Audio source
Speech, presentation audio, video content, paging or another nominated program source enters the system.


A practical Australian guide for architects, builders, facility managers, schools, councils, government agencies, places of worship and commercial organisations planning hearing augmentation systems.
A compliant and useful hearing augmentation system must be selected, designed, installed, tested, documented and maintained around the building, the audio system and the people who will use it.
Hearing loops are one form of assistive listening technology. Other available approaches include radio-frequency receivers, infrared, Wi-Fi audio and emerging Auracast broadcast audio. The correct solution depends on the regulatory pathway, room construction, privacy requirements, user access, expected occupancy and operational responsibilities.
A hearing loop—also called an induction loop, audio-frequency induction loop or T-loop—transmits an audio signal through a magnetic field. A telecoil inside a compatible hearing aid or cochlear implant receives that signal and converts it back into sound for the user.
Rather than increasing the volume of every sound in a room, the loop can deliver the microphone, lectern, meeting, performance or presentation audio directly to the listener’s device. This can reduce the impact of distance, reverberation and background noise.
Speech, presentation audio, video content, paging or another nominated program source enters the system.
A mixer or DSP manages level, routing, equalisation and source selection before the loop feed.
The loop driver and installed cable create the magnetic field within the intended listening area.
A compatible telecoil receives the audio directly through the listener’s hearing aid or cochlear implant.
Hearing augmentation projects can involve building regulation, disability-access obligations, Australian Standards, international performance standards and project-specific design requirements.
The National Construction Code contains hearing augmentation provisions for nominated rooms and spaces where an inbuilt amplification system is provided. The project team must confirm the applicable NCC edition, building classification and approval requirements.
Visit the National Construction CodeThe Disability Discrimination Act 1992 and the Disability (Access to Premises—Buildings) Standards form part of the broader accessibility environment. Compliance should be coordinated with the project’s certifier and accessibility advisers.
Australian Human Rights CommissionAS 1428.5 provides guidance and requirements relating to communication for people who are deaf or hearing impaired, including assistive listening system design, application, testing and supporting accessibility measures.
Standards AustraliaIEC 60118-4 addresses audio-frequency induction-loop performance, including magnetic field strength, frequency response, background noise, measurement procedures and information provided to operators and users.
Review the IEC standard| Area | What must be considered | Project evidence |
|---|---|---|
| Requirement | Whether hearing augmentation is required for the particular room, building classification, amplification system and approval pathway. | NCC assessment, architectural documentation and certifier or access-consultant direction. |
| Coverage | The required usable area, seating locations, wheelchair spaces, standing positions and any separate balconies or zones. | Coverage drawings, test-point map and commissioning results. |
| Performance | Field strength, frequency response, background magnetic noise, intelligibility and consistency throughout the nominated area. | Calibrated test results and a formal commissioning report. |
| Operation | Audio routing, microphones, user controls, signage, receiver availability and staff procedures. | Operating instructions, training records and asset information. |
| Maintenance | Periodic functional testing, receiver charging, battery management, cleaning, fault reporting and system retesting. | Maintenance schedule, service records and updated test reports. |
Hearing augmentation systems are commonly considered in publicly accessible rooms and spaces that use an inbuilt amplification system. The applicable requirements should be confirmed for each project, building classification, room use and construction approval pathway.
Assembly halls, lecture theatres, classrooms, libraries, auditoriums, training rooms and presentation spaces in schools, universities and vocational facilities.
Education AV systemsChurches, chapels, worship centres, prayer halls and community spaces where sermons, music, spoken word and presentation systems are used.
House-of-worship AVCouncil chambers, hearing rooms, public meeting spaces, service centres, libraries, community buildings and government offices.
Government AV integrationBoardrooms, conference rooms, training areas, town-hall spaces, divisible meeting rooms and presentation environments.
Corporate AV solutionsAuditoriums, theatres, cinemas, conference venues, entertainment spaces, community halls and function rooms with amplified audio.
Venue AV through ACCAVCustomer-service desks, reception counters, ticketing positions, healthcare reception areas, security points and screened interview locations.
Request a site assessmentA project may use an induction loop, a receiver-based system or a combination of technologies. Selection should consider compliance, dignity of access, privacy, coverage, maintenance and compatibility.
A compact loop serves a defined position such as a reception desk, ticket counter, interview point or customer-service window.
Loop cable is installed around a room or nominated listening area. This can be effective in appropriate spaces with manageable metal loss and overspill conditions.
Multiple controlled loop segments create more consistent coverage and can reduce signal spill into neighbouring spaces.
Audio is transmitted to dedicated receivers. Users can listen through headphones, earbuds or an inductive neck loop connected to their personal hearing device.
Infrared light transmits audio within the intended room. Because the signal does not normally pass through walls, infrared can be useful where confidentiality or room separation is important.
Auracast uses Bluetooth LE Audio to broadcast to compatible personal devices and dedicated receivers. It offers significant potential but must be assessed carefully against the project’s current compliance and receiver-access obligations.
Hearing-loop performance can be affected by room geometry, reinforcement steel, structural metal, raised floors, electrical equipment, neighbouring loop systems, seating layout and the final installation height.
These conditions should be assessed during the design stage rather than discovered after flooring, joinery, ceilings or room finishes have been completed.
Early coordination between the AV integrator, electrical contractor, communications contractor, architect, builder, access consultant and certifier helps reduce rework and improves the likelihood of achieving consistent hearing-loop coverage.
Review the room, floor construction, amplification system, adjacent spaces, structural metal and existing electromagnetic interference.
Define the hearing augmentation technology, coverage area, loop arrangement, amplifier, DSP routing, cable pathway, signage and controls.
Coordinate loop cable, flooring, containment, rack equipment, audio interfaces, power, communications cabling and builder requirements.
Measure field strength, frequency response, magnetic background noise and coverage using appropriate calibrated testing equipment.
The assistive listening feed should be deliberately designed into the complete AV signal flow, with appropriate source selection, level control, processing and monitoring.
A DSP can create a dedicated hearing-assistance mix, manage levels, route selected microphones and exclude unsuitable sources.
Q-SYS integrationNetworked audio can distribute the hearing-assistance feed between rooms, DSPs, equipment racks and compatible assistive-listening transmitters.
Dante audio networkingRemote participant audio may need to be included with local microphones and presentation content without creating echo, feedback or double audio.
Meeting-room and corporate AVLectern microphones, wireless microphones, playback and presentation sources can be combined into a controlled accessible-audio mix.
Commercial audio systemsAccessibility planning should consider how emergency information is communicated through audible, visual and other required warning methods—not only the day-to-day hearing loop.
Education communication systemsSystem health, signal presence, receiver batteries, chargers, operating procedures and periodic performance tests require an ongoing support plan.
AV maintenance and supportMasters Voice Technology can evaluate products as part of a complete system design rather than selecting equipment only from a product datasheet.
Professional induction-loop drivers, low-spill systems, counter loops, design tools, measurement equipment and assistive-listening resources.
Visit Ampetronic MANUFACTURERHearing loops, RF, infrared, Wi-Fi audio, ListenTALK and Auri Auracast-based assistive-listening solutions.
Visit Listen Technologies MANUFACTURERFM, infrared, Wi-Fi, digital, hearing-loop and receiver-based assistive-listening technologies.
Visit Williams AVPractical answers for facility managers, builders, consultants, architects, schools, government agencies and building owners.
Masters Voice Technology can assist with room assessment, AV integration, hearing augmentation design coordination, electrical and communications infrastructure, installation, commissioning and ongoing support.



