Hearing Loop vs FM vs Infrared vs Bluetooth: Which to Choose

Four wireless technologies. Four different trade-offs. This guide explains exactly how each system type works, where each one fits, what the ADA says about each, and how to pick the right one for your situation.

Why This Decision Matters

Choosing the wrong system type is one of the most common and costly mistakes in assistive listening. A venue can buy and install a system, meet the receiver count in ADA Table 219.3, and still fail users because the technology does not suit the physical space.

An FM system installed in a building where multiple rooms share a frequency will bleed audio between spaces. An infrared system placed in an open-air amphitheater will drop out in sunlight. A hearing loop that covers only part of a sanctuary leaves some seats without any signal. These are not edge cases. They are predictable failures that come from choosing a system type without understanding the trade-offs.

This article explains the four main system types clearly, so you can match the technology to the space and the people who will use it.

How Each System Works: The Basics

Every assistive listening system does the same fundamental thing: it takes sound from a source (a microphone, a PA system, or an audio feed) and delivers it directly to the listener's ear. The difference between system types is the transmission technology used to bridge that gap.

• Hearing loop (induction loop): Converts audio into a magnetic field that a T-coil-equipped hearing aid or cochlear implant picks up directly, with no separate receiver worn by the user
• FM: Transmits audio over a licensed radio frequency. Users wear a small receiver that picks up the broadcast and delivers it through earphones or a neck loop
• Infrared (IR): Converts audio into invisible light waves. Users wear a receiver that picks up the signal within the room where the transmitter is installed
• Bluetooth: Transmits audio over a short-range digital radio protocol. Users connect a personal device or streamer. No dedicated venue infrastructure is required

The U.S. Access Board, which writes the technical guidance for ADA assistive listening standards, describes the recognized categories as: induction loop, infrared, FM radio, and hard-wired systems. Each is suitable for different settings.

Hearing Loop (Induction Loop): Strengths and Limits

A hearing loop is a wire installed around the perimeter of a space. Audio from a microphone or PA system is fed into a loop amplifier, which drives an electric current through the wire. That current creates a magnetic field inside the loop. Any hearing aid or cochlear implant with a built-in telecoil (T-coil) can pick up that field by switching to its T setting. No separate receiver is needed.

To understand how the T-coil functions on the user side, see: What is a telecoil (T-coil) and how does it help in public?

Where hearing loops work well

• Sanctuaries and worship spaces where many congregants wear T-coil hearing aids
• Theaters and concert halls where users want a seamless, receiver-free experience
• Ticket counters, service windows, and reception desks (counter loops)
• Large lecture halls where T-coil penetration among students is high
• Any space where the venue wants to eliminate the receiver lending/tracking burden

Limitations to plan around

• Requires professional installation and a loop driver amplifier; not portable
• Only works for users whose hearing aid or implant has a T-coil enabled; roughly 60% of hearing aids sold in the US include a telecoil, but not all users activate it
• Steel-reinforced concrete floors can interfere with the magnetic field
• Signal can "bleed" into adjacent rooms if not shielded properly
• Receivers are still required for users without a T-coil hearing aid (though ADA Exception 2 removes the hearing-aid-compatible receiver requirement when the loop covers all seats)

FM Systems: Strengths and Limits

FM systems broadcast audio over a radio frequency, usually in the 72-76 MHz band reserved by the FCC for assistive listening in the United States. A transmitter connected to a microphone or PA system broadcasts the signal. Users wear a small receiver tuned to the same frequency and listen through earphones or a neck loop.

FM is the most widely deployed assistive listening technology in US schools and houses of worship. It is simple to set up, works without installation, and covers large areas reliably.

Where FM systems work well

• K-12 classrooms and school gyms where a portable transmitter is practical
• Houses of worship where the PA system can feed a direct audio line to the FM transmitter
• Open-air venues, outdoor amphitheaters, and sports facilities where infrared would fail
• Venues that need a portable, installable solution without a contractor
• Multi-building campuses where one transmitter can serve a large outdoor area

Limitations to plan around

• FM signals pass through walls, so adjacent rooms using the same frequency will interfere with each other
• Not suitable for courtrooms, medical consultations, or any space where audio must stay within the room
• Requires users to wear and return a dedicated receiver
• Frequency coordination is needed in buildings with multiple FM systems running simultaneously
• Older analog FM systems can pick up radio interference; newer digital FM and RF systems reduce this

Infrared Systems: Strengths and Limits

Infrared systems convert audio into invisible light waves in the infrared spectrum. A transmitter panel mounted on a wall or ceiling broadcasts the signal throughout the room. Users wear a receiver that contains a photodetector, which captures the light and converts it back to sound.

