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机械风扇发声款（如Marpac/Yogasleep Dohm）无法调音效种类和音量数字化，只能靠旋转外壳开口调节，追求多音效或精准音量控制不建议买机械款

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白噪音机category

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Unverified选真机械风扇型（如Marpac/Yogasleep Dohm）而非数字循环型：机械发声无循环缝隙、频谱更自然，对声音敏感者遮蔽效果更好；但机械型无法调音色、无定时、体积大不便携86% similar UnverifiedMarpac Dohm（现Yogasleep Dohm）是机械式风扇发声的经典款，靠内置真实小风扇产生自然气流声，只有开关和双速档位，无电子音效但风声最真实，为纯插电款不便携76% similar Partially Verified发声原理是真实风扇机械转动，而非数字音频播放，音色自然但只有风声一种，无法切换其他音效（雨声、白噪音等）75% similar Unverified追求Hi-Fi音质的用户不建议购买主打冥想音效的专用音箱，其功放和单元针对白噪音优化，播放音乐时解析力和动态远不如同价位普通音箱75% similar Unverified音效为电子合成声而非真实录音循环，优点是无循环接缝/断点感，但部分用户认为不如机械风扇声自然74% similar

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