‘Logarithmic’ is a mathematical concept, and is the inverse of exponential.

The logarithm of a number is the number by which the original number must be raised to reach the resultant number, which has an exponential relationship to the original number.

In acoustics, a decibel is a logarithmic unit that measures the level, power, or “loudness” of a sound. Logarithmic units are related by successive equal ratios from point to point. 

The significance of a logarithm in the sound and audio world is that the dynamics of human hearing can most effectively be mapped out as and described with a logarithmic scale.

graphic of a logarithmic decibel hearing curve
image courtesy of prostudiolive.com
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