Appropriate Loop Amplifier

Appropriate Loop Amplifier

Loop system guide for a public building to be DDA compliant or at home for people who are hearing impaired

How to calculate for the correct loop amplifier
First of all measure the room length and width and calculate in m2.  Each loop amplifier is rated in m2 for the area it will cover. You can then choose the correct size induction loop amplifier to suit the room size.  If the area of the room to be looped is close to the maximum area coverage of the chosen loop amplifier please then consider upgrading to the next size up loop amplifier.  You need to use an amplifier than will run with some in reserve for future expansion and in any event, it is good practice to keep an induction loop amplifier loaded between 80-95% for greater reliability.

Loop amplifier positioning
A typical set up of an induction loop system is to place the loop amplifier as close as possible to the sound source. The loop amplifier can mounted on a wall closest to the sound source - for example, close to the village hall stage or near/on top of the TV in the case of a home loop.

Loop cable routing
The induction loop cable is fed around the room and clipped to the skirting board or hidden under the carpet edge if present. The induction loop cable is terminated at the loop output socket on the rear of the loop amplifier.

A microphone/CD/ipod etc can then be plugged into the induction loop amplifier. Audible sound reaching the microphone is converted into a small electrical signal and fed into the amplifier. The amplifier then amplifies this signal and feeds this around the room - through the loop cable as an alternating current (a.c.) signal. The bigger the room, the bigger and more powerful the amplifier needed for the job. 

Testing the loop level to British Standards
We recommend you purchase a dual function induction loop test meter. Full instructions are included.

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