Ampetronic W5-2 Instruction Manual

W5-2
Installation Handbook
& Maintenance Manual
www.ampetronic.com
Listen to the difference
For full operating and maintenance instructions, plus
design templates and other associated information
please visit www.ampetronic.com/w52

Handbook Contents
• Safety
• Introduction
• Block Diagram
• Overview
• Connections, Controls & Indication
• Installation
• Connection & Set-up
• Troubleshooting
• Operating Instructions
• Technical Specications
• Warranty
• Declaration of Conformity
• Maintenance Manual
Box Contents
• 1 x W5-2
• 1 x PSU + mains lead
• 4 x Self-adhesive feet
• 2 x 3.5mm 3 way terminal blocks
• 1 x 3.5mm 2 way terminal block
• 4 x 5mm 2 way terminal blocks
• 1 x Loop logo
Optional Accessories
• W5-2 cable tray & xings
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual Page 1
This symbol is used to alert the user to important operating or maintenance instructions.
The Lightning bolt triangle is used to alert the user to the risk of electric shock.
SAFETY
1. It is important to read these instructions, and to follow them.
2. Keep this handbook in an accessible place.
3. Clean only with a dry cloth. Cleaning uids may a󰀨ect the equipment.
4. The amplier generates some heat during normal operation and needs adequate ventilation.
Do not install in a fully enclosed space.
5. Do not install this equipment near any heat sources such as radiators, heating vents or other
apparatus that produces heat.
6. Refer all servicing to qualied personnel. Servicing is required when the apparatus has been
damaged in any way, such as a power supply cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the apparatus has been exposed to any rain or moisture, does
not operate normally or has been dropped.
7. WARNING – To reduce the risk of re or electric shock, do not expose this apparatus to rain or
moisture. The apparatus shall not be exposed to dripping or splashing and no objects lled
with liquids, such as vases, shall be placed on the apparatus.

Page 2
Introduction
The W5-2 professional induction loop driver has been engineered for special loop design processes
and cost-e󰀩cient considerations, allowing for the delivery of high-quality, low-spill hearing loop
performance in compact spaces.
Designed for straightforward and discreet wall-mounted installations, it o󰀨ers a practical solution for
improving audio accessibility within conned environments.
Verication of the correct operation of the W5-2 induction loop driver is essential for each
installation, and adjustments may be required to achieve compliance with the IEC 60118-4
Standard.
The W5-2 induction loop driver has been designed with ease of installation and use in mind.
The W5-2 operates as a Class D amplier, ensuring increased e󰀩ciency and lower power
consumption. Additionally, it features Euroblock screw terminal connections, enhancing the
practicality of the installation.
BLOCK DIAGRAM
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual
A
INPUT 1
INPUT 2
100V
AGC MLC Loop
Inductance Control Phase shier
PA amp
Channel A
Channel B
DC power input
Status
DC outputPower
converter
INPUT
Overload
Acve
LOW – MED - HIGH
TEST SIGNAL
OFF – FIELD - FREQ
STATUS
Fault
Power good
CHA
Clipping
Current
Clipping
Current
CHB

243mm
267mm
12mm
100V INPUT 1 INPUT 2 MLC CHA CHB
W5-2 MULTILOOP DRIVER
INPUT CHA CHB STATUS
147mm
50mm42mm
1
1. KEYHOLE MOUNTING HOLES: 15mm x 4
2. M4 screws and washers (provided) securing cable tray to main unit
3. M4 stud (nut and washers provided) for grounding if required
4. Suggested mounting position for PSU
5. Knock out positions for 20mm ttings/grommets (not supplied)
6. Alternative cable entry under ‘ap’
Wall Mounting Dimensions
Page 3
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual
3
22
565
55
4

