 2 Approved Document No. DAU0000050 Rev 2•Page 11

Technical specifications

POWER REQUIREMENTS 12V a.c. 1.5A max (via plug-top power supply)

MAX. COVERAGE AREA 50 square metres (7m x 7m or 23ft x 23ft)

CONTROLS Input signal level control

Tone control (boost +16dB; cut -20dB at 1KHz)

Loop signal control

Microphone priority control

(all controls are screwdriver adjustable to prevent them being

accidentally altered once they have been set up)

INDICATORS Power on (green)

Input signal (red)

Loop strength meter (green to yellow to red)

INPUTS Two 3.5mm mono microphone inputs with phantom power

Two phono (line level) inputs

Alert trigger input - normally open (close to trigger)

OUTPUTS One loop output (via push-and-hold connector) - only use the

loop cable supplied with your DL50/K kit

One headphone output (confirms audio input signal level)

DIMENSIONS 40mm (Height)

85mm (Depth)

185mm (Width)

WEIGHT 550g (amplifier only)

Approved Document No. DAU0000050 Rev 2•Page 10 Approved Document No. DAU0000050 Rev 2•Page 3

Familiarisation with your DL50 induction loop amplifier

Below is an overview of the indicators, controls and connectors on your DL50 induction

loop amplifier. The amplifier has one set of phono inputs (for the direct connection of

televisions, etc), two microphone inputs and an alert input (the alert input is normally used

for special applications only). It also includes four screwdriver-adjustable level controls plus

a number of indicators to assist you in setting up the system. Connections are also provided

for the attachment of the induction loop cable.

Detailed connection diagrams, system planning and system set-up information can be

found later in this manual.

LOOP

OUTPUT

CONNECTOR

MICROPHONE

PRIORITY

CONTROL

12V a.c. 1.5A

PLUG-TOP

POWER SUPPLY

CONNECTION

ALERT

INPUT

CONNECTOR

PHONO

INPUT

CONNECTORS

MIC. 1

INPUT

CONNECTOR

MIC. 2

INPUT

CONNECTOR

DL50 amplifier : front view

DL50 amplifier : rear view

TONE

CONTROL

HEADPHONE

SOCKET

INPUT SIGNAL

LEVEL CONTROL

INPUT

SIGNAL

INDICATOR

LOOP

STRENGTH

METER

POWER ON

INDICATOR

LOOP

SIGNAL

CONTROL

(in icates the

power being

riven into

the loop)

If no sound is being picked up by the hearing aid or induction loop test receiver, first check

that the amplifier’s power indicator is lit.

Troubleshooting

If the power indicator IS lit:-

Check that the amplifier’s input signal

indicator is lit.

If the input signal indicator IS NOT lit, make

sure all microphone and audio connection

leads are correctly plugged in.

Adjust the amplifier’s input signal and

microphone priority controls until its input

signal indicator flickers.

If there is still no sound being picked up by

the hearing aid or induction loop test

receiver, check that the loop cable is not

broken or misconnected.

Tip: The loop strength meter WILL NOT

illuminate if there is a break in the loop

cable or if it is misconnected.

If the power indicator IS NOT lit:-

Check that the plug-top power supply is

correctly plugged into the mains supply

and the amplifier.

If the power indicator is still not lit, the

power supply or the amplifier could be

faulty. Return the amplifier and PSU to

your vendor for repair.

Approved Document No. DAU0000050 Rev 2•Page 4

Microphones

One microphone is

supplied with the DL50

and this is sufficient for

most applications. It is

normally positioned where

it will best pick up general

conversation and/or the

sound of telephones or

doorbells ringing.

Loop cable

The loop cable (supplied) should be run around the perimeter

of the room. It should be located at least 1.2 metres away

from the nearest hearing aid and is therefore best tucked under

the edge of the carpet or fixed to skirting boards or the ceiling.

Should you encounter a doorway, window or passageway,

run the cable up and over (using cable clips) or below the

obstruction but try to keep such deviations to a minimum.

Ensure that the cable is adequately protected from being

crushed in walkways and by furniture.

Audio input

Most televisions, DVD

players, etc, can be

connected to the DL50

using the SCART-to-Phono

lead supplied.

Amplifier location

The amplifier should be sited

as close as possible to the equipment

to which it is connected. Due

consideration should be given to

ensure any microphones you wish

to use have long enough leads to

reach the required sound source.

