Quote: Where is ear level measured? Just with a mic in free space? What's the difference in dB between ear level and in ear measurements, aside from gain above 1 kHz and so on due to the pinna and so on? What's the difference in levels? My guess would be that something narrowband with X dB SPL total could be more damaging than something broadband with X dB SPL total, and so on. Is that right? All I know is that A weighting is kind of abused in a lot of contexts. It probably doesn't mean too much useful at higher levels, for music-like sounds.