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Unverified87% confidenceDecision RuleTime unknown

标称频响范围必须看正负偏差，无标注±3dB的频响数字（如"20Hz-20kHz"）参考价值极低；真正评价低频看-3dB或-6dB下限频率

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Unverified频响标注要看正负偏差范围（如±3dB），只写40Hz-20kHz不写dB容差的参数没有参考意义；中场应做到低频延伸≤40Hz(±3dB)才体现相对近场的优势91% similar Unverified监听音箱频响标称应看±dB容差而非频率范围数字，专业级标准是±3dB内覆盖50Hz-20kHz，±2dB以内属高精度，仅标'40Hz-20kHz'不给容差的参数无参考价值87% similar Unverified低频下潜频率看厂商标注的-3dB下限，标称50Hz以下才算有真低频；很多小音箱标100Hz起，重低音其实是靠箱体共振和EQ拉起的假低音85% similar Unverified检测仪本底噪声（无信号时的基础读数）应尽量低，优质仪器工频磁场本底可低至0.01μT；本底越高越无法分辨真实弱场，购买前可查规格中的最小分辨率指标80% similar Unverified选低频陷阱应索要NRC（降噪系数）或按频段的吸声系数曲线，只标NRC一个总值无法反映低频性能；合格低频陷阱应提供125Hz/250Hz的独立吸声系数≥0.579% similar

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