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Related Experiment Videos

Reducing seat dip attenuation

Davies1, Cox

  • 1School of Acoustics and Electronic Engineering, Salford University, United Kingdom.

The Journal of the Acoustical Society of America
|December 7, 2000
PubMed
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Concert hall acoustics can be improved by addressing early sound reflections. Introducing a 1-meter pit under seats effectively reduces seat dip attenuation, making it inaudible.

Area of Science:

  • Acoustics
  • Architectural Acoustics
  • Psychoacoustics

Background:

  • The 'seat dip' is a common acoustic anomaly in concert halls, characterized by sound attenuation.
  • This dip occurs approximately 4 milliseconds after the direct sound arrives, significantly impacting listener experience.
  • Early sound reflections from seats and flooring are identified as the primary cause of seat dip attenuation.

Purpose of the Study:

  • To investigate strategies for reducing seat dip attenuation in concert halls.
  • To determine the effectiveness of modifying seat and floor characteristics on acoustic properties.
  • To identify methods for reducing early reflections to below the subjective threshold.

Main Methods:

  • Utilized a boundary element model to simulate acoustic interactions.

Related Experiment Videos

  • Employed a physical scale model to validate simulation results.
  • Tested modifications to seat shape, seat impedance, and floor structure, including the introduction of a 1-meter pit.

    • Main Results:

    • The study confirmed that early reflections from seats and floors are the main cause of the seat dip.
    • Introducing a 1-meter pit beneath the seats was found to render the seat dip effect inaudible.
    • Modifying the impedance of the seat squab yielded smaller, yet noticeable, improvements in reducing attenuation.

    Conclusions:

    • Controlling early sound reflections is crucial for mitigating seat dip attenuation in concert halls.
    • Architectural modifications, such as incorporating under-seat pits, offer a highly effective solution.
    • Further research into material properties, like seat squab impedance, can contribute to optimizing concert hall acoustics.