Induction loops

Induction loop amplifiers are a must for modern PA installations to give people with hearing disabilities equal access to information and announcements.

Adastra's induction loop equipment is designed to complement the A series mixer amplifiers with their multiple input options; allowing these induction loop amplifiers to be used stand alone, with up to three sound sources – no need for a separate mixer or mixer amplifier.

How it works

Induction loop amplifiers allow audio signals to be transmitted using a magnetic field to a suitably equipped listener. A magnetic field is created when current flows through a wire.

In induction loop systems the wire is normally installed as a loop around the perimeter of the area. A small coil within a hearing aid or other suitable receiver then picks up this magnetic field and converts it to audio at a suitable level for the listener.


The loop itself is simply an insulated wire installed at a low level, around a skirting board for example.

Induction loop signals

Hearing aids designed to receive induction loop signals generally have a switch marked 'M' for microphone and ‘T’ for telephone (sometimes a combined position is provided).

In the 'T' position a pickup coil, originally designed for picking signals from a telephone earpiece, and is used to receive audio from induction loop systems.

The ideal signal strength for an induction loop system is such that a person switching between 'M' and 'T' would not notice a difference between the sound of someone speaking normally and a signal transmitted from the loop. We also have available a simple inductive loop receiver that allows you to listen to the loop signal using an ordinary pair of headphones, which is ideal for installing and testing induction loop systems.

It is important that the cable used to form the loop is capable of carrying the current that the amplifier produces.

Typical applications:

Churches and places of worship

Conference rooms and theatres

Museums, galleries and exhibitions

You can get more sound advice and help at Peat Wholesale

Phone: +353-1-6264662

Email: info@peatswholesale.ie