1. Cable Tray Securing Points
2. 100V Input: Attenuated input for 100V line
signals.
3. Phantom Switch: Applies 24V phantom
power to both inputs.
4. Mic/Line Switches: Push switches to set
signal level of input 1 & 2.
5. Inputs: Balanced mic or line inputs.
6. DC Output: 2 pin connector supplying 24V for
ancillary units.
7. Test signals: Switch to enable test tone
output.
8. Loop Inductance Switch: Adjusts frequency
response according to load inductance.
9. Status: 2 pin normally closed relay contacts.
Opens to reect fault conditions.
10. DC Power: Socket for connecting the
provided PSU only.
11. Looop Outputs: 2 pin connectors for loop
feed cable.
CONNECTIONS
Serial N o
MIC LINE
+-
INPUT 1
MIC / LINE
MIC LINE
+-
INPUT 2
MIC / LINE
OFF
ON
PHANTOM
Induction Loop Driver
www.ampetronic.com
Designed in the UK, made in India
++ -
TEST SIGNAL
OFF
FIELD
FREQ
W5-2
LOOPOUTPUT B
LOOP IND STATUS
DC POWER
LOOPOUTPUT A
LOW
MEDIUM
HIGH
+
100V INPUT
+-
24V
1.3A
24VDC OUT
0.1A
267mm
42mm
1
2
3 5 4
4 6 5
7 8
9
10
11 11
1
100V
W5-2 MULTILOOP DRIVER
INPUT CHA CHB STATUS
CONTROLS & INDICATION
1. 100V Gain: Level control.
2. Input 1 & 2 Gain: Level control.
3. Input Indicator: Indicates input signal in AGC
(green) or overload (red).
4. Loop Output Current Indicators: Indicates
current (green) and clipping (red).
5. Status Indicator: Indicates power (green) or
fault (red).
6. Metal Loss Control: Level control.
7. Loop Output Current Control: Level control.
1 2
4
7
3 5
MLC CHA CHBINPUT 1 INPUT 2
6
Page 4 Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual

INSTALLATION
Tools
A magnetic eld strength meter (e.g. Ampetronic FSM or Loopworks R1) is vital to check that the
loop system is providing the desired level of performance.
A small at bladed screwdriver is necessary to adjust the controls and secure cables into the screw
terminals.
A PH2 driver is required to open and close the lid
Location
The unit is designed for wall or panel installation, with a detachable lid which is secured by four
Phillips No 2 screws. The unit may also be used free standing.
The location must provide adequate ventilation for the unit. If the unit is installed in an
enclosed environment, su󰀩cient airow into the enclosure must be provided through vents,
fans or other means.
Contact Ampetronic for advice on cooling requirements for your installation.
Once the location is decided remove the lid by unscrewing the 4 securing screws. Use the base
section to mark the wall for drilling.
If supplied from the building mains supply without a disconnect device the W5-2 is classed
as a permanently connected apparatus and as such shall be installed in accordance with
relevant building and wiring regulations.
CONNECTION & SET-UP
It is advised that the loop system is initially set up using a local audio source such as a CD player,
which is not connected into any other system. This avoids the complication of ground loops and
feedback etc, whilst the unit is set up.
The following procedure assumes cables have already been installed to the site where
the unit will be mounted and that the AC power feed is isolated.
1. Ensure a suitable loop layout has been installed. See https://www.ampetronic.com/w52 to
download pre-prepared designs for small rooms. If these are unsuitable for your space use
Loopworks Design or contact Ampetronic support for a bespoke design.
2. Run a twisted pair feed cable between the termination point of each loop circuit and the
intended driver location.
3. Install suitable microphones as required and run audio input cables from all sources to the
intended driver location.
4. If using cable tray knock out required cable entry points and t suitable grommets or glands.
5. Mount the unit in its intended position and ret the lid.
6. Turn all controls fully anti-clockwise.
7. Connect the loop feed cables into the provided 2 pin 5mm terminal blocks and insert into the
loop outputs.
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual Page 5

8. Connect the signal inputs appropriately:
Microphones (balanced only): Suitable dynamic or condenser microphones. Select
phantom power as required. Connect to the provided 3 pin 3.5mm terminal blocks and
insert into INPUTS 1 & 2 (with mic/line selector switch in the mic. position) see Connections
drawing.
Line Input Sources: For feeds from PA or AV systems and other line level signal sources.
Ensure a mono summed, balanced connection is available. This may require the use of a 3rd
party adapter such as a direct box. Make sure phantom power is turned o󰀨. Connect to the
provided 3 pin 3.5mm terminal blocks and insert into INPUTS 1 & 2 (with mic/line selector
switch in the line position) see Connections drawing.
100V line: Connect to the provided 2 pin 5mm terminal block and connect to 100V
Input (see Connections drawing). This input may have a hazardous voltage on its
terminals and must only be connected by a suitably qualied person.
9. Connect the provided DC PSU to the DC input (see Connections drawing) and the
mains plug into a suitable outlet.
Ensure all relevant tests of AC supply have been carried out before turning supply on.
10. Turn on AC power feed. The STATUS LED will illuminate green. If the LED fails to illuminate
consult the Troubleshooting section.
11. Set the Loop Ind switch to the right position for the amount of cable used in your loop
installation. Refer to details in Technical Specications or on design documentation.
12.Set the Test Signal switch to the middle “Field” position. Turn the CHA and CHB output
current controls clockwise until the CHA and CHB output current indicators light up green.
13.The loop system should now be providing a magnetic eld inside the area of the loop. Use
a Field Strength Meter or Loopworks R1 to measure signal levels. Field strength should
achieve 0dB +/-3dB re. 400mA/m in all intended listening positions.
Adjust the CHA and CHB controls until this performance is achieved. In most cases the two
output channels should be set to the same level.
Once the correct eld strength level is achieved the CHA and CHB controls should NOT need
re-adjusting.
14.Set the Test Signal switch to the right “Freq” position. The driver will now be outputting 3
sinewaves simultaneously at 100Hz, 1kHz and 5kHz in order to measure the frequency
response of the system.
With a Field Strength Meter adjust the receiver height until 0dB is measured in the 1kHz
setting, then check the signal level at 100Hz and 5kHz, these should both be within +/-3dB
of the 1kHz level. If 5kHz is too low turn the MLC control clockwise until a at frequency
response is achieved, making sure that the 100Hz level does not drop below -3dB.
15.If not already done so, steps can now be taken to integrate the W5-2 into a PA / mixer
arrangement following standard audio techniques. If any unusual e󰀨ects are experienced
refer to the Troubleshooting section.
NOTE: Ideally, each input signal level should be set to just illuminate the AGC LED with the
quietest level of input likely to be used. This will maximise the dynamic range of the system
and ensure satisfactory performance.
16.Repeat the above procedure for each input used. When adjusting each input, make sure the
signals are removed from the other inputs. This ensures that all signals are set to equivalent
loudness and drive the AGC properly.
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance ManualPage 6

