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What are induction loops ?


Induction loops, (or Audio Frequency Induction Loop Systems - AFILS) 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 induction loops. The hearing aid converts this signal into a sound suited to its user's specific hearing requirements.

Any person with a hearing aid positioned within or near the induction loops can hear the loop signal by switching their hearing aid to the correct position, allowing them to participate more effectively in general conversation, ordering goods or services, listening to public performances, etc.

An induction loop system therefore comprises the following main elements:-

  • The audio source - typically a microphone, television or radio (or a combination of these).
  • The induction loop amplifier
  • The loop - typically a single turn of wire usually run around the perimeter of the room or special counter loop fixed to the underside of a table.
  • The receiver(s) - any hearing aid with a 'T' or 'MT' switch or a specially designed loop listening device.

In addition to the many routine benefits for hearing aid users, induction loop systems can also be used for other limited area broadcasting applications such as museum 'walk through' guided tours and surveillance talkback systems.


Induction Loop Amplifiers


PDA Pro Range 200-900 Loop Amplifiers

the new range of professional audio-frequency induction loop amplifiers offer outstanding sound quality at a competitive price. Each amplifier features one balanced microphone input and one switchable balanced mic. or line level input, both of which will accept standard 3 pin XLR connectors

Ideal for theatres, cinemas, churches, conference halls and other applications where top quality sound is a must.

  • Two XLR 3 pin input sockets - one balanced mic. and one switchable balanced mic./line
  • Optional 11V phantom power available for electret or condenser microphones
  • 'Outreach' input allows the connection of up to 10 additional mic. or line level inputs via a series of separately available single gang connector plates
  • Adjustable level controls provided for all inputs - can be used individually or together as a three-input mixer
  • Adjustable drive control allows the loop current to be adjusted to suit a room's individual characteristics
  • Metal compensation control helps offset the frequency response problems associated with excessive metal in a building
  • True output current meter
  • Visible indication of the amplifier's compressor action via two LEDs
  • 3.5mm headphone socket allows true monitoring of the output signal
  • Advanced audio signal processing with automatic gain control
  • On-board cooling fan on PDA500/2 and PDA1000/2 promotes stable operating temperature and increased reliability

Pro Loops Brochure >>



PDA200E 120mē Induction Loop Kit


The PDA200E is unlike any other induction loop amplifier. Its straightforward internal screw connectors and easy to adjust controls mean no specialist audi experience or audio connectors are required.

By following its simple set-up procedure, only a handfull of adjustments are necessary, allowing a top quality assistive listening system to be set-up in its entirety by any competent electrician.

For ease of specification and installation, the PDA200E is available either on its own or in a variety of cost-effective AK RANGE kit which are suitable for use in meeting rooms, lecture theatres, hotels, churches, schools, shops, nursing homes etc.

  • Provides max. square room coverage of 120mē (11m x 11m) or max. rectangular room coverage of 250mē (10m x 25m)
  • Straightforward internal screw connectors
  • Wall-mounting metal enclosure for permanent installation
  • Internal tamper-resistant drive, level and tone controls
  • One balanced/unbalanced microphone input
  • One balanced/unbalanced line level input (for TVs, CD players, etc)
  • Alert tone switch input for doorbells, fire alarms, security systems, etc
  • 100V line input for PA system connection
  • External loop drive current and power on LED indicators
  • Optional 'outreach plate' input extension system allows a greater variety of inputs to suit virtually any application
  • Helps satisfy the requirements of the Disability Discrimination Act, BS8300 and the Care Standards Act
  • Compliant with AFILS standards BS7594 and EN60118-4
  • Ideal for meeting rooms, lecture theatres, shops, churches, schools, shops, TV Lounges and other small to medium sized applicatins
PDA 200E Brochure >>



PDA102 1.2mē to 50mē Induction Loop Amplifier

The PDA101 mini-audio frequency induction loop amplifier is ideal for any application requiring restricted or small area coverage. It includes two mixed microphone or line level inputs for the connection of desktop microphones, CD players, TV SCART leads, etc, and comes in a variety of cost-effective kit formats to aid specification and installation.

