Unverified85% confidenceFactTime unknown

NRR（美标）与SNR（欧标）不能直接比较，实际降噪往往低于标称值：实际有效降噪约为(NRR-7)/2，即NRR33dB实际约衰减13dB

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助眠耳塞category

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Unverified欧标SNR值通常比美标NRR高约3-5dB，两者不能直接比较；实际降噪效果需将NRR减去7再除以2估算真实值（NRR 33约等于实际降噪13dB）91% similar Unverified美标NRR与欧标SNR不能直接比较，实际降噪值约等于(NRR-7)/2，标注NRR33的耳塞真实衰减约13dB，选购时按此折算而非看标称最大值87% similar

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