Trying to find how loud is the maximum level in an iPhone in db. Most of the times I have it below the middle, even 1/4 of the maximum. But sometimes, specially when running, I do increase the level up to 3/4. Me question is because I don't want an irresponsible use of my iPhone to end up causing some hearing loss in the long run. So, any ideas? I haven't been able to find anything.