Because light does not pass through walls, infrared systems stay completely contained within the room where the transmitter is installed. This makes them the standard choice for courtrooms, medical facilities, and theaters where audio privacy is required.

Where infrared systems work well

• Courtrooms and legal proceedings where audio must not leave the room
• Theaters and cinemas with multiple screening rooms playing different content simultaneously
• Medical consultation rooms and psychiatric facilities
• Classrooms where audio privacy from adjacent rooms is required
• Conference rooms used for sensitive business discussions

Limitations to plan around

• Infrared signals are blocked by direct sunlight, making the system unusable outdoors or in rooms with strong natural light
• The receiver must have line of sight to the transmitter panel; people seated behind columns or in alcoves may lose signal
• Multiple transmitter panels may be required in large or irregularly shaped rooms
• Requires professional installation of transmitter panels; not easily portable
• Users must wear and return dedicated receivers, like FM

Bluetooth: What It Does and What It Cannot Do

Bluetooth is a short-range digital radio protocol widely used for wireless audio between personal devices, such as smartphones and headphones. In assistive listening, Bluetooth is increasingly used in two ways: as a personal streaming link between a hearing aid and a smartphone or TV, and as a technology being tested for venue-wide assistive listening through emerging standards like Auracast.

It is important to understand what Bluetooth currently can and cannot do in an ADA context.

What Bluetooth does well today

• Streams audio from a TV, tablet, or phone directly to a compatible hearing aid or personal receiver
• Useful for personal TV listening at home without disturbing others
• No infrastructure required; works with existing consumer devices
• Low barrier for individuals who already own Bluetooth-enabled hearing aids

What Bluetooth cannot currently do for ADA compliance

• Bluetooth is not listed as a recognized system type under ADA Section 706 or the U.S. Access Board advisory for ALS. A Bluetooth-only system does not satisfy the ADA assistive listening requirement in covered assembly areas
• Standard Bluetooth has latency (audio delay) that makes it poorly suited for live speech in lecture halls and worship spaces; the audio lags behind the speaker's lips
• Bluetooth range is limited; it typically covers only a few meters reliably, not a full auditorium
• Requires users to connect their personal device via pairing, which adds complexity for venues managing shared receivers
• Receivers still need a standard 3.5 mm mono jack under ADA Section 706.2; most Bluetooth receivers do not have this

A note on Auracast: Bluetooth Auracast is an emerging broadcast technology that may eventually be proposed as a venue-level assistive listening solution. As of 2026, it is not listed in the 2010 ADA Standards or U.S. Access Board guidance as a recognized compliant system type. Venues should not rely on it as their sole ADA solution until official guidance is updated. The Center for Hearing Access includes Auracast in its educational resources as a technology to watch, but notes it exists alongside, not instead of, current ADA-recognized systems.

Side-by-Side Comparison

What the ADA Says About System Type

The 2010 ADA Standards do not mandate a specific system type. Advisory 706.1 from the U.S. Access Board states that assistive listening systems are generally categorized by their mode of transmission, and lists induction loop, infrared, FM radio, and hard-wired systems as the recognized categories. Each has advantages and disadvantages suited to different applications.

What the ADA does mandate is performance: the system, whatever its type, must meet the technical thresholds in Section 706. These include a minimum sound pressure level of 110 dB SPL (max 118 dB SPL), a 50 dB dynamic range on the volume control, a signal-to-noise ratio for internally generated noise of at least 18 dB, and peak clipping not to exceed 18 dB. Every receiver must have a standard 3.5 mm mono jack. At least 25% of receivers must be hearing-aid compatible via a neck loop.

A venue may choose any recognized system type, but it must meet all of those performance standards. A system that costs less but delivers garbled, low-volume, or interference-heavy audio does not satisfy the ADA even if the receiver count is correct.

How to Choose: Decision Guide by Setting

The right system type depends on four things: the physical space, whether audio must stay private, who the users are and what hearing technology they use, and whether portability matters. Use this guide to narrow the decision.

