Where do hearing loops fall short: metal, spill, noise and upkeep?

Why it matters

A hearing loop reaches telecoil users through their own hearing aids, with no receiver to borrow¹, and IEC 60118-4 sets the field strength and frequency response it must deliver². Whether a particular loop meets those targets depends on the metal in the building, the rooms around it, the electrical installation and how the loop is run from day to day³. Staff without a telecoil or loop receiver cannot hear the loop, so faults may go unnoticed⁴.

What the evidence shows

Metal in the building

• How large the loss is. A loop maker gives losses from metal as usually up to 3 dB per octave, growing towards high frequencies so that speech sounds muffled; it calls more than 15 dB of loss at 1 kHz in the centre of a perimeter loop over a reinforced concrete floor not unusual, and reports losses above 25 dB⁵. Bavarian state planning guidelines give up to 10 dB per octave³.
• Uneven as well as weaker. In the Bavarian guidelines' simulation of a 14 x 10 m perimeter loop, the field varied by 2.4 dB across the room with no metal and by 13 dB over typical reinforced concrete, even with the current raised from 7.5 A to 13 A, which falls outside the standard³. In the loop maker's example, a loop needing 8 A without metal would need 45 A to make up the loss, and its field would still be uneven⁵.
• How wide a simple loop can be. The UK distributor of one maker's loop amplifiers puts the widest floor-level perimeter loop for seated listeners at about 22 m with no metal, 6-10 m over standard reinforced concrete, 3-6 m over heavy reinforced concrete and 1-3 m over a steel deck or metal floor system⁶. Other sources set lower limits even without metal: about 12 m³, about 13.7 m⁷, and 15 m for a floor-level loop, beyond which one maker says the field varies by more than 6 dB⁸.
• Rated area and real area. The Bavarian guidelines warn that an amplifier rated for 1,000 m² may cover only about 80 m² to IEC 60118-4 in a real room, because makers' area figures assume no metal and ideal proportions³.
• What corrects it. A metal loss corrector in the amplifier flattens the frequency response⁵; one maker says its drivers correct up to 4 dB per octave, at the cost of up to 4 dB more voltage headroom⁸. The distributor notes that the correction is right at only one point, so where the field varies by more than 6 dB, smaller loops are needed, or the loop can be moved away from the metal⁶. Arrays of narrow loop segments driven out of phase compensate metal loss and even out the field^9,3. In extreme cases, the Bavarian guidelines say, loops cannot be used and another system must be chosen³.
• Measured in a building. In a 2008 audit of all 31 loop areas in Australia's Parliament House, made after each amplifier had been set up, 9 gave a suitable level over 80-100% of the area, 3 over 20-80%, 3 over less than 20%, and 16 had a low base level with excessive attenuation. The auditors blamed the loop layouts and recommended redesigned loops, newer amplifiers, equalisers for metal loss where needed, and rework commissioned by an officer experienced with loops¹⁰.

Spill beyond the room

How far a simple perimeter loop's signal reaches depends on the level each source counts as audible or disturbing^11,6,12:

• Up and down. From first measurements in real buildings, a German acoustician gives provisional attenuation through floors of 0 dB for timber joists, 6 dB for reinforced clay-block floors and 12 dB for reinforced concrete; with 3 m storeys, the next looped room above an 8 x 5 m perimeter loop could be five floors up¹². The Bavarian guidelines say vertical spill can hardly be controlled with reasonable effort, that looped rooms should not be planned one above another, and that in a few cases spill has travelled vertically through metal columns in ways not yet explained³.
• What contains it. Phased arrays of narrow, phase-shifted loops cut the field by about 20 dB at about 1 m outside the covered area⁹, and low-spill versions cut sideways spill sharply, confining it to the room in the Bavarian guidelines' simulation^11,3. They help less vertically: array spill can reach up to five segment widths, so with 2 m segments the next looped room could be three floors up¹². A cancellation loop limits spill in one or two directions at lower cost but leaves part of the room without full coverage⁶, and arrays are more complex to install than perimeter loops¹³.
• Mistakes found in built loops. The Bavarian guidelines list looped rooms placed directly above one another, neighbouring rooms each with a simple perimeter loop, which then cannot be used at the same time³.

