trueLOUDNESS
– The new quality of hearing system fitting
More clarity, less readjustment - trueLOUDNESS enables individual, fast and precise loudness adjustment with high initial acceptance, even in noisy environments.
Why standard procedures often fail
Fitting hearing systems is often a compromise between speech intelligibility and loudness. Standard procedures reach their limits as they are based on narrowband signals and therefore cannot reproduce the true auditory reality of your clients. The result: readjustments, frustration and dissatisfied users despite "suitable" audiograms.
trueLOUDNESS brings reality to the fitting process
trueLOUDNESS is the first fitting method that measures individual binaural and broadband loudness perception – exactly how speech, music and the environment sound in real life.
With a measurement in less than 10 minutes, you receive precise gain values for an initial fitting with high acceptance even in noisy environments.
Advantages at a glance
Individual initial fitting
Normalizes the binaural, broadband loudness perception.
Unique in the world
First method that takes binaural loudness summation into account.
Scientifically sound
Tested & validated in numerous studies.
More hearing comfort
High speech intelligibility even with quiet speech.
High initial acceptance
Even in noisy environments.
Time-saving
Measurement in just approx. 10 minutes with the A2000 free-field headphones.
Automated & individual
Offers automatic level selection & suitable compression settings.
Recognizes special features
Up to 20 dB gain difference visible – despite similar audiograms.
Start now!
Discover the available product versions of trueLOUDNESS
Select the optimum product version for your application and requirements and get in touch with the right contact person directly if you are interested.
🧩 Partner version
As a "partner version", you use trueLOUDNESS as an integrated module in an existing fitting system.
Currently exclusively for ACAM 5:
As our sales partner, Acousticon is offering trueLOUDNESS as a measurement module for its "ACAM 5" fitting system for the first time worldwide and exclusively.
Interested?
Then contact Acousticon Hörsysteme GmbH directly
+49 6162 9324-00
Recommended by your colleagues
Voices from the field
When I use trueLOUDNESS in combination with ALF, I need far fewer appointments for readjustments.
Cora Viesehon
The adjustment with trueLOUDNESS and revoloud is easy for employees to carry out and reproduce. It's all really good!
Matthias Meuser
Owner ・ Hörakustik Lindenthal
The initial setting with trueLOUDNESS leads to very good initial acceptance without having to reduce gain in the "wrong places".
Sven Winkler
Owner ・ Brillen Müller GmbH & Co. KG
More info
Product details
Basics of the procedure
In the video linked below, Dr. Dirk Oetting discusses the discovery of binaural broadband loudness summation, explains narrowband loudness equalization and uses examples to show how binaural broadband loudness summation affects the gain calculation.
Real insights into practice
This video series shows Sven Winkler – Managing Director of Brillen Müller (Wittlich) – with various fitting cases that can teach you a lot about individual hearing aid fitting. He himself has converted the hearing aid fitting in his stores to trueLOUDNESS.
System requirements
Operating system: Microsoft® Windows®
References
Oetting, D., Hohmann, V., Appell, J.-E., Kollmeier, B., Ewert, S. D. (2016) Spectral and binaural loudness summation in hearing-impaired listeners. Hearing Research 335, 179–192. DOI: 10.1016/j.heares.2016.03.010
Oetting, D., Ewert, S. D. (2017) Loudness summation of equal-loudness narrowband signals in listeners with normal hearing and hearing impairment, Int J Audol., 1–10 DOI: 10.1080/14992027.2017.1380848
Oetting, D., Hohmann, V., Appell, J.-E., Kollmeier, B., Ewert, S. D. (2018) Restoring perceived loudness for listeners with hearing loss. Ear and Hearing, 39(4), 664–678. DOI: 10.1097/AUD.0000000000000521
van Beurden, M., Boymans, M., van Geleuken, M., Oetting, D., Kollmeier, B., Dreschler, W. A. (2018). Potential Consequences of Spectral and Binaural Loudness Summation for Bilateral Hearing Aid Fitting. Trends in Hearing, 22, 2331216518805690. DOI: 10.1177/2331216518805690
van Beurden, M.; Boymans, M.; van Geleuken, M.; Oetting, D.; Kollmeier, B. & Dreschler, W. A. (2021) Uni- and bilateral spectral loudness summation and binaural loudness summation with loudness matching and categorical loudness scaling null, Taylor & Francis, 60, 350–358 DOI: 10.1080/14992027.2020.1832263
Denk, F., Oetting, D., Latzel, M., Bonsel, H., & Husstedt, H. (2025). Prevalence of excess binaural broadband loudness summation in the hearing-impaired population and implications for hearing aid gain targets. PLOS ONE, 20(8), e0330517. DOI: 10.1371/journal.pone.0330517
Zimmer J, Hartog L, Oetting D, Pöntynen H, Dietz M. Loudness and lateralization of binaural broadband noise in subjects with asymmetric hearing loss. GMS Z Audiol (Audiol Acoust). 2024;6:Doc10. DOI: 10.3205/zaud000045
Suck, L. C., Hartog, L., Ewert, S., Hohmann, V., & Oetting, D. (2020). Verkürzung der trueLOUDNESS-Anpassmethode zur binauralen breitbandigen Lautheitsnormalisierung in Hörgeräten. In: 23. Jahrestagung der Deutschen Gesellschaft für Audiologie (DGA), (PDF)
Oetting D, Rennebeck S, Wiercinski B, Schulte M. (2018) Binaurale breitbandige lautheitsbasierte Anpassung trueLOUDNESS im Vergleich zu NAL-NL2. In: 21. Jahrestagung der Deutschen Gesellschaft für Audiologie (DGA). (PDF)