TROUBLESHOOTING
STATUS LED not illuminated
Check the provided PSU is correctly attached to the unit.
Check its mains cord is correctly attached and in good condition.
Check the mains cord is plugged into a suitable outlet and that it is turned on.
Check the provided PSU is providing power. This can be checked with a multimeter in Volts DC
mode on the barrel connector of the PSU, centre positive. 24V dc should be seen.
STATUS LED illuminated RED
Check loop cables are connected and terminated correctly.
The unit could be overheating (which will also result in reduced or no current). Reduce the current
or turn o󰀨 and allow to cool. Ensure that the unit is installed in a location with su󰀩cient ventilation.
Check load is correctly rated for the unit.
Turn power o󰀨 and on again – in extreme circumstances the PA amplier can latch in a fault
condition leaving the STATUS LED illuminated Red. In this case no current will be delivered.
INPUT LED not illuminating
Check input connections.
Check TEST SIGNAL switch is O󰀨.
Ensure the appropriate control (INPUT 1, INPUT 2, 100V) is turned up. Check there is su󰀩cient
signal level for the required input.
Check MIC/line switches are in the correct position.
INPUT LED illuminating RED
Check input signal level is appropriate for the input used.
Check MIC/line switches are in the correct position.
Adjust the appropriate control (INPUT 1, INPUT 2, 100V) to reduce the input level.
CHA or CHB LED not Illuminating
Check the INPUT LED is illuminating.
Check the CHA or CHB controls are turned up su󰀩ciently.
Ensure the STATUS LED is illuminated green.
Check loop cables are connected and terminated correctly.
Check the loops are not open circuit, short circuit or connected to earth (see instability or high
frequency noise section of Troubleshooting).
The unit could be overheating (which will also result in reduced or no current). Reduce the current
or turn o󰀨 and allow to cool. Ensure that the unit is installed in a location with su󰀩cient ventilation.
CHA or CHB LED Illuminating RED
Check loop cables is connected and terminated correctly.
Check the loops are not open circuit or connected to earth (see instability or high frequency noise
section of Troubleshooting).
Check loop inductance is within spec.
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual Page 7