Magnetic background noise

• Limits. A loop distributor summarises the standard as wanting background magnetic noise no worse than -47 dB(A), accepting -32 dB(A), and calling for investigation before installing between -22 and -32 dB⁴; a loop maker's commissioning target is -32 dB (A-weighted) or better¹⁴. The Parliament House audit aimed for a signal-to-noise ratio of 45 dB, with 25 dB as the minimum¹⁰.
• Where it comes from. The Bavarian guidelines name transformers, distribution boards, faulty electrical installations and unsuitable dimmers³; a German acoustician names unbalanced installations and poorly suppressed switchgear, which, the acoustician says, good planning largely prevents⁹. In one Parliament House room, television studio lamps and their wiring caused above-normal hum¹⁰.
• A measured case. In a consultancy case study commissioned by the architect of a new Canadian university building, a consultant traced hum to ground currents of about 1 A on steam and water pipes, putting the signal-to-noise ratio for telephone listening at about 0 dB in most cases; regrounding cut the field along the pipes by about 4 dB but raised it near the worst-affected office, and a basement seminar room exposed to the field of the building's 600 A electrical service was given an FM system because shielding it was impractical. A follow-up found interference in some places in most of the campus's buildings. The telephone readings concern the shared telecoil reception path, rather than a venue loop's signal-to-noise ratio¹⁵.
• What listeners report. Electrical buzzing was among complaints in a maker-funded convenience survey of 866 loop users¹⁶, and interference picked up by telecoils also reaches people using neckloops with FM and infrared receivers¹. A US federal advisory committee lists susceptibility to electrical interference among loop drawbacks¹⁷.

Where the listener sits and how the head is held

• The field a telecoil uses. For most hearing aids, the vertical component of a loop's field is the one that counts¹¹. Because the loop lies at a different height from listeners' heads, that component can be about equally strong near the cable and in the middle of the room⁹.
• Height matters. A perimeter loop at listening height gives a very uneven field: in a distributor's example, 0.25 m vertically from the loop, about -1 dB at the room's centre and over +9 dB at the edge. The widest usable loop also differs between seated (1.2 m) and standing (1.7 m) listeners⁶, and a maker's commissioning guidance measures at both heights where audiences sit and stand¹⁴.
• Dead lines. Figure-of-eight and multi-segment loops leave a line with no reception where the segments meet, and the Bavarian guidelines rule out comb layouts for their dead zones; phased arrays avoid such null lines³.
• Head tilt. A hearing aid maker's patent states that a telecoil 45 degrees from its best orientation receives about 3 dB less, 60 degrees about 6 dB less and 90 degrees almost nothing; because telecoils are often mounted at 15 to 45 degrees inside the hearing aid, a stooped wearer tilting the head 30 degrees could be 75 degrees off in an extreme case¹⁸. In phased arrays the horizontal field component is even, about 3 dB weaker than the vertical, so users whose coil lies horizontally can still listen⁹. Loop users' complaints include telecoil orientation¹⁶, and the table of contents of Australia's standard lists telecoil orientation and blind zones¹⁹.
• Counters. Small counter loops are held to a looser tolerance: ±8 dB for small area systems against ±3 dB for large ones, in a European standards report¹¹, or a total variation of 9 dB, in a distributor's summary of the superseded 2006 edition, which adds that the standard does not define the usable listening volume at a counter⁴.

