Specifying Induction Loop Systems

The specification of an induction loop system can be complex, requiring detailed knowledge of the all the necessary elements of the system, the loop design options available & their limitations, amplifier selection and the international Standard for operation.

There are many factors to consider before selecting the equipment required for the system. For example an amplifier/driver should never be specified simply on area coverage as such factors as area aspect ratio, loop design and metal losses and required current must also be calculated.

To this end the majority of our clients come to Ampetronic for assistance with system specification. Ampetronic offer this service free of charge and our support team will happy to discuss any areas that require clarification. Click here to fill in our specification questionnaire.

Click here for examples of generic system specifications.

If you would like to specify the system yourself a good place to start is by asking the ‘Ampetronic 6 questions’, the answers to which should enable you to both design and specify a system that will perform to the required international standard.


Basic Overview of System Specification Steps

1. Gather all the answers to Ampetronic’s 6 questions.


2. Define the required loop system type for the application

a) Localised overspill loop

b) Perimeter loop system

c) Cancellation

d) Single array

e) Phased array:

i) Low spill

ii) Metal-compensation

iii) Large area

iv) Balcony


3. Define the loop details

a) Shape (requires a design for phased arrays)

b) Position (under flooring, wall mounted or in the ceiling etc)

c) Number of Turns

d) Material section


4. Calculate Current and Voltage headroom requirements


5. Define required inputs

What type and number of AV inputs are required for the system (microphones, AV systems, mixing desks etc)


6. Select the appropriate equipment

a) Audio input sources

i) Appropriate microphone types

ii) TV/AV connections

b) Amplifier/Driver(s) for required current

i) Perimeter loop only

ii) Phase shift capable

iii) Rugged environment

iv) Tamper proof

v) Rack mountable

c) Loop material

i) Copper tape

ii) Copper wire

iii) Burial cable

iv) Warning tape

v) Protective extrusion

d) Receivers

i) Receiver for users without t-coil enabled hearing aids

ii) Receivers with testing capabilities for staff

e) Signage

i) Hard of hearing ‘T’ sign for each entry point, clearly visible from within the looped area

ii) Map of the looped area