Unverified88% confidenceDecision RuleTime unknown

长途飞行/地铁通勤选主动降噪(ANC)机型时，看降噪深度参数≥40dB才能有效压制发动机低频轰鸣，单纯被动隔音的入耳式最多衰减25-30dB且对低频无能为力

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Unverified主动降噪深度看被动隔音+ANC协同，实测低频降噪量≥30dB(1kHz以下)才能有效压制地铁/飞机引擎噪音；仅标称'降噪35dB'不等于全频段，需看是否覆盖100-1000Hz中低频93% similar Unverified主动降噪(ANC)深度≥40dB才能有效压制飞机/地铁的低频轰鸣声，长途飞行/通勤优先选头戴式；入耳式ANC通常在25-35dB区间91% similar

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