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Redback® Hearing Loop Ampliers
3.8 PLACEMENT OF LOOPS
Optimum position for loop is at oor level (up to 250mm above) or under oor depending on access to oor covering
and oor structures or 2.4m to 3.5m above oor i.e. in suitable ceiling. (Bearing in mind the working area at ear level i.e.
1.2m sitting, 1.6m standing) However Loop Displacement, typically between 10% and 25% of loop width (up to 50% for
small room), can alter these gures for larger rooms especially for Perimeter loops. Keep cabling 500mm to 600mm away
from outside room border walls and preferably away from heavy trafc areas if placed under oor covering (protection of
cable). In some construction styles, the loop cable can actually be placed outside the room perimeter walls.
FINAL CHECKS:
Before an induction loop system is permanently installed, it is recommended that:
• Environmental electromagnetic noise should be checked with the venue’s lights and all electrical systems turned
on.
• The loop wire should be temporarily taped or tacked in place and the system fully tested before performing nal
installation.
• To check whether the loop system is interfering with audio-visual systems, the venue’s audio & video systems
should be on when testing the loop.
• If electric guitars are used, they should be checked during the pre-installation loop test in order to determine if
their magnetic pickups are sensitive to the planned loop location. Use of Dynamic Mics to be conned outside of
Loop area.
Fig 4.0 illustrates the typical frequency repsonse required.
Fig 4.0
Loop Design