The voice level at various distances
Talking with a normal voice approximate to a sound pressure level of 70 dB, a raised voice to 76 dB, a very loud voice to 82 dB and a shouting voice to 88 dB (1 ft distance).
|Distance||Voice Level (dB)|
In social situations people often talk with normal voice levels at distances of 1 to 4 meters. In such cases the noise level should not exceed 55 to 60 dB(A).
In outdoor play and recreational areas, people often communicate with a raised or very loud voice at distances of 5 to 10 meters. In such cases background noise should not exceed 45 to 55 dB(A).