What is Inverse Square Law (Sound)?
Sound Pressure Level (SPL) drop.
How it Works
L2 = L1 - 20 * log10(r2/r1).
Step-by-Step Guide
- 1 L1
- Source dB.
- 2 Distances
- Start/End.
- 3 L2
- New dB.
Example
Input: 100dB @ 1m -> 2m
Result: 94 dB
FAQ
Indoors?
Reverb reduces drop.
Line array?
Drops 3dB (cylindrical).
Conclusion
Sound drops by 6 dB for every doubling of distance in a free field.