According to the European standards:
LWA95 = 70dB(A) at 7m
LWA97 = 72dB(A) at 7m
 
We could say that:
dB(A) at 7m = LWA-25
dB(A) at 4m = LWA-20
dB(A) at 0m = LWA-0 = LWA
 
To convert the sound power LWA into the theoretical average sound pressure level dB(A), we use a helpful table.
 
Attention: when the sound level increases by 3dB(A), the sound perceived by the human ear is doubled. When the sound level decreases by 3dB(A), the sound perceived by the human ear is halved.
 
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2000:162:0001:0078:EN:PDF

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