Hearing level is the sound pressure level produced by an audiometer at a specific frequency. It is measured in decibels with reference to audiometric zero.[1] Hearing of speech is considered to be impaired when the hearing level is shifted 25 dB or more.[2]

References

  1. ↑ "The Audiogram" (PDF). VanAsh Deaf Education Center. Archived from the original (PDF) on 27 February 2012. Retrieved 16 December 2012.
  2. ↑ Truax, Barry. "Hearing level". Handbook for acoustic ecology. SFA. Archived from the original on 28 November 2012. Retrieved 16 December 2012.
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