When there are multiple uncorrelated sound sources, the total power emitted is the sum of the power from each source.
Question: By how much would the sound level increase when two (uncorrelated) sources sound simultaneously with equal power?
Solution: The sound power (at the source) would double and thus,
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Similarly, there would be a 3 dB increase in the sound intensity level measured at some distance away from the source.
This is the case most of the time. However, there is an exception...