Choose a hearing loop if:

• A significant share of your audience wears T-coil equipped hearing aids
• You want to eliminate the receiver lending, tracking, and cleaning burden
• The space is a permanent venue (theater, worship space, service counter) where installation is feasible
• You want to take advantage of ADA Exception 2 and reduce the hearing-aid compatible receiver count

Choose an FM system if:

• The space is a school classroom, gymnasium, or outdoor area
• You need portability - the transmitter can move from room to room
• Audio privacy between rooms is not a concern
• Budget is a factor; FM systems tend to cost less than installed loop or IR systems

Choose an infrared system if:

• The space is a courtroom, cinema, medical facility, or confidential meeting room
• Multiple spaces are located side by side and audio must not cross between them
• The room is enclosed with no direct sunlight exposure
• Audio privacy is a compliance or legal requirement, not just a preference

Use Bluetooth as a supplement, not a replacement, if:

• Users are connecting personal devices for TV or phone audio at home
• A Bluetooth-equipped hearing aid provides direct streaming from a paired device
• A venue already has a compliant FM, IR, or loop system and wants to offer Bluetooth as an additional option

How Bellman Products Connect to Each System Type

Bellman's personal listening devices are not FM transmitters, hearing loops, or infrared systems. They are personal amplifiers and wireless listening systems designed for individual use in any environment, including environments that already have a venue-installed ALS. Here is how they relate to each system type.

Hearing loop: Mino and Maxi Classic

The Bellman Mino Amplifier has a built-in Telecoil. In any venue with an installed hearing loop, a Mino user can switch to Telecoil mode and receive the loop signal directly, just as a hearing aid user would. No separate loop receiver is needed. The Mino also has dual microphones (omnidirectional and directional) for use in non-loop environments, and provides up to 30 hours of battery per charge.

The Maxi Classic personal amplifier also includes a built-in Telecoil, making it compatible with hearing loop venues in the same way. It is designed for straightforward operation with large, tactile controls.

Both devices are personal sound amplification products (PSAPs). They are not hearing aids and do not treat, correct, or diagnose hearing loss.

FM and infrared venues: Domino Pro with neck loop

The Bellman Domino Pro Wireless Listening System is a two-piece digital wireless system. In a setting that does not have any installed ALS, the Domino Pro functions as its own personal wireless listening system: the teacher, speaker, or conversation partner wears or places the transmitter, and the listener wears the receiver.

For users who also attend venues with FM or infrared systems and who use a T-coil hearing aid, the Domino Pro's 3.5 mm headset jack accepts a compatible neck loop (BE9159), allowing direct delivery of the receiver's audio to the hearing aid. This makes the Domino Pro useful across personal and venue-based listening situations.

The Domino Pro is not a hearing aid and is not intended to treat, correct, or diagnose any medical condition. It is a personal listening system for people who want clearer speech in everyday environments.

For guidance on how the Domino Pro fits into specific group settings such as classrooms, lectures, and tours, see: Bellman Domino Pro for lectures, tours and group settings.

People Also Ask

Written by

The Bellman Team

The Bellman editorial team produces content grounded in verified primary sources and informed by decades of experience designing listening and alerting solutions for the deaf and hard of hearing community. Our work draws on direct reading of the 2010 ADA Standards, U.S. Access Board advisory guidance, and resources from the Center for Hearing Access and HLAA. We do not cite secondary interpretations as fact where primary source documents are available.

Sources used in this article:

• 2010 ADA Standards for Accessible Design - Section 219 and Section 706 - ada.gov/law-and-regs/design-standards/2010-stds
• U.S. Access Board - Chapter 7: Communication Elements, Advisory 706.1 General (Assistive Listening Systems) - access-board.gov/ada/chapter/ch07
• U.S. Access Board - Assistive Listening Systems Technical Bulletin - access-board.gov/ada/guides/chapter7-assistive-listening-systems
• Center for Hearing Access - ADA Standards for Assistive Listening Systems (includes Auracast overview) - centerforhearingaccess.org/ada-standards
• Hearing Loss Association of America (HLAA) - Assistive Listening Devices & Systems - hearingloss.org/hearing-help/treatment-options/assistive-listening
• National Institute on Deafness and Other Communication Disorders (NIDCD) - Assistive Devices for People with Hearing, Voice, Speech, or Language Disorders - nidcd.nih.gov/health/assistive-devices
• Bellman & Symfon - Product Documentation: Domino Pro, Mino Amplifier - us.bellman.com/products/domino-pro / us.bellman.com/products/mino

This article is for informational purposes only and does not constitute legal advice. Consult a qualified ADA accessibility professional or attorney for guidance specific to your venue, jurisdiction, and compliance obligations.