Development and Evaluation of a Loudness Validation Method With Natural Signals for Hearing Aid Fitting.
Mats Exter, Theresa Jansen, Laura Hartog and 1 others
PMID 39632774WHAT IT FOUND
The new loudness validation method quickly identifies where hearing aid gains are too low or too high.
It revealed that standard first fits often leave soft sounds too quiet while making loud sounds uncomfortably loud. Fine-tuning reduced loudness overall but did not fully correct these imbalances.
Key findings
01The method uses natural sounds to avoid errors caused by hearing aid compression algorithms reacting to artificial test tones.
02Hearing aid users with their own devices showed a shift toward softer loudness perception compared to their first fit, suggesting gain was reduced during fine-tuning.
03A complete measurement run takes an average of five minutes and thirty-six seconds.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study did not test whether using the LVM leads to better patient outcomes or satisfaction, only that it produces interpretable data. The reference values were derived from a relatively small group of 33 normal-hearing adults. The method may be influenced by hearing aid algorithms with long adaptation times that are not addressed by the stimulus ramps. The evaluation focused on a specific group of hearing-impaired adults with symmetrical hearing loss, so it may not apply to those with unilateral loss or other audiometric configurations.
Declared interests
The study was supported by the German Bundesministerium für Wirtschaft und Klimaschutz and the Deutsche Forschungsgemeinschaft. The authors did not declare any commercial conflicts of interest, but the method was developed in-house at their institution.
The easy way to misread this
Do not assume that reducing overall gain to fix excessive loudness is a correct solution. The study showed that fine-tuning often shifts perception to softer levels, which may leave soft sounds too quiet. The goal should be to correct the specific imbalance, not just lower the volume.