Planning the system

Careful planning of the induction loop system prior to installation is essential. Please refer

to the diagram below and the hints and tips section on the adjacent page to help avoid

poor performance and the need to re-position the amplifier or loop cable at a later stage.

A typical DL50 domestic loop system

Detailed connection

diagrams and system set-up

information can be found

later on in this manual.

Approved Document No. DAU0000050 Rev 2•Page 9

When testing the installation, you may

hear a slight ‘humming’ noise in the

background, especially if using an

induction loop test receiver. This IS NOT a

fault with the induction loop system but a

common occurrence caused by mains

wiring. This hum will normally NOT be

heard by hearing aid users as most modern

hearing aids are equipped with built-in

filters which cancel this noise out.

Check that the loop strength meter

is not permanently lit red. The meter is

designed to light progressively from

1 to 3 (green to yellow to red) in line

with the loop signal strength. If it is

continually lit red, the signal will be

distorted and the amplifier may overheat.

If necessary, re-adjust the loop signal

control accordingly and re-test the sound

quality following steps 4 and 5.

Important note

Adjust the tone control to suit the user.

Turning the control clockwise usually

improves speech intelligibility and makes

the sound more ‘natural’. Turning it anti-

clockwise makes the sound ‘warmer’.

Large turns in either direction may lead to

you having to adjust the loop signal control

accordingly (see step 4).

TIP: If the user is not present, plugging a set

of headphones into the amplifer’s socket

will indicate the effect of any adjustments.

If two microphones are used, more

emphasis can be given to one over the

other by turning the amplifier’s

microphone priority control clockwise or

anti-clockwise to suit. When the control is

in the centre position (its default setting),

equal emphasis is given to both

microphones.

Approved Document No. DAU0000050 Rev 2•Page 5

Maximum area coverage

The maximum coverage provided by the loop system is 50m2(i.e. a room up to 7 x 7 metres

in size). Longer rooms can be covered provided width x length measurements do not exceed

50 metres.

Trial loops

Always run a trial loop and test to evaluate performance by listening to the signal with

either a hearing aid or a dedicated loop test receiver, such as SigNET’s RxTI (loop testing

equipment can be ordered using the ancillary order form attached). Refer to our dedicated

‘system set-up and testing’ section on pages 8 and 9 for further details.

Audio sources without output sockets

Some older televisions and other audiovisual appliances may not have a suitable output

socket for direct connection to the loop amplifier. NEVER attempt to make your own

connections by opening the appliance as high voltages WILL be present. Instead, place a

microphone next to the audio source in question.

Ventilation

The amplifier can become quite warm during normal operation so the airflow around it

must not be restricted. Ensure that the four rubber feet supplied in the accessory pack are

attached to the bottom of the unit as shown on page 7.

The ‘isolation’ issue

When a hearing aid user switches his or her hearing aid to the ‘T’ position, its on-board

microphone is switched off and the only noise that can be heard is the loop signal. If an

induction loop amplifier is connected to just one sound source, such as a television, some

hearing aid users (but not all) have said the lack of background noise makes them feel

isolated. This issue can be overcome by positioning a microphone where it will convey

background noise and pick up general conversation. (A maximum of two microphones can

be connected to the DL50, one is supplied as standard, if you require another you can order

one using the ancillary order form attached).

Overspill and ‘cross-talk’

The signal generated by the loop will radiate outside as well as inside the loop. If there are

any other loop systems in close proximity, overspill such as this may lead to ‘cross-talk’

(signals from different loops merging into one). Although not usually a problem in

domestic applications, special designs of loop can be implemented to help reduce the

overspill field. In the unlikely event of you encountering such problems, contact your

vendor for assistance.

Hints & tips

Approved Document No. DAU0000050 Rev 2•Page 8

With all system connections in place (see

pages 6 & 7), apply power to the amplifier

and check its green ‘power on’ indicator is lit.

System set-up and testing

Always run a trial loop to ensure correct operation. Only when you are happy with the

sound quality should you permanently fix the loop using tape, cable clips or a staple gun.

Turn on the system’s audio input source

(usually a television and/or a microphone)

and ensure it is producing an audio signal.

Note, SCART outputs have a fixed level signal

and altering the TV’s volume control will not

affect this.

