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That’s not quite how the calculation for NRR is performed. The final step is to subtract the 9 dB from the original NRR rating. 16 dB is the actual reduction.

Dr. Nagler, I've had tinnitus in one ear since January 2016. I suspect it was from using a firearm without ear protection. After an initial period of great difficulty, I had come to terms with it and largely habituated. I have been careful to avoid exposure to loud noises. Much of the time...