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 pressure level increases by 3dB(A), the pressure level doubles. When the sound level decreases by 3dB(A), the pressure level halves.
 
http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2000:162:0001:0078:EN:PDF

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