Unverified85% confidenceFactTime unknown

NRR（美标）与SNR（欧标）不可直接比较，实际隔音效果约为标称值减去7dB（OSHA修正法），标称NRR33实际约26dB

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UnverifiedNRR和SNR不能直接换算，欧标SNR通常比美标NRR高约3-6dB，跨标准比较时应统一换算：实际有效衰减≈(NRR-7)/284% similar UnverifiedNRR和SNR是两套标准，SNR（欧标）通常比NRR（美标）数值高3-4，SNR37约等于NRR33，跨标准对比时需换算81% similar

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