Loop Layouts

There are 6 basic types of loop layout for an audio induction loop system:

What do these pictures mean?

Overspill (counter) loop

One to one communications Counters, reception desks, intercoms etc. 1 small amplifier

Perimeter loop

Area coverage, spaces up to 25m wide with NO METAL LOSS Area coverage, spaces up to 2-6m with metal loss (depends on level) Spill allowed up to 4x width away 1 loop amplifier required

Single array

Areas with metal loss but wider than 2-6m maximum Only for fixed seating areas, e.g. theatre, classroom 1 loop amplifier required

Cancellation loop

Areas suitable for a perimeter loop where spill control is required on one side only Adjacent classrooms etc. 1 loop amplifier required

Low loss array

Large areas with metal loss Areas in excess of 25m wide Balconies in theatres

Ultra low spill array

Adjacent rooms Confidentiality Nearby interfering systems Large areas with metal loss / in excess of 25m wide

What do these pictures mean?

Ampetronic colour plots show the distribution of magnetic field around a loop system, from the side or from above. Black is -40dB below the target field strength, effectively background noise only. Yellow areas meet the target field strength, white exceeds it. The plots give a good indication of how well a loop will meet the requirements for your application.