Martin Audio W8L Longbow Application Manual page 85

venues. Sound will now travel slower near the ground and faster higher up causing its
path to be tilted downwards.
Air absorption
Many users believe that line array sound pressure levels drop by only 3dB per
doubling of distance and this belief can lead to over-optimistic predictions of line
array long-throw characteristics. Air absorption reduces high and mid frequencies
proportional to distance depending on relative humidity.
All material © 2007. Martin Audio Ltd. Subject to change without notice.