Low magnetic field strength
Due to insu󰀩cient current or excessive metal loss. Turn up CHA and CHB controls if possible. If
these are already turned all the way up the loop layout may not be appropriate for the environment,
or the loop driver may be underpowered. Contact Ampetronic support for advice.
Instability or high frequency noise
1. It is possible for the loop cable to be grounded under fault conditions, resulting in instability
which may sound like high frequency noise, buzz or whistling.
This fault is easy to determine. Simply disconnect the loop cable from the amplier and test
with a resistance meter between either of the loop wires and a good earth point such as a metal
radiator. The meter should show no connection or greater than 10 megaohms. Any lower reading
indicates a failure of the loop cable insulation and you will need to either repair or replace the
loop cable.
2. Instability can be caused by using poor quality signal cables, long unbalanced (2-wire)
signal runs to the inputs, or by running input cables in close proximity with the loop wire over
an appreciable distance. Loop ampliers are capable of delivering high currents at audio
frequencies. If the loop cable is run close to sensitive signal cables it may be possible to induce
a signal back into the input of the amplier causing feedback. Cable runs and loop wires should
be kept well apart from each other. To avoid interference maintain a separation of at least
300mm.
3. Instability can cause the amplier to run hot and may result in an overheat condition (see CHA
or CHB LED not illuminating section).
Interference
1. Background magnetic eld signals or interference may be present in any location and may
not be anything to do with the loop system. Monitor this with a loop receiver (such as an ILR3,
ILR3+ or Field strength meter). If the interference is still present with the loop system switched
o󰀨, then you need to locate and eliminate the source of the interference before switching the
loop system back on.
2. Magnetic elds can induce currents into any low impedance electrical path or loop. Audio or
video systems with multiple earths may experience pick up of the loop signal. Check entire
sound system for evidence of loop signal, and trace source of pick up.
3. Under certain circumstances, the loop signal may appear as jagged lines or hum bars on a
CCTV picture. This could be due to running CCTV (low impedance unbalanced 2-wire circuit)
cables in close proximity to the loop cable. Separate the loop cables to reduce the e󰀨ect.
4. Remote (and apparently unconnected) PA systems can sometimes pick up loop signals. This is
usually because the loop cable becomes damaged (see point 1 of Instability) or induces signals
into the remote system through long unbalanced cables. Always run long audio signal cables as
3-wire balanced circuits and keep away from loop cables.
ACCESSORIES
Details of all products and services provided by Ampetronic can be found at www.ampetronic.com.
OPERATION INSTRUCTIONS
The W5-2 unit can be left connected and powered on indenitely. It should not require post
commissioning adjustment of the controls during normal operation.
A visual check of the status LEDs can be performed to ensure that the unit is powered up and has
an input signal.
Periodic system testing can be performed using the Maintenance Manual contained in this
Handbook to ensure the amplier and loop are functioning correctly.
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual
Page 8

Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual
TECHNICAL SPECIFICATIONS
INPUTS & SIGNAL PROCESSING MIC Line UNITS
Input gures quoted at maximum front panel gain control setting.
INPUT 1 & 2: (mic/Line) 3 way, 3.5mm phoenix, balanced, suitable for up to
600Ohm microphones or line level.
Input impedance
Sensitivity
Overload
8,700
-69
-33
8,700
-45
-9
Ω
dBu
dBu
100V: Isolated 100V line input
Input impedance
Sensitivity
Overload
120,000
+11
+47
Ω
dBu
dBu
AGC: Compression of signal indicated by green INPUT LED when active
and RED when overloaded.
Input range
Output range
Min. input level for AGC
Attack time
Decay time
>36
±1
See sensitivity
3.5
1.4
dB
dB
ms
s
METAL LOSS CORRECTION: Specially designed adjustable lter to
compensate for the e󰀨ects of metal loss. Gain @ 1kHz remains constant.
Min. slope
Max. slope
0
+3
dB/oct.
dB/oct.
LOOP IND: High shelf lter options to compensate for the e󰀨ect of loop
inductance on the class D output stage
Low
Med
High
No e󰀨ect
3dB max starting from ~1kHz
4.8dB max starting from ~1kHz
Test Signals: Internally generated signals for commissioning which when
activated interrupt the input audio signal.
O󰀨
Field
Freq
Audio signal passed
Single 1k tone
Combined 100, 1k & 5k sine tones
Hz
Hz
DC Power
Power gures for reference only. With unit set for maximum output with the
input in AGC. Only use the provided DC power supply.
Voltage
Current idle
Current pink noise
Current sine
24
0.28
1.3
3.2
V
A
A
A
Page 9

TECHNICAL SPECIFICATIONS
OUTPUTS UNITS
LOOP OUTPUT: 2x 2way, 5mm, phoenix.
Voltage
Current
Continuous pink noise
THD +N (1kHz, sine, max output)
Maximum loop resistance
Frequency response
7.8
5
2.5
0.5
0.6 (at maximum current)
±3dB, 100 to 5000Hz
VRMS
ARMS
ARMS
%
Ω
DC OUT: 2 way, 3.5mm, Phoenix. Fuse protected output for ancillary
devices.
Voltage
Current
24
0.1
V
A
Status: 2 way, 5mm, Phoenix. Volt free relay contacts indicating fault
condition when open.
Contact rating
(resistive load)
12A, 125Vac
10A, 250Vac
10A, 30Vdc
PROTECTION FEATURES UNITS
Thermal Protection: If the PA amplier reaches a pre-determined level the
output current will be gradually attenuated followed by shutdown.
Output attenuation
Unit shutdown.
(Requires power cycle to recover)
Max -4dB @ 90
PA chip junction temp>155 °C
°C
°C
DC input over-current
Output attenuation Max 4dB >5A dc input
Output over-current
Unit shutdown.
(Requires power cycle to recover)
>10A loop current
PHYSICAL CHARACTERISTICS UNITS
Dimensions: Width
Height
Depth
Weight
Operating temperature
Ingress protection rating
270
152
42
1.1
-10 to 40
30
mm
mm
mm
kg
°C
IP
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual
Page 10

