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  1. The name given to a law of physics which states "for each doubling of distance a sound wave travels along a path, the level of sound will drop to 1/4th (the inverse of the square of the distance)". Doubling the distance reduces the sound pressure level (SPL) by 6dB. Source: Church Audio & Acoustics Glossary
  2. Under far field/free field conditions, sound intensity varies inversely with the square of the distance from the source. In pure spherical divergence of sound from a point source in free space, the sound pressure level decreases 6 dB for each doubling of the distance. Source: http://www.owenscorning.com/around/sound/glossary.asp

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