Well, I've noticed in winter riding, a balacava pulled over the ears lets me use the hearing aid. Maybe it's not the wind per se, but turbulance.

On the sound meter; it might be a good test. I'm not sure about this. Microphones don't handle wind well. If you've ever heard someone testing a mic by blowing into it, you know it amplifies differently than speech. I respect Slovid's work, but I'm not completely sure all the variables have been covered. What I'm getting at is that the high of 112 is quite loud, and there might have been a noise reduction all out of proportion to the thickness of a thin windscreen.

I don't think I'm saying this very well, but I'm pretty sure I understand what I mean.