Glossary Term

Decibel (dB)

Information on Decibel (dB) Last Updated: 11.08.07

Named after Alexander Graham Bell. We perceive differences in volume level in a logarithmic manner. Our ears become less sensitive to sound as its intensity increases. Decibels are a logarithmic scale of relative loudness. A difference of approx. 1 dB is the minimum perceptible change in volume, 3 dB is a moderate change in volume, and about 10 dB is an apparent doubling of volume.

 

    * 0 dB is the threshold of hearing, 130 dB is the threshold of pain.

    * Whisper: 15-25 dB

    * Quiet background: about 35 dB

    * Normal home or office background: 40-60 dB

    * Normal speaking voice: 65-70 dB

    * Orchestral climax: 105 dB

    * Live Rock music: 120 dB+

    * Jet aircraft: 140-180 dB

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