City Councils Hearing Loop Systems

3 Monkeys Audiovisual can design, install and commission your induction loop system. This may be a simple perimeter loop or single array or may require a more complex design such as a low loss or cancellation loop. Whether simple or complex, an experienced designer and installer should always be engaged to ensure you achieve the best possible result within your City Council or Shire.

How do induction loops work?

An induction loop system transmits an audio signal directly into a hearing aid via a magnetic field, greatly reducing background noise, competing sounds, reverberation and other acoustic distortions that reduce clarity of sound.

Audio Inputs 1, either from an existing audio source such as a P.A. system or from dedicated microphone inputs feed an audio signal into an Induction Loop Amplifier 2. The amplifier drives a current into a Loop 3 or series of loops. As the current flows through the cable it creates a Magnetic Field 4 in the required area – careful loop and amplifier design ensures that the vertical component of the field is even and free of dropouts and dead zones wherever the user might be. Inside most Hearing Aids 5, a small coil known as a Telecoil 6 picks up the magnetic field signal, which is amplified into a high quality audio signal delivered directly to the ear of the hearing aid user.

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Most hearing aid users would say that when they use their aids in one to one conversations they work very well. Difficulties arise when the level of ambient noise is too great or the distance between the talker and listener is increased as in a meeting chamber or courtroom. The problems are exacerbated if the assistive listening system in use has been poorly specified or installed, particularly…

  • when there are large and complex room structures
  • when multipurpose rooms are in use e.g. partitioned meeting rooms
  • where overspill can cause interference or broadcast of the signal
  • when metal is present in the building structure or room contents

Ampetronic™ hearing loops:

  • offer direct communication to users via their existing hearing aid without the need for additional receivers
  • match the commitment of the user and offer a genuine benefit making their participation more inclusive and effective
  • reduce overspill and so reduce interference or the possibility of broadcasting of sensitive information

In addition they…

  • allow freedom of movement by ensuring a consistent signal throughout the looped area
  • minimise the effects of metal in the structure
  • can be integrated into new builds or retro-fit into existing structures


  • Communicate directly with hearing aid users
  • Support inclusion and enable participation
  • Minimise uncontrolled information sharing
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