Unverified90% confidenceFactTime unknown
射击/装修/割草等85dB以上环境需NRR≥25dB耳罩，且实际衰减约为(NRR-7)/2，即NRR30实际降噪约11-12dB，评估时需打折
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UnverifiedNRR值不能直接等同于实际降噪量，实测降噪约为(NRR-7)/2 dB。NRR33的耳塞实际约衰减13dB，选购时看NRR≥30才能应对80dB以上环境（如地铁、割草机）84% similarUnverifiedNRR值需减去7再除以2估算实际降噪效果（如NRR33实际约13dB），且需完全塞入耳道才能达标，插入不到位降噪衰减可达10dB以上82% similarUnverifiedNRR降噪值需除以2再从环境分贝中减去才是真实衰减，例如NRR33的耳塞在90dB环境下实际降到约73dB，选购时不要被标称值误导81% similarUnverifiedNRR值需换算实际降噪：美标NRR减去7再除以2约等于日常真实降噪量，标称NRR33dB实际约13dB，不要迷信标称数字81% similar
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