| 11. | The design process starts by entering the dimensions of the room and the required sound pressure level.
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| 12. | Sirens generate low frequencies, but with high sound pressure levels distortion appears that leads to higher harmonics.
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| 13. | The glossary in the file does have an entry for " sound pressure level ", which is
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| 14. | From an acoustics class I took, I remembered there were sound pressure levels, maybe unweighted or using A-weighting.
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| 15. | Additionally, discharge of firearms in indoor ranges can produce noise levels of over 140 dB sound pressure level.
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| 16. | :Go to Radio Shack or whatever your local electronics store is and pick up a sound pressure level meter.
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| 17. | Statistically significant health effects did however start as early as from an average sound pressure level of 40 decibel.
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| 18. | Else, how would you know the sound pressure level ? talk ) 20 : 59, 7 April 2009 ( UTC)
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| 19. | Other shortcomings include very limited sound pressure levels, meaning that it won't play loud, and its bass response was lacking.
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| 20. | Subwoofers also vary in regard to the sound pressure levels achievable and the distortion levels they can produce over their range.
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