I have developed tinnitus as a result of a “training incident” that took place at a new place place of employment on 13th May. I've posted full details in my 'Introduce Yourself' thread, so I won't give full details here. In short, I was being shown an alarm lock up/unlock procedure by a senior member of staff at my work and they did it in an unnecessarily stupid way, and I've had tinnitus since (13 days now). I reported the incident to the organisation they brought in an engineer, and they say he recorded the db level of the alarm at 98 (and therefore safe in their eyes), though they don’t say at what distance (I was a foot from the alarm). Anyway, since the incident I’ve been feeling very anxious about the long-term implications and have been reading a lot about tinnitus and exposure to loud sounds. I’ve read about "constructive interference" which describes how sound waves interact when reverberating around a space. It relates to when two sound waves of the same amplitude meet, meaning they combine and their sums are added together (e.g. the sound will get louder). The training took place in a small enclosed space with flat walls and windows, and I can't help but think this phenomenon could very easily have occurred over the course of 1 minute (the duration of the incident). However I don't really know what this ACTUALLY means in terms of dB level. Is it simply that they combine and it becomes 2 x 98 dB, or is there some kind of magical logarithmic relationship that comes into play? I've tried Googling, but that mainly gives me equations and graphs, whereas I want SOUND WAVES FOR DUMMIES type stuff. Does anyone know?