> I have this too. My theory is the random "drops" are caused by the inner ear hairs attuned to that frequency get disturbed by something (like a shift in fluid

> I have this too. My theory is the random "drops" are caused by the inner ear hairs attuned to that frequency get disturbed by something (like a shift in fluid) and overloading their respective nerves, similar to the afterimages that come from staring at a bright light. Interesting theory. Yeah, for me, it often happens when I'm sitting still working. I have never noticed it in response to sound. But, yeah, I can imagine it being some innocuous physical thing in the fluid. > The low level tinitus in a quiet room seems pretty normal to me, it's your brain looking for really quiet noises that are at the limit of what your ears can pick up. Or something, I'm no expert on it. Yeah, might be somewhat like the hum when the gain is turned up on a guitar amp and nothing's playing. Basically just amplifying the noise floor. I'm not sure if it's true tinnitus, or just my brain filling in for the white noise I normally have in the background.