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飞机/高铁降噪优先NRR 20-25dB即可，过高NRR会导致耳压不适且屏蔽舱内广播，泡棉搓细回弹的膨胀式最佳

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Unverified飞机/高铁降噪选带气压平衡阀的降噪耳塞(如ISOtunes/Loop系列)，NRR 20-25即可，过高降噪反而听不到广播且起降时耳压不适89% similar Unverified配套降噪耳机选主动降噪深度≥25dB的机型才能有效压制飞机引擎低频噪音（100-300Hz），普通被动隔音耳塞在飞机上几乎无效84% similar Unverified主动降噪深度≥40dB且支持前馈+反馈双馈降噪的耳机，才能有效压制飞机客舱80-85dB的低频轰鸣；单馈降噪或深度＜30dB的机型在飞行场景基本无感84% similar Unverified主动降噪深度看低频（100-300Hz）衰减量，旗舰头戴式可达40-45dB，能有效压制飞机/地铁引擎轰鸣；入耳式受结构限制通常在25-35dB83% similar Unverified主动降噪深度看低频衰减，头戴式旗舰可达40-45dB，能有效压制飞机引擎、地铁的低频轰鸣；入耳式TWS通常25-35dB，对突发人声和高频噪音效果有限82% similar

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