Upkeep: switched off, untrained staff, unnoticed faults

• Checked by listeners. In about 500 reports gathered by UK charity volunteers in 2009, nearly half found the loop not working properly, with complaints of untrained staff and loops not switched on²⁰. At an English hospital trust in 2017, two volunteers with hearing loss found three of about seven listed loops working, one only after they had earlier shown staff how to use it; one was reported faulty, two needed investigation and staff training, and at one reception no loop unit could be found²¹. The maker-funded loop survey and a self-selected survey of 1,519 people by hearing-loss advocates, with funding unstated, report loops left switched off, uneven signals, dead spots and untrained staff^16,22.
• Why faults go unnoticed. A distributor says well-installed loops rarely break down but are often switched off, have microphones moved or unplugged, have their controls adjusted or their cable cut, and that nobody notices because only hearing aid users listen⁴. A US federal advisory committee names failure to maintain equipment among common errors¹⁷.
• What sources ask for. The Bavarian guidelines require loops to be on whenever the public is present, to be checked at regular intervals and before use by a trained person with a loop receiver that shows the field level, and to have their cables tested for continuity during building work³. The distributor recommends staff checks with a loop receiver monthly and before events, plus periodic field strength measurement⁴. The IEC component standard includes recommendations for monitoring devices²³, and the IEC code of practice covers operation and maintenance²⁴. In the US, the ADA Title III rule requires accessible features to be kept in working order²⁵. RNID asks venues to keep testing and maintaining their loops for at least five years and potentially nearer 10²⁶, and an advocacy group asks installers for maintenance agreements and regular staff training²⁷.

What fixing costs

• Arrays and floor work. In Listen Technologies' 2013 examples, priced with its own products, a 150-seat church needing metal loss correction and spill control was priced at $11,731 with a low-spill array and saw-cut concrete, against $3,002 for a simple perimeter loop in a church of the same size; the main floor of a 1,000-seat theatre was priced at $19,899 without metal loss, and the same theatre with metal loss and its balcony and boxes added at $43,371, of which $18,000 was concrete cutting. The seller puts concrete sawing at $2 to $10 a foot and says site factors can change the installed cost two- to fivefold⁷.
• More current is no remedy. In a loop maker's example, a loop would need 45 A instead of 8 A to make up for metal loss, and its field would still be uneven⁵; the same maker's correction needs up to 4 dB more voltage headroom⁸.
• Small loops. Volunteers at a hospital trust put a portable loop at about £100 and a counter loop at about £100 plus installation²¹.
• Timing. An advocacy group advises installing loops during a remodel, a new build or a flooring replacement to cut cost²⁷, and the loop seller says on a new build without metal loss the loop can be laid in two to six hours before the floor covering goes down⁷.
• Compared with other systems. The Bavarian guidelines rate equipment and installation cost lowest for loops, about twice as high for FM and 2.5 times as high for infrared, with no receivers to issue to telecoil users³. A federal advisory committee calls a permanent loop an inexpensive option for jury assembly areas¹⁷, while a maker that sells all four kinds of system lists loops as costly and intrusive to install²⁸.

Where loops perform well in measured use

• In two Polish rooms. In an independent study funded by Polish and Norwegian research grants, loops calibrated to IEC 60118-4 in a meeting room and in a church with about 5 s of reverberation significantly raised intelligibility for 22 hearing aid users, with 10 normal-hearing listeners as a reference group; with the loop, sentence intelligibility for mild losses reached about 95% and no longer depended on reverberation, and reported listening problems fell by more than 62 percentage points²⁹.
• Over a steel-reinforced floor. In a university lecture hall, in a study funded by a hearing-aid maker, an assistive listening maker and a loop advocate's foundation, a loop installed to IEC standards raised the 26 hearing aid users' sentence scores from 14% to 88% at a -3 dB signal-to-noise ratio; the study also included 45 normal-hearing listeners³⁰.
• In other measurements. At two seats in a reverberant room, an independent German university study, with funding unstated, found that a loop raised the Speech Transmission Index into the excellent range⁹, and 9 of the 31 Parliament House loops gave a suitable level over 80-100% of their area¹⁰. In the convenience survey of 866 loop users, paid for by loop, assistive listening and hearing-device technology companies, respondents rated their hearing 8.7 out of 10 in a looped venue against 4.9 without the loop¹⁶.
• The feed matters too. In a university concert study funded by AGE-WELL Canada, with hearing aids and fittings provided by Sonova Canada, 20 people used study telecoil hearing aids and 8 used their own aids without telecoils. The stage-microphone loop feed did not score significantly differently from no feed, while the balcony-microphone feed scored worse³¹.

