SPL Over Distance Calculator
This calculator finds the sound pressure level at a new distance from a known reference, using the free-field inverse-square law: the level drops 20 times the log of the distance ratio, in decibels, as you move away. Enter a reference SPL, the distance it was measured at, and your target distance. Real rooms run a little hotter at distance because of reflections, so treat the result as a free-field baseline.
This runs on the same engine as the agents
On the calculator the math stands alone. Inside Avria it runs across a whole room, cites the clause behind every call, and lands in a build-ready BOM.
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