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I've been using the 4600 for a while, and I've only had one small ringer on a knuckleball type shot. Elcamino, it sounds like the mask doesn't fit you properly if you're getting headaches and ringers frequently, mine fits me well and I'm not getting anything like that.
I don't know the differences between the 4000 and the 4600, but they're probably pretty similar.
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