I'm interested that so many of you hear a low hum. I have reverse slope hearing -- (I can hear women's voices better than men's - bird song but not thunder etc) and I thought that was why I hear low frequency tinnitus -- a hum, sometimes more like a roar. It seems most people with regular hearing loss in the high frequencies, hear a ringing sound. A theory supporting this tinnitus is the brain is trying to make up for the hearing loss creating a phantom sound.