Where sources disagree

How far spill reaches depends on the level each source counts: one to two loop widths above -32 dB⁶, two to three widths⁷, about three widths down to the -47 dB background level¹², and about four room widths within which a signal is audible¹³. A European standards report puts the field at -30 dB one loop width away and treats levels below -40 dB as inaudible¹¹.

On metal, a loop maker gives losses as usually up to 3 dB per octave⁵, while the Bavarian guidelines give up to 10 dB per octave³. The widest simple perimeter loop with no metal ranges from about 12 m³ and 13.7 m⁷ to 15 m⁸ and 22-26 m⁶.

On upkeep, a German acoustician writes that properly built loops work reliably with little maintenance⁹, and a distributor that good loops rarely break down⁴, yet each field check found many loops off, weak or broken^10,20,21. Where the checks give causes, they name loop layouts¹⁰, incorrect installation and staff who did not know how to use the loop²¹.

On cost, the Bavarian guidelines rate loops the cheapest system to install³ and a federal committee calls them inexpensive for jury assembly areas¹⁷, while a maker of all four systems calls them costly and intrusive²⁸; the same maker's 2013 examples show a fourfold spread between churches of the same size⁷.

What would settle it

Field audits of a representative sample of installed loops, measured to IEC 60118-4 on a stated protocol and repeated over the years, recording whether each loop was on, whether staff knew how to use it, and its field strength, frequency response and background noise: the newest measured audit found is from 2008 and covers one building, and the news report on the larger volunteer survey gives no test protocol^10,20. Independent measurements of metal loss on common floor constructions, and of sideways and vertical spill with the threshold stated: the floor attenuation figures found are provisional, and most spill figures come from illustrative plots or makers' design software^12,13,11. Surveys of magnetic noise in buildings with current lighting and electrical equipment: the one measured case found dates from the early 1990s¹⁵. Listener tests of head position and posture in looped rooms: the tilt figures found come from geometry in a patent¹⁸. Installed costs from completed projects, including retrofits: the cost examples found are list prices from 2013⁷.

Planning while it is open

• Measure metal loss and magnetic background noise on site before designing, with the room's lighting and equipment switched on, and base the layout on the results rather than on a simulation alone^8,3,7,27.
• Treat amplifier coverage ratings as best-case figures, and plan arrays where metal or room width needs them^3,6.
• Avoid stacking looped rooms or placing rooms with simple perimeter loops side by side; where that cannot be avoided, plan low-spill arrays and measure attenuation through the floor^3,12.
• Where confidentiality matters, record the distance at which the signal becomes inaudible¹⁴.
• Keep the loop away from listening height, and measure at seated and standing heights where audiences do both^6,14.
• Commission to IEC 60118-4 with a written test report covering at least six points, and record where the cable runs³.
• Keep the loop on whenever the public is present, train staff, and have a trained person check it with a loop receiver before use and at regular intervals, with periodic field strength measurement^3,4.
• Where possible, install during a new build, remodel or flooring replacement, and budget for arrays and floor cutting where the site survey shows they are needed^27,7.

