For the past week, I've had a new sound - an extremely deep bass rumbling sound that I hear in response to other sounds. If I hear any "whoosh" kind of sound (fan, water running hard at the faucet, washing machine on, etc.) then I hear this super-deep bass rumbling, as though a motorcycle is idling outside, or a jet is flying overhead. Last night the air conditioner was on when I went to bed, and the whoosing noise of that was setting off this deep bass sound. It actually seemed like I was even feeling the vibration of the deep sound. As an experiement, I put foam earplugs in, and the deep bass sound vanished. It also vanished when the air conditioner went off. The deep bass sound was in a "whump whump whump" pattern, with a pause before starting up again. Any thoughts as to what this type of tinnitus is? Anyone else have this?