My ears ring all the time. Moreso when I've been in loud situations. I regularly go to an audiologist and have my hearing checked. Frequency response is still top of the charts thankfully. As such, I always have at least one pair of earplugs with me and wear them at all rehearsals and gigs. I also wear them on the road as they tune out excessive road noise. (Though I can still hear sirens and such!) If ambient noise in the office gets to be too much, in go the earplugs.