WARRANTY
This product carries a ve year parts and labour warranty from date of shipment from Ampetronic.
To qualify for the ve year warranty, the product must be registered at
www.ampetronic.com (products/warranty), without which the warranty will be valid for two years
only.
The warranty could be invalidated if the instructions in this handbook are not followed correctly, or if
the unit is misused in any way.
DECLARATION OF CONFORMITY
Manufacturer: Ampetronic Ltd.
Unit 2, Trentside Business Village
Farndon Road
Newark
NG24 4XB
Declares that the product:
Description:Induction Loop Driver
Type name:W5-2
Conforms to the following Directive(s) and Norm(s):
Directive 2014/30/EU
EMC: EN 55032:2015 Emission
EN 55035:2017 Immunity
Directive 2014/35/EU
Safety: EN 62368-1:2020
Directive 2011/65/EU RoHS
Date: November 2023
J.R. Pieters
Managing Director
Ampetronic Ltd
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual Page 11

MAINTENANCE MANUAL
Overview
1. This procedure is for checking an induction loop systems (otherwise known as a hearing loop,
T-loop or ‘AFILS’) performance against the IEC 60118-4: 2006 Standard.
2. The procedure takes into account how the system is actually used. You will need access to the
induction loop amplier to conduct the tests.
3. To use this procedure the loop amplier must have an indicator which shows when the
Automatic Gain Control (AGC) is activated. This indicator may be labelled as ‘AGC’,
‘Compression’, ‘In’ or ‘Input’ on the amplier. Most ampliers have this feature.
4. You will need to follow all the steps detailed to properly to check the system.
5. In the event that any step of the process shows a problem, and you are not able to resolve the
problem as instructed, the issue should be reported for further action.
Equipment required
You will require:
• A eld strength meter (FSM), Loopworks R1 or professional audio analyser that reads 0dB at
400mA/m eld strength, and headphones to listen to the loop system.
• If adjusting the controls, a small Phillips screwdriver and a small terminal screwdriver / trim
tool.
NOTE: If the installed audio inputs are not available to be used, you cannot complete the test
BUT you will be able to identify most problems using the integrated test signals.
Product Installation - Visual Inspection
1. The unit must be securely mounted in a location not susceptible to water ingress or
excessive dust/dirt.
2. The installed unit should not have any sign of physical damage
3. The following connections should be present and correctly terminated at BOTH ends of
the connection (where this can be inspected):
• 24V DC POWER
• LOOP OUTPUT A and B (feed cable to loop)
• Installed audio inputs connected to INPUT 1, 2 or 100V. At least one connection
required.
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual
Page 12

Environmental Magnetic Noise Check
1. Use a Ampetronic FSM Field Strength Meter or Loopworks R1, held vertically at about 1.2m
above oor level for seated positions or 1.7m for standing positions above oor level, in the
centre of the looped area. Ensure the loop driver is powered off. The Field Strength Meter should
be set to ‘background noise’ mode.
2. Check that the reading is not above -22 dBA on the FSM, ideally below -32 dBA. It may
occasionally be higher for a very short time, typically during a nearby tram movement, but in the
‘Listening Check’ (later) this must not impair intelligibility of the loop signal.
Basic Functionality
1. Apply power to the unit.
2. Initially, the STATUS and INPUT lights should be lit.
• The CHA and CHB light should not be lit after a very short time.
• The STATUS light should remain illuminated at all times.
• The INPUT light will fade and go out after about 20 seconds if there is no audio input active.
3. Activate normal audio signals, this may be someone speaking into a microphone or playback of
program audio.
• If this is not possible, set the Test Signal switch to the middle “Field” position.
4. When the audio input signal is active, check:
• The AGC light is lit, and the CHA and CHB light is lit on peaks of signal (may only be
occasionally lit)
Magnetic Field Strength Check
1. Identify the area of enclosed by the loop
• Refer to steps 12 - 14 of the Connection and Set-Up section of the handbook.
Ampetronic W5-2 Hearing Loop Driver Installation Handbook & Maintenance Manual Page 13

Contents Copyright © Ampetronic Ltd 2024. All rights reserved.
www.ampetronic.com
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