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When I first started out I put the whistle in one corner of my mouth. That lasted a day or two, and 15 years later there is still a difference in my hearing from left to right.
I have tinnitus from a variety of sources, one being the whistles I use. Something about the frequency that rattles my brain every time I make a call. (And yes, it explains a lot.)
I began using foam ear plugs very soon after and the situation stabilized, but I couldn't hear the coaches or players. Two years ago I went to an audiologist and got professionally fitted plugs used by musicians. They're great, and I can hear everything.
etymotic.com is what I use. I like officiating, but I'm not going deaf for it.
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