Sources

1. Comparison of Large Area Assistive Listening Systems. Compton-Conley C. Hearing Loss Association of America (reprint), 2015. Nonprofit advocacy (reprinted by HLAA with the contact address of its Get in the Hearing Loop program; written by Cynthia Compton-Conley, PhD, of Gallaudet University; who paid for the original is not stated) ↩︎ https://www.hearingloss.org/wp-content/uploads/comparison-of-large-area-assistive-listening-systems.pdf
2. IEC 60118-4:2014 Electroacoustics - Hearing aids - Part 4: Induction-loop systems for hearing aid purposes - System performance requirements. IEC TC 29 (Electroacoustics). International Electrotechnical Commission, 11 December 2014. Standards body (International Electrotechnical Commission; the full text is sold, and only the abstract is public) ↩︎ https://webstore.iec.ch/en/publication/798
3. Induktive Höranlagen beim Freistaat Bayern: Planungsrichtlinien, Stand 01.01.2019 (Hearing loops in Bavarian state buildings: planning guidelines). Bavarian State Ministry for Housing, Building and Transport; text by Ertl F (Government of the Upper Palatinate) and Jaggo T (Landesverband Bayern der Schwerhörigen und Ertaubten). Bayerisches Staatsministerium für Wohnen, Bau und Verkehr, 1 January 2019. Government (Bavarian State Ministry for Housing, Building and Transport, for state building projects; written with the technical officer of the Bavarian association of hard-of-hearing and deafened people, a hearing-loss organisation, and including a comparison table used with the permission of an engineer from the German hard-of-hearing association) ↩︎ https://mobilitaet.bayern.de/assets/stmi/min/181217-induktive-hoeranlagen.pdf
4. Loop Performance Standard IEC 60118-4:2006. UnivoxAudio Ltd. UnivoxAudio (knowledge centre wiki), undated (read 13 October 2026). Manufacturer (UnivoxAudio Ltd, the UK and Ireland distributor of the Swedish loop maker Bo Edin's Univox loop amplifiers) ↩︎ https://www.univoxaudio.co.uk/knowledge-centre-wiki/standards-legislation-and-best-practice/standard-iec-60118-4-2006
5. Effects of Metal Structures on Inductive Loop Performance. Ampetronic. Ampetronic (learning zone web page), undated (read 9 October 2026). Manufacturer (Ampetronic, which makes hearing loop drivers with metal loss correction and the array systems the page recommends, and offers a design service) ↩︎ https://www.ampetronic.com/info-centre/learning-zone/metal-structures/effects-on-loop-performance/
6. Loop Configurations Explained: why one size does not fit all. UnivoxAudio Ltd. UnivoxAudio (knowledge centre wiki), undated (read 9 October 2026). Manufacturer (UnivoxAudio Ltd, the UK and Ireland distributor of the Swedish loop maker Bo Edin's Univox amplifiers and SuperLoop systems, which the page describes and sells) ↩︎ https://www.univoxaudio.co.uk/knowledge-centre-wiki/a-guide-to-induction-loops/loop-configurations
7. Installing Hearing Loop Systems and Costing. Listen Technologies. SynAudCon (prosoundtraining.com), 12 August 2013. Manufacturer (Listen Technologies, which sells the loop drivers, phased array kits and design service priced in the examples; published on the audio training site of SynAudCon) ↩︎ https://www.prosoundtraining.com/2013/08/12/installing-hearing-loop-systems-costing/
8. HLS-2D Metal Loss Test Procedure (document UP17940-4). Ampetronic, undated (read 9 October 2026). Manufacturer (Ampetronic; the procedure is written for its own HLS-2D test driver, field strength meters, design software and loop drivers) ↩︎ https://www.ampetronic.com/wp-content/uploads/2019/05/UP17940-4-HLS-2D_Metal_Loss_Test_Procedure.pdf
9. Induktive Höranlagen in Kinos und Kongressräumen (Hearing loops in cinemas and conference rooms). Seidler H. Fortschritte der Akustik, DAGA 2012, Darmstadt (German Acoustical Society), pp. 97-98, March 2012. Independent (TU Dresden, ear, nose and throat clinic of the Carl Gustav Carus university hospital); funding not stated ↩︎ https://pub.dega-akustik.de/DAGA_2012/data/articles/000413.pdf
