What is the effect on sound pressure level when moving to double the distance from a sound source?

When you move to double the distance from a sound source, the sound pressure level decreases due to the inverse square law, which states that sound intensity diminishes over distance. Specifically, for a point source, when the distance from the source is doubled, the sound pressure level typically decreases by about 6 dB. However, it is essential to clarify that a common misunderstanding arises because sound pressure is related to intensity, which decreases more significantly than mere distance.

The calculation of a 6 dB reduction is based on the intensity of the sound, which relates to the square of the distance. Each doubling of the distance from a sound source results in a decrease of 6 dB. Since the question is about sound pressure level and its relationship with distance from the source, the overall understanding must take into account how sound intensity converts to sound pressure.

In practical audio scenarios, moving to double the distance will have a marked effect, leading to that decrease in pressure level. Furthermore, misconceptions might lead someone to believe it’s a 3 dB decrease, which is usually associated with halving the distance, not doubling it. Therefore, the correct interpretation aligns with the understanding that moving away from the sound source leads to a sound pressure level decreasing by approximately