Adding sound powers yields identical totals for correlated and uncorrelated sources

Evidence

How does the addition of sources affect the sound pressure level (SPL), the sound power level (SWL) and the sound intensity level (SIL)? For the SWL and SIL, because we are adding powers, the results will be the same whether the sources are correlated or not. However, for SPL, there will be a difference between the correlated and uncorrelated results. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 275

Categorization

• DEFINE: Clarifies the crucial distinction between power-level sums (source-independent) and pressure-level sums (source-correlation-dependent).
• corroborated: 2 independent passages support this claim — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 275