Sorry, I'm missing something here, not sure what is being claimed (especially since a number of different aspects are being discussed in the thread). It seems like this implies that I could easily make out exactly what is being shouted from 1.2 miles away (of course, assuming no wind, line of sight). After all, I can listen to music at a moderate level, turn it down 60 dB, and still make out every word of the lyrics without effort, even in the midst of music. But I somehow doubt I could do the same with someone 1.2 miles away, even under the most ideal fo circumstances—can't say for sure, never tried it, I just doubt it. But it seems like that is the purpose of the claim, to show what a reduction of 60 dB implies.