Room Sound Attenuation (Lp - LN) - (dB) :
The attenuation (Lp - LN) can also be estimated from the diagram below by modifying (2) to be expressed as the ratio between "distance r between source and receiver" and "square of the directivity coefficient D" - and the total room sound absorption in m2 Sabine.
For a room the acoustic property total room sound absorption is 1000 m2 Sabine. For a listener in the middle of the room with a directivity constant 1 and at distance 1 m from the sound source - the ratio
r / D1/2 = 1 / (1 m)1/2
From the diagram above the attenuation can estimated to approximately
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