The amplifier's inputs can be easily adjusted for optimum performance using its two level controls and an adjustable drive control allows its output stage to be set up to suit the exact requirements of any room.

The amplifier is designed to be free-standing or wall-mounted using the keyholes provided with installation further aided by its input peak, output current and power on LEDs.

  • Ideal for ticket counters, desktops, TV lounges, interview rooms, etc.
  • Provides max. square room coverage of 49m2 (7m x 7m) or max. rectangular room coverage of 100m2 (5m x 20m).
  • Two unbalanced microphone or line level inputs
  • Optional phantom power for electret microphones
  • Input peak, output current, signal present and power on LEDs
  • Automatic compressor-limiter
  • 'Soft start' facility
  • Adjustable drive and input level controls
  • Free-standing or wall-mountable
  • Compliant with AFILS standards EN60118-4 (formerly BS6083) and BS7594 993)
PDA 102 Brochure >>



PL1/K Counter Induction Loop Kit

Over 10% of the population suffer from hearing impairment. Under the Disability Discrimination Act, anyone offering goods facilities or services to the general public must make 'reasonable' adjustments to ensure they do not discriminate against such people. One of the easiest ways to meet this requirement is to have a portable induction loop system available and ready for use at all times.

Attractively designed in tough ABS plastic, The PL1/K1 portable induction loop system is a truly portable and extremely durable audio frequency induction loop system, packed full of features and available at a very competitive price.
  
  • Fully compliant with BS7594 and EN60118-4, it is ideal for use in schools, shops, nursing homes, leisure centres, hotels, banks, GP surgeries, reception desks and many other private, public and civic applications.
  • Ready for use within seconds
  • Free-standing lightweight design - ideal for counter, table or desktop use
  • Simple one button operation
  • Generates a loop listening field of approximately 1.2m2
  • Excellent sound quality
  • Integral high performance microphone accommodates different operator voice levels
  • Plug-top charger included in all kits (amplifier charges fully overnight)
  • Five years expected battery life under normal operating/charging conditions
  • Integral cut-off timer (settable to 10, 30 or 60 minutes) helps prevent inadvertent battery discharge
  • Remote microphone socket for optional tie/desk microphone
  • Indicators provided for power on, input level, charging required and charging in progress
  • Available in durable plastic storage /carry cases - see overleaf for full PL1 Range parts listing

PL1 Brochure >>



DL50/K Domestic Induction Loop Amplifier Kit


Our new DL50/K domestic loop amplifier kit includes everything you need to create a high quality induction loop system for a bedroom, living room, TV lounge or study.

Carefully designed to sit discreetly alongside all types of audio-visual equipment, the amplifier features one set of phono inputs (for direct connection to television sets, etc), two microphone inputs and an alert input (for connection to fire alarms, doorbells, etc).

Screwdriver-adjustable drive, level, mix and tone controls are provided, allowing the system to be tailored to suit the exact requirements of any room, with installation further aided by the provision of an output current meter, an input peak LED and an easy-to-follow installation guide



  • Ideal for bedrooms, living rooms, TV lounges, studies and other domestic applications
  • Kit includes a DL50 induction loop amplifier c/w plug-top power supply, 33m of loop cable, a SCART-to-double-phono audio connection lead and a microphone
  • Attractively-designed amplifier provides max. square room coverage of 50m2 (7m x 7m) or max. rectangular room coverage of up to 100m2 (5m x 20m)
  • Connections provided for two 3.5mm electret microphones (one mic. is provided in the DL50/K kit) and one
  • SCART-to-double-phono audio lead (alternative leads are available for purchase if required)
  • Simple to adjust, tamper-resistant drive, level, tone and mic. priority controls
  • Input peak, output current, signal present and power on LEDs
  • Alert tone input for doorbells, fire alarms, security systems, etc.
  • Automatic compressor limiter
  • Full 2Ω drive current capability for increased coverage at higher frequencies
  • Fully compliant with EN60118-4 (formerly BS6083) and BS7594:1993


DL50 Brochure >>


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