> ^ If ear protection does not work, it must be in her head.
> Explain how that cannot be so.  High pitched audio is
> blocked by ear protection.

Yes, exactly, I've explained to her that treble noise is quite
easily attenuated, so that seems to have been at least partly
ruled out, although she is adamant she can hear "something".
I'm just as curious and eager as she is to get to the bottom
of it because it's causing her some distress

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