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Free-field and Hemispherical Sound Propagation - Free-field and Hemispherical Sound Propagation
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Free-field and Hemispherical Sound Propagation - Free-field and Hemispherical Sound Propagation
When we talk about speaker measurements these terms often arise. The term free-field means that a sound source is in total open space. Nothing above, below or to the sides of it. In this total open space, the pressure level of the sound decreases by 6dB every time the distance from it doubles. That is because the area the sound energy has to fill gets bigger as we move further away from the source.
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