I wear hearing aids that amplify everything except the human voice. I can hear an ant fart at 40 yards but I can't hear my wife sitting next to me. And it's not Selective Hearing. My hearing is actually still very good but she insisted that I get them so I could hear her. Didn't work. When in the shop, I don't wear anything to protect my hearing. I did everything possible to ruin my hearing. I have tinnitis in both ears. But, I still hear very well. The hearing aids were a waste of $2800.