Unverified85% confidenceDecision RuleTime unknown

测量低频噪音（如空调外机、地铁、变压器嗡嗡声）需选带A/C双计权切换且频率下限≤20Hz的机型，只有A计权的普通分贝仪会低估低频噪音的实际影响

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振动噪音检测仪category

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Unverified音量调节应选无级/多档（≥10档）机型，掩蔽环境噪音需要的音量往往在50-70dB区间，只有高低两档的机型常出现'低了没用高了太吵'84% similar 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83% similar

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