Superseded85% confidenceDecision RuleTime unknown
主动降噪深度达到40dB以上才能有效压制地铁/飞机的低频轰鸣，25-30dB级别仅适合办公室人声环境
1
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85%
Confidence
Long-term
Relevance
-
First Seen
This knowledge claim has been superseded by newer content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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