What sound frequencies can pass through a hole in a wall?

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SUMMARY

The forum discussion centers on the transmission of sound frequencies through a hole in a wall, specifically analyzing how diameter and length affect sound propagation. Key parameters include a sound frequency range of 200Hz to 5000Hz, a hole diameter ranging from 1mm to 10cm, and a length from 1cm to 10cm. Participants emphasize that the relationship between hole dimensions and sound transmission is complex, involving concepts like harmonic combs and impedance mismatches. The discussion concludes that the effective transmission of sound is influenced by the ratio of hole dimensions to wavelength, with specific calculations provided for energy transmission coefficients.

PREREQUISITES
  • Understanding of sound wave properties, including longitudinal waves and frequency ranges.
  • Familiarity with acoustic principles, particularly the concepts of impedance and transmission coefficients.
  • Knowledge of harmonic theory and resonant frequencies in acoustics.
  • Basic grasp of sound pressure levels (SPL) and their impact on sound transmission.
NEXT STEPS
  • Research "acoustic transfer function of an orifice plate" to understand sound transmission through apertures.
  • Explore "Helmholtz resonators" and their role in sound propagation through small openings.
  • Study "sound wave diffraction" and its effects on sound transmission through various hole sizes.
  • Investigate "energy transmission coefficients" in acoustics for practical applications in soundproofing.
USEFUL FOR

Acoustic engineers, sound designers, and anyone involved in soundproofing or audio equipment design will benefit from this discussion, particularly those interested in the effects of physical barriers on sound transmission.

  • #31
S P said:
I am not a troll. The task I am solving sounds exactly like that
No. Not at all. Your basic problem is almost universal for building design.

Thing is, you would be far better off doing a Google search to find more precisely what you need. My first Google hit was this link which provides "some kind of formula". There were many others and I suggest you go down the same path.
When you find something that looks the right level, ask PF again to clear up particular problems. you find there. Otherwise, it can turn out to be too open ended for PF to help.
 
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  • #32
I am very new here....and yet I found the question interesting. I have been wondering the same thing myself. Another approach to the problem might be to ask, "what theories come into play" with this problem? If we knew the major theories involved, we should be able to learn and solve the problem on our own. Please don't give up on the question, keep it very simple - at the theoretical level. Thanks you, Rob
 

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