I'm curious if any of the many headphone users have noticed their ears ringing more after a few hours. I've had some very mild tinnitus for years, so am always careful about volume levels. Yet, even while keeping the volume pretty low with games/music I've felt a pronounced increase in the ringing that continues long after I stop using my headphones. As much as I like them, I think I'm going to have to return my DT 990 and stick with speakers.