Area Coverage Loops

Area Coverage Loops

Doís:
  • Do perform a site assessment for electromagnetic background noise and to assess the level of metal in the buildings construction
  • Do check whether raised steel deck floor tiles or aluminium suspended ceiling frames are being used or are proposed to be used
  • Do check if there is a stage or an area where electrical instruments are to be used within or near to the proposed looped area
  • Do check what the use, or uses, of the proposed loop area is going to be (seated, standing, free moving etc)
  • Do get help designing complex Multi Loop Phased array systems if you are unfamiliar with the process
  • Do get practical training or help if you are unsure how to install the system to IEC 60118-4 Standard
  • Do calculate the power and voltage headroom requirement of the loop system based on loop/feed cable length and type
  • Do check with the manufacturer that the proposed component parts of your Hearing Loop are fit for the application and are compatible with each other
  • Do carefully select a suitable microphone for you application. Remember that you are trying to capture only the wanted sounds to increase signal to noise ratio
  • When using flat copper tape, ensure that the floor is clean, dry and free from any sharp debris that may puncture the protective bonded film and ground the loop
  • When using flat copper tape on metal flooring, use a layer of insulating tape underneath copper tape
  • Use printed warning tape to bond copper tape to the floor to help mitigate damage by carpet fitters
  • Install the loop cable of copper tape a few centimetres away from the wall to avoid damage by carpet fitters
  • Check for ground loop issues which may cause interference with existing audio visual equipment
  • Commission the system to IEC 60118-4 Standard and provide a Certificate of Conformity for the venue manager
  • Listen to the audio quality of the system with a suitable receiver
  • Ensure that adequate signage has been placed at all entry point to the looped area and within the area itself
  • Train venue staff on how to operate and check the system Ė and supply a suitable Loop Receiver with basic field strength indication at each venue.
Doníts:
  • Donít specify an amplifier based solely on area coverage statistics stated on manufacturer datasheets
  • Never ignore the effects of metal loss on the system Ė a perimeter loop is rarely the correct solution in a building with modern construction
  • Donít install a perimeter loop on a wall at ear height Ė ever. This will overload the hearing aid when standing anywhere near a wall and produce an uneven field strength throughout the room
  • Donít use omnidirectional ceiling or wall mounted microphones in area coverage solutions. This collects all the sound in the room and transmits it to the loop amplifier Ė and ultimately the hearing aid, which only compounds the signal to noise ratio problem that the Hearing Loop system is supposed to solve
  • Donít assume that the system is working without listening to the signal using a suitable receiver or commissioning it the requirements of the IEC 60118-4 Standard
Click here for Best Practice Guide with diagrams, loop system solutions and other resources
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