The Next Generation
Fitting System

NAL-NL3 is the next generation of hearing aid fitting prescription developed by the National Acoustic Laboratories (NAL). Building on decades of audiological research, NAL-NL3 delivers a more accurate, data-driven, and patient-centred approach to hearing aid and hearing device fittings designed to meet the complex and evolving needs of hearing aid users today.

How NAL-NL3 Works

Machine Learning & Neural Networks

Millions of historical hearing aid fittings are analysed using advanced machine learning to understand optimal amplification patterns.

Data from hundreds of thousands of hearing aid fittings

Informed by decades of clinical expertise and extensive real-world use, the NAL-NL3 fitting system is designed to support the full spectrum of hearing needs, from common presentations to more complex configurations. This breadth ensures reliable performance across diverse users and listening situations.

Engineered by NAL, Backed by Evidence

Developed and validated by NAL, with every module grounded in evidence and tested using real-world clinical data.

Filling the Gaps in Hearing Care

NAL-NL3 resolves everyday clinical challenges, enabling more precise and effective fittings. It also provides manufacturers with a flexible, future-ready foundation that integrates seamlessly across platforms.

Our Key Features

Delivering more accurate fitting targets, NAL-NL3 enhances precision across all types of hearing loss, including complex configurations.

More Accurate Fitting Targets

Improved precision across the full spectrum of hearing loss types, including challenging configurations like reverse-slope and mixed losses.

Built-in Flexibility with Modules

NAL-NL3 introduces specialised fitting modules that allow hearing care professionals to better match amplification to user needs

Seamless Broad Compatibility

Engineered for seamless integration across industry-standard platforms, with Android and iOS support coming soon.

The NAL-NL3 fitting system is a modular framework that combines NAL-NL3 Prescription, which provides a general prescription for most situations, with specialised NAL-NL3 Modules designed to address specific listening needs. This structure allows the system to adapt flexibly while maintaining consistent, evidence-based performance.


Current Modules

More modules coming soon

NAL-NL3 Minimal Hearing Loss Module

Designed for people with normal or near normal hearing who experience difficulty understanding speech in noisy or challenging situations. This module goes beyond traditional prescription methods to address the needs of an under-served population.

NAL-NL3 Comfort in Noise Module

Enables improved listening comfort in noisy and demanding environments while maintaining speech intelligibility. This feature can be included as a separate program within hearing aids to offer users additional support during challenging listening situations.

A Legacy of Research and Innovation

For more than 50 years, the National Acoustic Laboratories have led the development of evidence-based hearing aid fitting prescriptions. Each generation has advanced hearing care by responding to emerging evidence and real-world experience. The NAL-NL3 fitting system represents the next stage of this evolution, shaped by a shift towards a modular approach to address specific unmet needs in hearing care. By moving beyond a single general prescription, NAL-NL3 enables targeted solutions that extend fitting support to new client segments and listening needs.

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Introduced fitting strategies that used loudness equalisation and enhanced speech intelligibility to guide the adjustment of nonlinear hearing aids.

Incorporated user specific variables such as gender, language, hearing aid experience, and the acoustic characteristics of tonal versus non tonal languages.

Powered by machine learning, large-scale data, and real-world user input for the most personalised and precise fitting formula yet.

Why NAL-NL3?

Personalised Hearing for Every User

NAL-NL3 moves beyond generic fitting approaches, offering truly individualised amplification. By analysing millions of real-world fittings and integrating user feedback, it ensures each hearing aid is optimally tuned to the unique hearing needs of the individual.

Better Performance in Real-World Situations

With modules for minimal hearing loss and noisy environments, NAL-NL3 helps users hear clearly and comfortably in challenging situations like restaurants, pubs, or social gatherings. This focus on real-world listening makes daily life more enjoyable and less stressful.

A Future Ready, Evidence-based Fitting System

The NAL-NL3 fitting system is a trusted, evidence-based solution designed to evolve over time. Its modular structure supports new user groups and emerging needs, providing long-term value beyond the capabilities of traditional fitting prescriptions.

What people are saying

NAL-NL3 Publications

May-2025

The new NAL-NL3 hearing aid fitting formula: An evolution and a revolution

Those behind the first new hearing aid fitting formula in 15 years, the National Acoustic Laboratories’ NAL-NL3, discuss everything audiologists

Apr-2025

New NAL-NL3 System Aims to Fill Gaps in Hearing Care for Under-Served Populations

The National Acoustic Laboratories (NAL), a global leader in hearing research, has announced the launch of its next-generation hearing aid

Mar-2025

Groundbreaking NAL-NL3 fitting formula reveals new ways of fitting hearing aids

The National Acoustic Laboratories’ long-awaited NAL-NL3 hearing aid fitting prescription formula was revealed today at the American Academy of Audiology

NAL-NL3 in the News

Nov-2025

NAL-NL3 Now Available in MedRx Verification and Test System

National Acoustic Laboratories (NAL) is pleased to announce that the NAL-NL3 fitting system is now integrated into MedRx Studio Software

Nov-2025

October 2025: NAL-NL3 was presented at EUHA, Germany

In October 2025, NAL-NL3 was presented at the European Union of Hearing Aid Acousticians Congress in Germany. 

Oct-2025

NAL-NL3 was presented at FIA Congress, Italy

NAL-Nl3 was presented at the FIA Congress in Italy, a respected international forum for hearing care professionals and industry leaders. 

Take the Next Step with NAL-NL3

For clinicians, researchers, and manufacturers who want to deliver world-class hearing solutions.

NAL’s mission is to lead the world in hearing research and evidence-based innovation to improve hearing health and transform the lives of people with hearing difficulties. NAL’s team of world-class researchers and innovators focus on projects that deliver impact – centering the customer and their unmet needs through truly translational research.