Superseded85% confidenceDecision RuleTime unknown
主动降噪深度≥40dB可覆盖地铁/飞机低频噪音，但通勤日常25-30dB已足够，过度追求深度降噪会带来耳压感
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This knowledge claim has been superseded by newer content
地铁/飞机通勤选主动降噪深度≥40dB的入耳式，能有效压制100-500Hz低频轰鸣；开放式/半入耳无论宣传如何都无法降低低频噪音Sources
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