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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 regular (non-NC) headphones might be a way to tell the brain that the sound environment is actually not that deadened, the auditory cortex can adjust the...

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 earbuds (Bose QC20) is due to a--for lack of a better word--"panic" response by the auditory system. With the noise cancelling on, the dead silence...

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 canceling headphones (the model with the silicone buds in the ears), and while I cannot prove it, I have the sense that using them might have something to...