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@DebInAustralia: So to get the brain to turn down the gain, maybe listening to loud (as loud as you can but not uncomfortable) music through...
Further to my comment yesterday, I have a conjecture (100% pure speculation) that the hissing in my ears after the the use of the noise cancelling...
This past week or so, I've started to notice that I have a high pitched hiss in both my ears. About a month ago, I git a pair of Bose noise...