10. Audio Frequency Induction Loops Audit in Parliament House, for the Purpose of OH&S Compliance (version 0.1). Ciolek M, Covington J (Broadcasting Infrastructure and Support, Department of Parliamentary Services). Parliament of Australia, Department of Parliamentary Services (published with the Senate Finance and Public Administration committee's 2011-12 Budget Estimates documents for the parliamentary departments), December 2008. Government (an in-house audit by the Australian Parliament's Department of Parliamentary Services of the hearing loops it maintains in Parliament House, carried out by its own broadcasting support staff) ↩︎ https://aph.gov.au/~/media/Estimates/Live/fapa_ctte/estimates/bud_1112/parliamentary/p21d.ashx
11. ETSI TR 103 614 V1.1.1: Electromagnetic compatibility and Radio spectrum Matters (ERM); Hearing Loop System (HLS) intended to assist the hearing impaired in the frequency range 0 Hz to 9 kHz; System Reference Document. ETSI Technical Committee ERM. European Telecommunications Standards Institute, January 2022. Standards body (ETSI, the European telecommunications standards organisation, whose members include manufacturers; a system reference document that asks European spectrum regulators to keep 10 Hz to 9 kHz available for hearing loops, and that supports a radio-equipment standard it says the International Hearing Loop Manufacturers Association is drafting) ↩︎ https://www.etsi.org/deliver/etsi_tr/103600_103699/103614/01.01.01_60/tr_103614v010101p.pdf
12. Vertikale Feldausbreitung von induktiven Höranlagen (Vertical field spread of hearing loops). Seidler H. Fortschritte der Akustik, DAGA 2015, Nürnberg (German Acoustical Society), pp. 583-585, March 2015. Independent (TU Dresden, medical faculty, ear, nose and throat department); funding not stated ↩︎ https://pub.dega-akustik.de/DAGA_2015/data/articles/000428.pdf
13. Combating induction or hearing loop spill. Ampetronic. Ampetronic (learning zone web page), undated (read 9 October 2026). Manufacturer (Ampetronic, which makes hearing loop drivers, including the low-spill array systems the page describes, and offers a design service) ↩︎ https://www.ampetronic.com/info-centre/learning-zone/loop-spill-explained/
14. Commissioning an Induction Loop System. Ampetronic. Ampetronic (learning zone web page), undated (read 9 October 2026). Manufacturer (Ampetronic, which makes hearing loop drivers and loop test equipment and sells installer training) ↩︎ https://www.ampetronic.com/info-centre/learning-zone/testing-and-maintaining/commissioning/
15. Electromagnetic Interference in Hearing Aid T-Coil Applications. McKinnon B (Mc² Systems Design Group). Mc² Systems Design Group (paper first presented at the 1994 CAA Conference, Ottawa), 1994. Independent (Mc² Systems Design Group, an acoustics and sound-system design consultancy that specifies assistive listening systems, retained by the building's architect to investigate complaints) ↩︎ https://www.mcsquared.com/classic/caa94.htm
16. Consumer Perceptions of the Impact of Inductively Looped Venues on the Utility of Their Hearing Devices. Kochkin S, Sterkens J, Compton-Conley C, Beck DL, Taylor B, Kricos P, Caccavo M, Holmes A, Powers TA. Hearing Review (October 2014 issue), 24 September 2014. Manufacturer (paid for by grants from Etymotic Research, Contacta, Listen Technologies, IntriCon and Univox by Edin, which the acknowledgments describe as including two hearing loop makers, an assistive listening company and two hearing-device technology makers; co-author Juliëtte Sterkens runs the Loop Wisconsin advocacy blog, one of the recruitment channels. The article prints no affiliations; from other sources, co-author Douglas L. Beck worked for the hearing-aid maker Oticon, joining as director of professional relations in 2005 (AudiologyOnline, 20 August 2005) and named director of academic sciences in 2016 (Hearing Review, 6 April 2016), and co-author Thomas A. Powers was vice-president of audiology at the hearing-aid maker Siemens Hearing Instruments (Hearing Review, 19 September 2013) and later a vice-president of its successor, Sivantos (Better Hearing Institute biography)) ↩︎ https://hearingreview.com/hearing-products/implants-bone-conduction/cochlear-implants/consumer-perceptions-impact-inductively-looped-venues-utility-hearing-devices
