Hi Imayo, thank you so much for your reply, you have a lot of interesting suggestions.

I now realize that I left out an important piece of information: my husband tells me almost every time he speaks too loudly that he doesn't realize he's speaking loudly, and that he forgets to try to adjust the volume of his voice. He has mild cognitive impairment that may be progressing to some form of dementia, and possibly because of that, (another) new behavior has developed, and that is that he lies quiet frequently, so I don't know if I can believe what he says.

I love how logical all the experiments you suggest are, but I don't think he can remember enough to have these experiments really work. Also, his inappropriate speaking volume is rather random, and happens all throughout the day, so even if his hearing aid battery is getting low that wouldn't explain that this happens all day (his hearing aid batteries are recharged every night).

I'm sorry if I should've disclosed the mild cognitive impairment before, but I guess I didn't want to cloud the issue, and hoped to find out what could be going on for people with hearing impairments who may speak in inappropriate volumes. I think you've enlightened me about how hearing impairment is a journey, and as I've said before, I am sorry for anyone who has hearing impairment.

I am now apologizing to this community if I was wrong to avoid disclosing the mild cognitive impairment issue. I really do appreciate everyone's input, and all of it has been very useful to me. Because of a number of behaviors that have been developing recently and what his doctors have to say about these behaviors, I now think it is possible that he may not be lying when he says he forgets to adjust his speaking volume. Again, my sincere apologies to this community if I took up your time when maybe a lot of this is an issue for a different community, like caregivers of people with dementia.

Thank you for your input!