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Design Example: Vintage Mixing Console01:17

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A sound engineer at a music company recently encountered a problem. The output from their newly acquired studio's vintage mixing console was too low for the requirements of modern recording equipment. To rectify this situation, the engineer decided to design an audio pre-amplifier using an operational amplifier (op-amp) to boost the signal level.
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Updated: Mar 18, 2026

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Sweet-Spot Compression: An Amplification Strategy for Improving Listening Outcomes at Moderate to High Levels.

Lukas Jürgensen1,2, Michal Fereczkowski1,2, Tobias Neher1,2

  • 1Department of Clinical Research, University of Southern Denmark, Odense, Denmark.

Trends in Hearing
|March 17, 2026
PubMed
Summary

Sweet-spot compression (SSC) improves speech intelligibility and comfort for hearing aid users experiencing speech level-dependent intelligibility decline, known as rollover. This amplification strategy shows promise for better listening outcomes at moderate to high sound levels.

Keywords:
gain prescriptionhearing aidsmost comfortable levelrolloverspeech intelligibility

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Area of Science:

  • Audiology
  • Hearing Science
  • Speech Processing

Background:

  • Speech intelligibility can decrease at higher sound levels, a phenomenon called rollover, which is often overlooked in hearing aid fitting.
  • Sweet-spot compression (SSC) is an amplification strategy designed to counteract rollover and enhance speech perception at moderate to high levels.
  • Previous research demonstrated SSC's effectiveness using a hearing aid simulator.

Purpose of the Study:

  • To investigate individual differences in most comfortable speech level (MCL) and speech intelligibility in noise at moderate to high levels.
  • To further evaluate the listening outcomes of SSC using a wearable research hearing aid.
  • To assess the efficacy of SSC in mitigating speech intelligibility rollover.

Main Methods:

  • Tested 18 participants with mild to moderate hearing loss using a wearable research hearing aid.
  • Mapped individual differences in MCL and speech intelligibility in quiet and noise with linear amplification.
  • Compared listening outcomes between SSC and a clinical reference condition.

Main Results:

  • Significant individual variations in MCL and speech intelligibility were observed with linear amplification.
  • SSC resulted in superior speech intelligibility and was preferred by participants in both quiet and noisy conditions compared to the reference.
  • Rollover was less prevalent at the individual level with SSC than with the reference condition, and did not occur at the group level for either condition.

Conclusions:

  • SSC demonstrates potential for improving hearing aid fittings by enhancing speech intelligibility and user preference at moderate to high sound levels.
  • Addressing individual differences in speech perception is crucial for optimizing hearing aid performance.
  • SSC offers a promising approach to mitigate the negative effects of speech intelligibility rollover.