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Adding Decibels

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Decibels are logarithmic units and can't be added like other numbers. If you have one source producing a sound level of 65dB and you add a second 65dB sound source, you don't have a level of 130dB, you have a sound level of 68dB. This seems easy enough when both values are the same, but is much less obvious when the levels are different from each other. You will note that when the two levels are similar, the change in the combined level is larger than when the two levels are significantly different.

The level in dB of the first sound source.
dB

The level in dB of the second sound source
dB

The combined level of both sources
dB


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Mc Squared System Design Group, Inc Mc Squared System Design Group, Inc
323 - 901 West 3rd Street, North Vancouver, BC. V7P 3P9   Ph 604-986-8181
116-5100 Anderson Way, Vernon, BC V1T 0C4   Ph 604-986-8181