3Using the flat-headed screwdriver

supplied, turn the amplifier’s input signal

level control clockwise until its input signal

indicator begins to flicker. This flickering

is associated with peaks in the audio

signal - if permanently lit, the signal will be

distorted. Re-adjust the control accordingly.

Set the loop field

strength by turning the

loop signal control in small

increments. After each slight

adjustment, check the audio

signal using a hearing aid or

induction loop test receiver

whilst standing in the centre

of the loop/room. Repeat

until an acceptable signal

level is received.

5When you are satisfied with the signal

in the centre of the loop, move around the

room to ensure coverage is consistent

throughout. Pay particular attention to areas

where the hearing aid user is likely to sit.

Next, if possible with the hearing aid user

in position, set the amplifier’s tone and

microphone controls to suit their personal

preference following steps 6 and 7.

Approved Document No. DAU0000050 Rev 1 •Page 6 Approved Document No. DAU0000050 Rev 1 •Page 7

Safety precautions

Connecting the phono inputs

Connection to most televisions, DVD

players, etc, can be made using the

SCART-to-Phono lead supplied:-

Connecting the microphone input(s)

One microphone is supplied with the DL50.

This should be connected to the rear of the

amplifier as shown below:-

Ensure that the amplifier IS NOT located in areas with poor ventilation, high ambient

temperatures or high humidity. It SHOULD NOT be exposed to direct sunlight, high dust

levels or be placed next to vibrating or heat-generating equipment.

The 230Vd.c. to 12V a.c. plug-top power supply (supplied) is designed for use with the

DL50 amplifier ONLY. DO NOT use any other plug-top power supply with the DL50 and

DO NOT plug the lead into any other electrical appliances as this may cause irreparable

damage. Replacement PSUs, if required, can be ordered using the ancillary order form

attached.

DO NOT dismantle or attempt to modify the amplifier or its plug-top power supply. No

user-serviceable fuses or parts are included. For repair, consult your vendor.

Ensure the plug-top power supply’s lead, the loop cable and all relevant audio/microphone

lead(s) are fixed securely into position before operation. Do not leave any trailing leads.

For added protection, during thunderstorms or when the amplifier is to be left

unattended for prolonged periods of time, unplug the plug-top power supply from the

wall outlet.

Connecting the unit

Please refer to the safety precautions below before attempting to

make any connections or operating your DL50 loop amplifier.

An optional Phono-to-Phono

lead is available for use with

certain types of satellite and

cable TV boxes - refer to the

ancillary order form attached.

Connecting the plug-top power supply

The plug-top power supply should be

connected to a 230V d.c. wall socket and

the 12V a.c input on the rear of the amplifier:-

Connecting the loop cable

Both ends of the loop cable should be

connected to the amplifier’s loop cable

push-and-hold terminals as shown below.

Attaching the cabinet feet

The four self-adhesive rubber feet provided

in the DL50’s accessory pack should be stuck

to the underside of the amplifier as shown.

Connecting the alert input

The alert input is designed for use by specialist installers, i.e. qualified electricians, only.

When triggered (by a normally open volt-free switch across its connectors) it causes a pulsed

alert tone in the loop. This can be used to warn the user that a doorbell has rung or a fire

alarm has sounded. DO NOT attempt to use this input unless you are qualified to do so.

In domestic applications, alerting the user to a ringing doorbell, etc, can be achieved much

more easily by placing a microphone in a strategic position in the room.

Connect the loop cable by pushing one of

its prepared ends into the left terminal

and the other into the right terminal.

The push-and-hold connectors will

automatically grip the ends. Any excess

cable should be neatly tied up and placed

where it cannot be tripped over. If you

need to remove the cable at any time, you

must first insert a terminal screwdriver

into the rectangular hole

directly below the

cable insertion hole

(see right). This will

open the insertion hole

and allow the cable to

be removed.

If required, an

additional microphone

can be connected to

the amplifier’s second

microphone

socket -

refer to the ancillary

order form attached.

12V

Note: it does not

matter which phono

plug goes into which

socket

Only use the plug-top power supply supplied

with your DL50 kit. Note that there are no

user-servicable parts on this power supply

and in the event of failure you must

purchase a replacement lead. Refer to the

ancillary order form attached for details.

33m length of loop cable

(Note that the adhesive can

take some time to set and

therefore the amplifier should

be handled with care until it is

located in its final position).

12V

Only use the

loop cable

supplied with

your DL50/K

kit

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