Unverified85% confidenceDecision RuleTime unknown
主动降噪深度看降噪量（dB）而非频段数：地铁通勤选宽频降噪≥40dB的头戴款，机舱低频噪声集中在100-500Hz，此频段降噪≥25dB才有明显效果
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Unverified主动降噪深度看降噪量(dB)与频段：优质ANC可达40-50dB且覆盖到1000Hz以上中频，通勤地铁飞机场景需要中低频压制能力强的机型89% similarUnverified通勤/地铁降噪需主动降噪深度≥35dB，办公室场景25-30dB即可；仅标注'ANC降噪'而无dB数值的多为轻度降噪，实测对低频人声抑制有限88% similarUnverified降噪深度看有效频段而非峰值dB：主动降噪对100-1000Hz的低频轰鸣（飞机/地铁）效果最好，宣传的'40dB以上'通常指某个单点频率，全频段消噪量达到25-30dB已属旗舰水准87% similarUnverified降噪深度看dB衰减，主动降噪≥40dB才适合飞机/高铁的低频轰鸣；地铁通勤35dB左右即可，商务办公室场景更应关注对人声(中高频)的处理而非单纯堆低频降噪87% similar
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