17. Justice for All: Designing Accessible Courthouses (recommendations from the Courthouse Access Advisory Committee). Courthouse Access Advisory Committee. US Access Board, 15 November 2006. Government (US Access Board federal advisory committee of 35 members, among them the Hearing Loss Association of America, courts, architects, code bodies and disability groups) ↩︎ https://www.access-board.gov/ada/additional-resources/designing-accessible-courthouses.html
18. Ear-worn electronic device configured to compensate for hunched or stooped posture (US 11,778,392 B2). Burwinkel JR, Seitz-Paquette K. United States Patent and Trademark Office, 3 October 2023. Manufacturer (Starkey Laboratories, a hearing aid maker, is the assignee) ↩︎ https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/11778392
19. AS 1428.5:2021 Design for access and mobility, Part 5: Communication for people who are deaf or hearing impaired. Standards Australia. Standards Australia (Standards Store), 3 September 2021. Standards body (Standards Australia) ↩︎ https://store.standards.org.au/product/as-1428-5-2021
20. RNID calls for businesses to do better on induction loops. Disability News Service, 23 May 2009. Nonprofit advocacy (reports gathered by campaign volunteers of the UK charity RNID and released for its Deaf Awareness Week campaign; reported by Disability News Service; labelled advocacy rather than an independent test because the reports were gathered for a campaign, with no test protocol described in the news report) ↩︎ https://www.disabilitynewsservice.com/rnid-calls-for-businesses-to-do-better-on-induction-loops/
21. Hearing Loops at UHS FT: Audit of Hearing Loops. Dymond HF, for the sensory loss group and Healthwatch Southampton. Healthwatch Southampton (reports library of Healthwatch England), May 2017. Government (Healthwatch Southampton, the city's statutory health and social care watchdog, funded through the local authority; the audit was done by two of its volunteers with hearing loss, as members of University Hospital Southampton's sensory loss group) ↩︎ https://nds.healthwatch.co.uk/sites/default/files/reports_library/20170502_Southampton__Hearing-Loops-at-UHS-FT-Report.pdf
22. Consumer use of and preferences for assistive communication technology in public places. Committee for Communication Access in America (Frazier SO, Bailey A, Cadwell B, Clifford C, Liebe K, Myers D, Sterkens J). Committee for Communication Access in America, 8 January 2024. Nonprofit advocacy (an ad hoc committee of hearing-loss advocates, chaired by Stephen O. Frazier (Loop New Mexico; a founding member of HLAA's Get in the Hearing Loop initiative), the report's correspondence author; funding not stated; data collected and analysed by the Frost Center for Data and Social Research at Hope College. The committee's site lists David Myers (founder of hearingloop.org) and Juliette Sterkens (HLAA hearing loop advocate) among its members, with Abram Bailey (founder of HearingTracker), Blake Cadwell (founder and CEO of Soundly), Kevin Liebe (hearinghealthmatters.org) and Carol Clifford (audiologist, former ReSound training director)) ↩︎ https://www.ccaa.name/Report_Final_1-12-24.pdf
