Loudness and addition of decibels


Because of the logarithmic scale, decibels do not add in a linear fashion. When two identical sounds occur simultaneously, the resulting level is only 3 dB higher than for a single source. By contrast, an increase of 10 dB normally represents a doubling of “loudness” of the sound. Hence doubling the amount of sound energy results in very much less than a doubling in subjective loudness –

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