On Wed, 6 Dec 2023 11:57:05 +0100
Didier Kryn <kryn@???> wrote:

>     More seriously, when I was working at CERN, where many
> electronics racks are used with very noisy fans, a study was
> published which showed that you become deaf to certain frequencies
> emitted by the fans but you recover audition capability if you stop
> being exposed to these frequencies for some time. I think mostly very
> high power noise or music, and of course ageing, can cause permanent
> audidion loss.

I wonder if that's more a brain thing than an ear thing.