A noise line source generates sound that spreads cylindrically. This means that for every doubling of distance, the sound energy is spread across double the area and the sound intensity halves. Examples of line sources could include compressor pipes, a train or even a busy road to name a few.
Use the calculator below to calculate the attenuation of sound from a line source, using either metric or imperial units of distance (i.e. metres or feet).
See our popular inverse square law calculator to calculate the free-field attenuation of a point source.