And for me, a 1dB difference was reliably detectable, so I would go by the 1dB figure if their recordings were correct (dB and not dBV or dBA). Anyway, mainly I meant that one can hear power levels at the speaker a lot less than 125mW. Of course it all depends too on background noise in the room environment, the speaker, etc. as 125mW in a car going down the road won't get you far!
And if you want to get depressed (or impressed) by how much hearing loss you have or don't have: