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Rog Mogale wrote: 2nd thing would be if the sound source were cylindrical or spherical.
3rd would be how large the radiation area of the sound source was.
So basically, if it’s louder to start with it will be louder at distance. If it’s a cylindrical radiation pattern then it would appear louder at a given distance over a spherical sound source, i.e. line array vs point source. And larger radiating areas are louder at a given distance because they behave more like cylindrical sources the larger they get.