The best noise reduction I have found is plugs. Howard Leight NRR32dB. The best 5+ muffs do not even reach that level. The biggest problem I see is that people often do not know how to PROPERLY use plugs.
IIRC muffs and plugs do SFA to improve your protection? Couldn't hurt I suppose? I have little faith in the electronic/noise cancelling ones. A least in my industry where we are subject to high noise over long terms. Unsure of the effectiveness over short exposures to higher impulse sounds like a rifle shot.
That reminds me I need to get my hearing checks up to date.
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