Considerations in Hearing Loop System Design

Considerations in Hearing Loop System Design

What Kind of Loop System Do I Need?

A hearing loop system requires many considerations such as; input audio, loop driver, a loop design, the physical loop, installation accessories and test equipment for commissioning and subsequent maintenance.

Jands has partnered with Ampetronic, a global loop technology leader to ensure that from quotation to design to installation, a whole system view is taken. This approach ensures the best possible solution for your assistive listening needs.

Providing us with as much information as possible on the below seven subjects will help us to prepare an accurate quotation or design in a timely manner. Please download, complete the Hearing Loop Design Request Form with your feedback on the below points and submit the form here. 

1. Site Details

We need a site name for your project. We will then allocate a unique project reference number e.g. DP1203, which you can quote for any further inquiries about the project. It is also very useful for us to actually know what the project is, so we fully understand the way the loop system might be used.

2. Application / System Use

What type of system is needed? Is a local system required to assist communication across a desk or counter (e.g. in a bank), or will the loop need to cover a defined area? What inputs are needed; line level input (say from an audio mixer desk), microphone input and how many of each?

3. Australian Standards Compliance

Are there requirements to meet a particular Australian Standard? There are two relevant Australian Standards, AS 1428.5 and AS 60118.4. Each standard has slightly different performance parameters which will affect the outcome of the loop design. For more information on the differences please read the Hearing Augmentation Australian Laws and Standards Explained guide.

4. Controlling Spill and Interference

A simple loop system will be audible for a considerable distance (up to 3 times the width of the loop in both the horizontal and vertical directions) outside the loop. Is this likely to be a problem? For example, are there any other loop systems nearby, next to, above or below (existing, planned or possible in the future)? Also, are there any issues of confidentiality? For example, two classrooms next to each other will need a low spill design to minimise overhearing from one to the other. A courtroom or council chamber used for confidential meetings may also require a low spill design. Please state in which directions the spill control is required.

5. Site Drawings

For a design to be created, Jands will need scaled plans of the room(s) showing basic outline and the area to be covered. Electronic drawings are acceptable in dwg format. If low spill designs are required, the drawings should show the proximity of the rooms. If vertical spill is an issue or the loop is intended to be installed at ceiling level, a scaled section drawing will also be required.

6. Metal Structures

An appreciation of the amount and type of metalwork contained within or close to the loop area is very important in designing a loop system. If metal structures are not properly assessed, your loop system may not work at all. Please provide any details that you have regarding floor or ceiling metalwork, for example reinforcing mesh, metal system floors and suspended ceiling grids will all have an effect. For counters, we need to know if the counter is all metal or does it have a metal front panel?

7. Installation Method

How and where are the loops going to be installed? Can single insulated cable be used, or will the loop be installed under a floor covering using flat copper tape?

Note that rooms with metal loss or issues of low spill / confidentiality will need special design and the loop wires will cross the room at a number of points.

Flat copper tape is usually the easiest to install under the carpet in this case, but alternatively, ordinary wire enclosed within plastic conduit may be installed either in the screed or above the suspended ceiling (depending on the height).

For more information please contact Jands

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