23. IEC 62489-1:2010+AMD1:2014+AMD2:2017 Electroacoustics - Audio-frequency induction loop systems for assisted hearing - Part 1: Methods of measuring and specifying the performance of system components. IEC TC 29 (Electroacoustics). International Electrotechnical Commission, 27 November 2017. Standards body (International Electrotechnical Commission; the full text is sold, and only the abstract and a preview are public) ↩︎ https://webstore.iec.ch/en/publication/62119
24. IEC TR 63079:2017 Code of practice for hearing-loop systems (HLS). IEC TC 29 (Electroacoustics). International Electrotechnical Commission, 10 April 2017. Standards body (International Electrotechnical Commission; the full text is sold, and only the abstract and a preview of the opening pages are public) ↩︎ https://webstore.iec.ch/en/publication/32554
25. 28 CFR 36.211: maintenance of accessible features (ADA Title III regulation). US Department of Justice. eCFR, 15 September 2010. Government (US Department of Justice) ↩︎ https://www.ecfr.gov/current/title-28/section-36.211
26. Auracast: a revolution in audio accessibility (RNID Auracast report). RNID (Royal National Institute for Deaf People). RNID, 11 February 2025. Nonprofit advocacy (RNID, UK charity) ↩︎ https://rnid.org.uk/wp-content/uploads/2025/02/Final-Auracast-Report-110225.pdf
27. Hearing Loops: Installations. Center for Hearing Access (The John G. Shedd Institute). Center for Hearing Access, undated (read 13 October 2026). Nonprofit advocacy (Center for Hearing Access, a 501(c)(3) advocacy and education initiative of The John G. Shedd Institute for the Arts, founded in 2024, whose website succeeded hearingloop.org; it states that it accepts no donations from hearing-related vendors) ↩︎ https://centerforhearingaccess.org/biz-hearing-loop-installation/
28. Understanding the Assistive Listening Americans with Disabilities Act. Listen Technologies, 25 October 2023. Manufacturer (Listen Technologies, which sells RF/FM, infrared, hearing loop, Wi-Fi and Auracast assistive listening products; owned since February 2023 by Allvida, which also owns the hearing-loop maker Ampetronic) ↩︎ https://www.listentech.com/wp-content/uploads/2019/07/ADA-White-Paper-2023-10-25-vA1-WEB.pdf
29. Speech Intelligibility in Rooms with and without an Induction Loop for Hearing Aid Users. Kociński J, Ozimek E. Archives of Acoustics 40(1):51-58, 27 January 2015. Independent (Adam Mickiewicz University in Poznań; supported by a grant from Poland's National Science Centre and by Norway through the Norwegian Financial Mechanism) ↩︎ https://doi.org/10.1515/aoa-2015-0007
30. Effects of Hearing Loop Systems on Speech Understanding and Sound Quality of Normal-hearing Listeners and Hearing Aid Users. Magann Faivre R, Ismail F, Sterkens J, Thunder T, Chung K. Hearing Review 23(8):28, 18 July 2016. Manufacturer (the authors state the research was funded by GN ReSound, a hearing aid maker, and Listen Technologies, an assistive listening and loop maker, together with the David & Carol Myers Foundation, the family foundation of loop advocate David Myers; study run at Northern Illinois University; co-author Juliëtte Sterkens is a hearing loop advocate whose outreach that foundation funds) ↩︎ https://hearingreview.com/hearing-products/testing-equipment/effects-hearing-loop-systems-speech-understanding-sound-quality-normal-hearing-listeners-hearing-aid-users
31. Evaluating a hearing loop implementation for live orchestral music. McWeeny S, Trainor LJ, Armstrong S, Bosnyak D, Tawfik H, Bruce IC. Ear and Hearing 46(3):808-816, 27 January 2025. Independent (McMaster University; AGE-WELL Canada grant); in-kind hearing aids and fittings from Sonova Canada ↩︎ https://pubmed.ncbi.nlm.nih.gov/39868727/

Change log

• 10 October 2026Published with 31 sources.
• 13 October 2026Qualified cost comparisons and installation timing; added study context and separated telephone evidence.
• 13 October 2026Clarified that the cost comparison uses worked prices, not completed projects.

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