## Notes
The calculations are for the point source model of sound propagation (6dB per doubling of
distance). For sources of significant size, sound pressure levels must be input at
source-to-receiver distances large enough to be sufficiently in the **far-field**,
where inherent directivity is minimal. For a broadband source, this is where the distance is
greater than the longest dimension of the source.
The calculations are based on **free-field** conditions, where there is no reverberant
field.
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